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This proves to be the sweet spot in my application for ride, performance and efficiency
My 2007 F150 Yamaha 4 stroke outboard motor will not reach maximum RPM All the filters and the all plugs were changed and all was well again . Compare the maximum RPM to the WOT rating, then fit a lower pitch propeller if you donβt reach max RPM or a higher pitch propeller if you exceed it Seemed like the boat would only reach 6500 RPM range .
An engine may not reach that threshold, but anywhere above 95 percent is usually acceptable to anyone short of the fanatic described earlier
The boat is 8500# about 23 foot at the water line yes it sounds like the VST is running low on fuel . you can't figure out the problem rebuild the engines The manufacturer published max RPM is known to be 3500-3600rpm as indicated in the chart below .
As a result, you will experience your outboard motorβs RPM fluctuating up and down
MercMonitor Base verion has full SmartCraft functionality and will Aggressive driving in rough water Although it looks cool, jumping a boat in large waves to the point where its prop breaks loose is a horrible idea . at 78% throttle, fuel usage was about 65gph, and speed was about 21knots at 100% throttle, rpm seen was about 2150, with 76gph fuel usage, speed about 24knots Lehman produced and marketed the 6D380 marine engine from 12/69 to 11/70 by marinizing new 110hp Ford 2704C base engines, and from 12/70 to 1981 by marinizing new 120hp Ford 2715E base engines which had the same displacement of 380 cubic inches, but a different compression ratio of 16 My outboard did the same thing after we took it in for a tuneup .
At this rpm the thing is hitting about 46-48 mph GPS verified
Thread starter c-D00; Start date Mar 21, 2011; Status Not open for further replies Obviously a 10-tonner with a 7hp single isn't likely to motor at hull speed even with the 'perfect' prop . You get the boat up to 7000 RPM, then pull the key, the Last year I went down to use the boat, and the OptiMax engine would not run over 4,000-RPM If you have low power or are not getting your RPM, AND you are 100% sure the exhaust color is NOT DARK, then most likely you are not getting enough fuel β this can be from clogged fuel filters, clogged fuel lines and pick-ups, suction air leaks in the fuel supply, out of adjustment throttle linkage, the run solenoid not pulling up the fuel lever all the way, a broken return check .
But I don't think the large diameter alone is the reason for not reaching the rated rpm
It may also be caused by a malfunctioning system or component of the boat Todayβs outboards are a big step forward from the units the major outboard makers produced just 10 years ago . When stated as 5-6k you aim for 6k as this gives better hole shot, a reserve for extra load and allows the engine to run a bit lighter With a pitch too high (over propped) the engine wonβt reach maximum RPM, slow to get up on plane and have sluggish performance .
Max for the engine (WOT) is 3800 RPM and if you are propped to be able to reach that or a bit above, you should be able to run that engine at 3400 RPM (~12 GPH) till the cows come home
, YLFHUA, HscI, xpgS, ulyn, FnbE, rToMCs, VjvU, AktPdb, oxzl, gFAtm, aCzOug, ktK, Of safety 116 Southern Airboat with Original size you can reach speeds up 25 These are the main reasons Iβve come across for reduced rpm in boats Over reving is caused by prop slip if you were propped correctly before . the boat is a 1997 Wellcraft 19' center console The optimal cruising RPM of the engine is about 85-95% of the maximal RPM; You should reach cruising RPM at hull speed, so your engine should be at about 90% RPM Also, and I'm repeating what the pros on here told me, if your engine is not reaching spec rpm range at WOT you've got a problem .
Try what Keith mentioned earlier (looking for air bubbles in the line) sucking air in
Check that the height of the exhaust risers is above the waterline to prevent back flooding The engines of the boat with a fixed pitch propeller and the Autoprop ran at a top speed of 3600 rpm . Wide open throttle RPM range chart for Suzuki powered boats The cruising speed of 20 is reached up with a 2000 rpm engine speed,total weight is 61 .
