Bayfisher34 Posted March 27, 2018 Report Share Posted March 27, 2018 My new 140 Suzuki has about 8-10 hours on it and I have been following the break in process strictly. Whenever I got to the point where you can go full throttle for up to 5 minutes I noticed a problem. Anytime I am at full throttle it's almost like the motors power is going on and off on and off really quick and rapidly and the whole boat shutters too????? I can go pretty close to full throttle and still have normal operation, it only happens when I'm at full throttle. Can anybody tell me what might be wrong? Link to comment Share on other sites More sharing options...
justfish Posted March 27, 2018 Report Share Posted March 27, 2018 Those Lappys just aren’t designed for 4 stroke power Just kidding man. Hopefully you get it resolved quick. I’d be right back at the Zuke place if I was you Link to comment Share on other sites More sharing options...
Santiago Posted March 27, 2018 Report Share Posted March 27, 2018 What kind of gas did you put in? If you mixed no ethanol with ethanol gas you could get the problem you are describing Link to comment Share on other sites More sharing options...
ififish Posted March 27, 2018 Report Share Posted March 27, 2018 What rpm are you at? Hitting rev limiter? Link to comment Share on other sites More sharing options...
lurem Posted March 27, 2018 Report Share Posted March 27, 2018 If it is still being broke in then contact your dealer. You don't want to cause a worse situation by running it more. May be something simple. Report back what they find, inquiring minds.... Link to comment Share on other sites More sharing options...
justfish Posted March 27, 2018 Report Share Posted March 27, 2018 1 hour ago, ififish said: What rpm are you at? Hitting rev limiter? 👆🏼 I thought maybe that but wouldn’t think it would make boat shake Link to comment Share on other sites More sharing options...
FLDXT Posted March 27, 2018 Report Share Posted March 27, 2018 Is it acting like it isn't getting enough fuel wot? Or does it seem electrical, there is a difference. Link to comment Share on other sites More sharing options...
hawg Posted March 27, 2018 Report Share Posted March 27, 2018 I'm with Ififish. Sounds like you're hitting the rev limiter. Do you have a tachometer? Link to comment Share on other sites More sharing options...
Bayfisher34 Posted March 27, 2018 Author Report Share Posted March 27, 2018 4 hours ago, Santiago said: What kind of gas did you put in? If you mixed no ethanol with ethanol gas you could get the problem you are describing The boat came with about a half tank of gas and then I filled the tank up with ethanol fuel. The previous owner might have had no-ethanol fuel in the tank. After putting a new motor on I burned through half of what was then a full tank (possibly half ethanol half no-ethanol) when someone recommended harshly to use ethanol free. So then I topped it off with ethanol free the last 2 times I've gone out burning about a quarter tank or more each time. So that might have been the problem. If it was, will everything be ok when I burn through the small amount of ethanol fuel left in the mixture????? There couldn't have been very much of a mixture at all my last time out and it was still occurring the same as before. Link to comment Share on other sites More sharing options...
Bayfisher34 Posted March 27, 2018 Author Report Share Posted March 27, 2018 1 hour ago, hawg said: I'm with Ififish. Sounds like you're hitting the rev limiter. Do you have a tachometer? Yes I have one. Link to comment Share on other sites More sharing options...
hawg Posted March 27, 2018 Report Share Posted March 27, 2018 Check the Suzuki owners manual for the engine's maximum RPM rating. (I'd guess it's between 6000 and 6300) If your engine is exceeding that max rated rpm (over-rev)as you near full throttle, the engine will begin to stop firing on all cylinders in order to drop the RPM into an acceptable range in order to prevent engine damage. This will feel like a misfire and will correct itself as you reduce throttle into an acceptable range. If this over-rev is the problem, you will need to put a different prop with a higher pitch