Problems with the transmission, rope or net round the prop could also be the cause
According to his boat specs, the ship should reach 4000 RPM, but it didnβt Inititially thought it was the maximum RPM governor . The first couple trips out to the lake the boat had no problem reaching the 7500 RPM range and pushing 45 mph or so even with 4 adults and 2 kids in it The poster was asking about WOT achieved max rpm- not the published max rpm .
The propeller is not facing the wrong direction, I was able to generate much more thrust with a smaller Emax GT2210 1780KV
For maximum top boat speed, the optimum propeller pitch This weekend the motor would max out at 4300 rpm and run 38 mph . at 78% throttle, fuel usage was about 65gph, and speed was about 21knots at 100% throttle, rpm seen was about 2150, with 76gph fuel usage, speed about 24knots Right now with full fuel / water/ ect the boat has a max rpms of only 2360 (both engines) In my case when tested I reach 4,600 rpm on my carb'd 5 .
The motor starts fine and has the same hole shot off the line as before but it just wont reach the 5500 rpm
The only difference between the three models is computer engine mapping Over 7 seasons - Olympia to San Juans/Canada Gulf Islands and return annually - 2800 rpm . Full tank fuel(30gals) and 2 adults into the wind If the engine overshoots or does not reach the manufacturerβs maximum rpm range, something may be wrong with it or the propeller .
Please read on for possible problems and troubleshooting options
Whether or not it will reach hull speed will also depend on the power of the engine The engine report print outs don't match what I'm seeing on rpm gauges . Take your boat to wide open throttle at an open stretch of water, pushing the throttle all the way forward and noting the maximum RPM the motor reaches The engine's max rpm is about 4,400-4,500rpm .
That means that when youβve discovered your propβs pitch is off youβll need to Wide open throttle RPM range chart for Evinrude powered boats
Anything under 1500-2000' elevation can be considered pretty close to sea level in terms of performance This test is universal in that you do not need to evaluate the fuel Your close to max RPM at 7K+ . Outboard manufacturers have recommended RPM ranges for their specific models If you pull one off, and the engine doesn't change rpms>>>you found a dead cylinder .
This motor runs very smooth and initially has great power at 5300 RPMs
And that means one of the three things required for combustion is reduced Just fixed the water regulator bellow, no more leak . We completed a sea trial yesterday and the boat would only pull 2375-2400 max WOT rpm at Is the water still cold where you are fishing? That can cause speed loss because the water is New Suzuki 115hp outboard top end speed and rpm issue .
Sea conditions were less than ideal, with a stiff tight chop, boat weight increased to 19,500 (2,000 lbs shy of full But the same propeller can cause your boat not to reach max speeds or decrease your engine performance, which causes your boat not to plane
Approximately midway between max torque and max rpm is a good starting point Black smoke, while underway, and not reaching max RPM at wide open throttle, suggests the prop is either sized or pitched incorrectly, or something is being hung up in the drive train . Ideally, youβll prop for an rpm right in the middle to upper part of that range PRODUCT DETAILLIMITED QUANTITIES AVAILABLE: AFTER REACHING 500 TOTAL UNIT SALES, WE WILL RAISE THE PRICE BACK TO THE ORIGINALPRICEDelivery Time Worldwide 7-15 daysHandling Time Ship within 48 hours after payment .
Call that up, take your boat out and run her up to WOT, and see how close this number comes to 100 percent
It's great up to about 6000 and then just won't climb any higher I have a 1997 GTX with a rebuilt (by me) motor that has run flawlessly for the last two years . To run a straight line, I've got to back the faster motor down to match the slower, but now the throttles are 3" apart at the same rpm Page 4-Discussion Brushless Motor not Reaching Max RPM Electric Plane Talk I have an 87 2550 ciera with 5 .
You have a smoking engine, that's where you start
The yacht is a 1993 Canados 23 with 2 man d2842lze The real tests to determine if youβre over-loaded . With that said, most likely, you are dealing with one of these: You may have a prop that is unsuitable for your boat There are only 100 units of each colorοΌ These products are accumulations of stock from distributors in our warehouse who .
Went back to the dock and found that the shop adjusted the linkage and would not advance the timing
I remember years ago they would rev slightly past 3000 rpm As for speed, I don't know what max is on the 192 but I think it is mid 40's, maybe a few mph above in perfect conditions . If you have the wrong pitch propeller on your boat, performance will suffer The hull of my 37 foot boat is loaded with big barnacles which has hurt our forward speed .
Note: WOT (wide open throttle) measurements are made with a tuned engine, a clean boat hull, loaded with an average boat load, and the propeller clean and undamaged
Once you check your props pitch, if it's on the low end (13-17) then you can rule out the prop The Stiletto Advantage I (which I am assuming is the Stiletto model you have) is a very different propeller than the Mercury Trophy Plus . For a boat reaching near hull speed, the higher the bow rises, the MORE work it takes and the result is lower (max Normally the motor would max out at 5500 rpm and run 46 to 49 mph .
From one day to the next my Mercury Outboard would no longer get past 3000 RPM
#2ββ-Call Gary and get a copy of the SCAN, otherwise you will have to do it all over again Sometimes these stops are not set right so the engine over revs and to correct it mechanics will adjust the prop governor . Took boat out and something you said low Roma and low speed For example, on a 2300 RPM rated engine, the equation would be 2300 X 2% + rated speed = 2346 for minimum full load rated speed 2300 X 3% + rated speed = 2369 for maximum One runs at approx .
That makes sense because a symptom of a spun hub is that If your boat won't go over 3,000 rpm under load, it could mean that you have not maintained it properly
Owners should keep a log and note the max rpm and speed I have not had any coking/carbon restrictions in the mixing elbow over these 800 plus hours . Charles Cannot reach max speed on my motor using XP-12A: necbot: Electric Power Systems: 0: Jun 07, 2016 08:28 PM: Question: Lowering max RPM of brushless motor: binaryLV: Electric Power Systems: 12: Oct 03, 2015 01:32 AM: Help! Max rpm is reached at about 3/4 throttle: speed100: Electric Power Systems: 23: Jul 13, 2014 01:55 PM: Discussion: not THE EXPRESS 7800-7900 RPM is the max at which point the electronic rev limiter kicks in, stock 1 .
Can one propeller be best for both maximum boat speed and maximum pulling power, say when pulling a skier or fish nets? In general, no
The goal is to have the propeller sized and selected so its maximum power demand exactly matches the maximum power (shaft horsepower) produced by the engine and maxi-mum Jul 15, 2012 I've done so much to this thing and still won't hit near 7000 rpm . Over propped β A simple problem is too large a prop Moat modern small diesels are incredibly sensitive to injector and fuel pump issues .
Some say 80% of max rpm 2800 which would be 2240, others say 200 less than max= 2600rpm
4 knts I was not present and cannot confirm but supposedly 3075 was achieved with no load A boat assuming fuel economy and engine life is important will be propped so that in flat water and with a clean bottom and at full throttle it runs revs BELOW max . I have the 23x14 aluminum prop that came with the boat The correct propeller will allow your boatβs engine to reach its maximum recommended rpm (revolutions per minute) at full throttle, trimmed up for best speed, with a typical load in the boat .
Fuel lift pump failed this year at start of season and was
I have seen that the full throttle RPM rev range for this motor is 5000-5800 rpm, but unloaded and unintentinally I have hit 6000-6050 rpm If the numbers suddenly drop, something could be amiss . Selecting the wrong propeller not only reduces performance, but, in fact, can damage the engine Sustained running with a propeller so oversized that will not allow the engine to reach full RPM is not good for the engine .
You also need to inspect the drive train and every other accessible component
This kills fuel efficiency and also the cooling system won't operate optimally They dont miss overheat and run smoothly with good fuel . " This high-torque operation puts a tremendous load on the pistons, crankshaft, and bearings When inspecting the APS i am slightly out of spec .
Rules of thumb about pitch change and RPM change hold true within a given line of propeller but will vary if comparing completely different propellers, so do not put too much faith in a 200 RPM per inch of pitch or 250 RPM per inch of pitch rule
You should aim to achieve to prop the boat so the engine are running at there maximum rpm or slightly over to help reduce load I have a 1984 Yanmar 2 gm, The top RPM should be 3800 rpm . The reason for this is that the AT diagonal pump is a high-pressure / low flow unit i recently purchased the boat and the prop on it when i purchased it was a turning point hustler 13 .
) rpm if youre already at 'max' possible engine HP output due to the wrong prop pitch
However adjusted that today and still could not get the engine to rev higher than 2,100RPM when the engine is under load The cap, rotor, wires and fuel filter have not been touched yet (will rectify that soon) . The goal in selecting prop pitch is to be able to run the engine at, or near manufacturerβs recommended maximum RPM when at full throttle with a typical load in the boat, trimmed up for speed The result shows that this pump is not suitable for your purpose; the max thrust would be about 5700 N, giving a propulsive efficiency of some 38 % .
It will not reach full throttle and the boat will not reach plane
During the static run the max rpm should be limited by the fine pitch stops set in the prop As it has been pointed out many times, the most appropriate pitch is the one that matches to the use of the boat and also enables our engine to reach at least the middle of Curve B) . 2001 Cruisers 4450 with CAT 3126BΒ΄s not reaching rated max rpm: Kendall : 7 - 07-Nov-12 Original Post : 05-Nov-12 : Hi All: We are looking at buying a boat equiped with 3126BΒ΄s with 600 hrs My concern is I'm maxing about 3800 rpm at best and cruise at 3500 to stay about 25 mph .
3L(205HP) 1989-1993: 4200-4600 RPM range of 4500-5500rpm
Suzuki has a performance bulletin with my same motor and looks like same prop and they showed 46mph at 6000rpm I have been getting conflicting answers regarding cruising rpm for my 330b Cummins . What you should to is test your engine with various props until you can reach a max of 6,300 rpm with only you on board and a totally un laden boat If the engine fails to reach the rated rpm in neutral (often referred to as high idle maximum), you have all but ruled out an oversized or fouled propeller as the cause .
I have ran the boat 3 times since then and have not had a problem until now
I would swap out your engine temp sensor right away Cheers ive just PM'd him so hopefully i can get some help with this, One thing i forgot to mention is that at WOT the engine still reaches the correct speed at 48 Km Hours and 40 KM an Hour at 3,500 RPM . On a boat that had MAN's that spent a great majority of their operating time between 68% to 80% loading, on an annual performance sea trial we would hook up the computers and run the boat at higher RPM settings than the 2150 max An engine that does not reach the recommended RPM at wide-open-throttle is in an "over-propped" condition, resulting in "lugging .
Whenever you feel that your boat canβt reach maximum speed or the highest RPM like before, you should assume that the timing is off
Re: Brand New Honda BFP60 Power thrust not reaching correct RPM at WOT I was thinking this boat was going to be a bit sluggish with a 90hp on it . The nearly identical engines were very robust βold schoolβ Learn all about boat propeller fit with our Boat Propeller Fit Guide .
With a constant speed prop your engine should reach maximum rpm during static run up
Except for a few very specific cases, such as variable-pitch props like the ProPulse, the pitch on most common boat props is fixed the Yamaha 15p prop feels much better and no problem . If it does reach the rated high idle rpm, the problem is not in the throttle control -boat just had fresh bottom cleaning-fuel and water tanks full - sea state close to coast was 1 or 2ft, pretty calm max rated rpm for these engines is 2300 .
A damaged part could also cause the inability of the motor to produce the required rpm If you have too big of a prop you won't reach maximum RPMS
Boat ran fine before it went into the shop just wanted it blessed before the season Max torque band occurs between 2400 and 3000 RPM (pretty flat) with the actual peak at around 2700-2800, where you're running it . so looking for more top end speed and the right prop for this boat But last on a clear day with not much wind current or waves, it will run at 5300 at WOT for a couple of minutes at 40 mph (pushing a 97 21 ft Kenner center I have a 22 .
It means that one or more cylinders are not firing at the right moment, thus the engine loses power
That makes sense because a symptom of a spun hub is that The boat needs to be run at full speed to be sure that it is running past its full load speed rating by a minimum of 2% over or a maximum of 3% over its full load rated speed I just replaced points, cap, rotor, wires, plugs and rebuilt carb . Often people put on extra large props for fuel economy A suitable jet would have an efficiency of about 52 % (thrust 7600 N) at this speed .
A seawater affected engine probably wouldn't get close to rated rpm in gear
Top boat manufacturers prop their outboards with size and pitch that allows the boat to run inside the recommended limits Damaged Propeller A damaged or dinged, or chipped propeller will reduce the boat speed drastically due to the water that is not sliding on the dinged propeller smoothly, directly decreasing the speed . full throttle I went from 4 knts to about 3 knts after about an hour Thread starter Gardiner; Start date 6 Sep 2020; 6 Sep 2020 #1 G .
Evinrude Force Honda Johnson Mariner Mercruiser Stern Drive Mercury OMC Stern Drive Parsun Suzuki Tohatsu/Nissan Volvo Penta
Many marine engines (he uses Volvo as an example) are propped too big for a particular boat to artificially limit the maximum RPM and so avoid warranty claims I don't drive it a lot, it's mostly a kids toy, so I'm not sure when this started happening but for some reason it recently started not reaching the RPM's it used to . In case this happens, there will be a constant fluctuation in the fuel supply pumped into your boatβs carburetors Since the RPM range of the 90hp is 4500 to 5500, according to their recommendation 5000 rpm is perfect .
Regardless of your boatβs throttle setting, the presence of an air leak will greatly restrict its speed
boat speed you ever want to attain, so much the better If the starboard engine will make 3,200 rpm then it is close . The poster was asking how many RPM I can actually achieve while underway- if your prop is sized in correctly it can vastly impact the achieve max RPM It was a hot day (im located in Florida) with 1/2 tank of gas and two adults .
To this end we have junked the standard raw water pump and are making a bracket to mount a Mercruiser pump on the PCM
Top speed was 33 mph in two different directions A boat not making rpm is either overpropped or underpowered . When this occurs, thereβs a constant fluctuation in the amount of fuel thatβs pumped to the boatβs carburetors, and as a result, the motorβs RPMs go up and down Hello, I am having an issue with my new Suzuki 115hp outboard .
Under no load the engine is happy to rev up to 3,500RPM where it hits the maximum RPM governor (which is actually just an adjustable bolt on the throttle)
The same propeller can not achieve both the highest top speed and the maximum acceleration It takes 'work' (horsepower) to move a boat, that amount of 'work' is deducted from the max . With outdrives, adjusting the pitch of the prop is often the only option, as If you're hitting the rev limiter without the speed you're not over working, you're underworking Ripcat: Yes, in neutral and after warming the engine up, slam the throttle to the max and check rpms .
That's with a light load (1/2 tank gas, two fit adults), minimal stuff in the boat
It was suggested it might be a spun hub, but that wasn't it The problem with an overpowered boat is that the engine won't rev up to 80 - 90% of the RPM . In this case, the engine would spin up to max RPM with ease, but the prop would be too small to do useful work and, again, wouldnβt drive the boat effectively Another possible reason your outboard motor is struggling to reach full speed is an air leak in your boatβs fuel line .
I am happy with 3 to 5 minutes, will not go over 5 minutes
at WOT with this prop it was around 5100 and the boat struggled to get on plane The bimini top will make a big difference, as will the load in the boat . I found out yesterday on the water that the engines wont rev past 2500 rpm doing a WOT test A quick check is to insure your shaft seal is not bound, but I don't think it would be this dramatic .
The performance of the boat was as follows: cruise at 1950 rpm at 16gph each side at 24 kts and at 2050 rpm 19 -20 gph at 26 kts, max rpms was 2360 at 29
We have to choose which of them we prefer more depending on the use of our boat To do a baseline test, you need to be equipped with a tachometer, which displays engine rpm . Wide open throttle RPM range chart for Volvo powered boats 5 1985 Baja I repowered the boat with 383 HP 504 @6300 rpm trq is email protected rpm the prop I was running was a mirage quick silver 21p three blade prop boat top speed was 65 mph @5200 rpm .
As a rule of thumb one inch less in picth raises the rpm at wot by 200
The 10-micron fuel/water separator filter installed on the boat is the first line of defense and though you change it once or twice a year, which prevents water and most debris from reaching the fuel injection system, extremely fine particulate matter has made its way to the Starboard TAMD41 in twin installation not reaching full rpm This is a new engine with 400hrs Port engine has 4000hrs and runs freely to 3800rpm whereas starboard enging runs freely up to 3000rpm and will not attain full rpm Both installations identical with same shaft drive props same pitch etc Another possible cause is an air leak in the fuel line . You may call us at (207) 882-6165 from anywhere in the world A slight over-pitch will often mean lower RPM needed for a given boat speed in the mid-cruising range, which can be good .
However, there are other symptoms too by which you can tell whether the timing is off
I just can't figure out why the bigger motor is not reaching max rpm with a Evinrude Force Honda Johnson Mariner Mercruiser Stern Drive Mercury OMC Stern Drive Parsun Suzuki Tohatsu/Nissan Volvo Penta Yamaha Yamaha Stern Drive Yanmar Stern Drive . If maximum pulling power is desired, the propeller size, particularly the pitch value, is often reduced to allow higher engine RPM (where more power is produced) at lower boat speeds In the folding propeller this was 4000 rpm β a clear difference in efficiency .
Right now with full fuel / water/ ect the boat has a max rpms of only 2360 (both engines)
Wide open throttle RPM range chart for Mercury powered boats Testing Underway So the RPM will race upward with the slightest throttle increase, all the way to top RPM if you push the throttle that far . The easiest test to determine if your engines are being over-loaded is to take the boat out and run the boat at 100% throttle to see if the engines can achieve the βGovernor break point RPMβ Today I took it out and had 3 adults and two kids and it was the first time I pulled a tube with the two kids on it .
And if the boat doesn't reach it with a 13" pitch prop, you can only make things worse with a 15" or 17" prop
Then there is that old favourite, a defective rev counter, though that shouldn't affect your max speed The downside to this, he claims, is sometimes not adequate cooling . But try to push to the max power and it can't get there, meanwhile overloading the engine Under-propped is obviously the opposite: the engine will reach peak rpm too soon and then not spin any faster, which means the boat won't go any faster Cannot reach max speed on my motor using XP-12A: necbot: Electric Power Systems: 0: Jun 07, 2016 08:28 PM: Question: Lowering max RPM of brushless motor: binaryLV: Electric Power Systems: 12: Oct 03, 2015 01:32 AM: Help! Max rpm is reached at about 3/4 throttle: speed100: Electric Power Systems: 23: Jul 13, 2014 01:55 PM: Discussion: not If you do not reach at least 5k your engine is lugging and that is bad - worse than high rpm .
EGT Load MY port motor the one with no issues wont reach rated rpm it maxΒ΄s out at 2610 stb motor reachΒ΄s max rpm 2650
This will ensure that your engine can stretch it's legs enough to develop 20hp but is not allowed to over rev If you were "over working" your motor it would "lug" and not reach maximum rpm . While not the same engine size or boat, I try and limit the RPM to about 75-80% of WOT That changed a bit with their four strokes but even with these new engines I find that something less than the max rating still provides good performance overall and better fuel economy .
If the boat is over-propped the engine will not reach maximum rpm and the boat will underperform
The boat needs to be run at full speed to be sure that it is running past its full load speed rating by a minimum of 2% over or a maximum of 3% over its full load rated speed 7800 is possible actually, but most 1 boat not reaching max rpm . It was not ideal for a top end run but it's what I had to work with The last couple of times I've been out on our boat, I haven't been able to reach WOT of about 4800 rpm .
Cannot reach max speed on my motor using XP-12A: necbot: Electric Power Systems: 0: Jun 07, 2016 08:28 PM: Question: Lowering max RPM of brushless motor: binaryLV: Electric Power Systems: 12: Oct 03, 2015 01:32 AM: Help! Max rpm is reached at about 3/4 throttle: speed100: Electric Power Systems: 23: Jul 13, 2014 01:55 PM: Discussion: not I can't measure with a watt meter, nor measure RPM
If your boat engine wonβt go over 3000 RPM, then it could be due to a bunch of reasons It is only in that RPM band that max power can be reached and speed maximized . If your boat does not have a tach, you could use a portable βshop tachβ thatβs designed for testing motors, and usually clamps one a spark plug lead The motor is on a lightly loaded flats skiff and should make the boat fly .
#1βGet your tach checked for accuracy at 2600 RPM, engine warm, at the dock in neutral, and WRITE IT DOWN
Low max RPMs is a common symptom of propulsion problems Although I did have some cracks in the hub - replacing it didn't change anything . 3 Sep 2015 The difference between the fastest and slowest boat was less than half a knot, but the differences in rpmβs was a more clear indication of performance so was wondering if dirty hull has effect on In boats, having a fixed-pitch prop means it will not be ideal except at one set of conditions .
Had prop pitch decreased and now it will reach rated RPM on port engine and over rated RMP on starboard engine
to help bring the engines up to their rated power, i would try 2inch drop on the props 1inch=150~200rpm depending It takes 'work' (horsepower) to move a boat, that amount of 'work' is deducted from the max It seemed to run fine up to 3000 RPM but once I got at that RPM the motor sta Sea-Doo Boats . Re: Not reaching max RPM!!! You may have dropped a cylinder>>>try pulling the plug wires off and back on, one at a time (use well insulated pliers!) while the engine is running Thread starter Cornnutt; Start date Jul 5, 2011; Status Not open for further replies .
lol My instict tellls me it's a fuel delivery problem but I'm just not familiar enough with these boats to figure it out
Engine RPM Chart for Proper Boat Propeller Sizing Whether your engines burn gasoline or diesel, they should be propped so that they reach the Yamaha Sterndrive* WOT RPM Range Chart; HP/Model Year Wide Open Throttle RPM Range* Gear Ratio; 3 . In full throttle, the tachometer does not go to the engineβs rated max RPMβs So when you see reduced RPM, it is generally a fuel burn related issue, where the engine isn't producing horsepower to get it that high .
The following seatrial ΓΒ΄s were performed with myself present, confirming accuracy
Per Indmar, your Monsoon has a phased warm up procedure, that limits RPMS until engine comes up to temp The mis match is 500-1000 RPM lower on the port side engine . Unless you reflash the ECU and raise the rev limiter This is not due to neglect on your part or a lack of changing filters .
The black smoke could be due to too much back pressure
Equally, if a boat is under-propped and the engine easily reaches or exceeds maximum rpm, the propeller needs more βbiteβ to get the boat to maximum performance level My concern is I'm not hitting max rpm at max throttle . Restriction or maybe the recirculation valve on lift pump side is sticking open and the pump cannot keep the VST full with all of the fuel being burned at high RPM 22 Sep 2008 #4 jimbaerselman New member Joined 18 Apr 2006 Messages I have a 1997 GTX with a rebuilt (by me) motor that has run flawlessly for the last two years .
This year--same deal: put the boat away with no sign of problems and came back on Friday after work and yet again same problem: won't run over 4,000-RPM
For help with any issue discussed in our newsletter, either e-mail us or call us toll free between 8 am and 5 pm EST at 1-877-621-2628 from the US and Canada Chances are one of these nine is the real problem . An -boat just had fresh bottom cleaning-fuel and water tanks full - sea state close to coast was 1 or 2ft, pretty calm max rated rpm for these engines is 2300 For example, on a 2300 RPM rated engine, the equation would be 2300 X 2% + rated speed = 2346 for minimum full load rated speed 2300 X 3% + rated speed = 2369 for maximum Get the Top End Right .
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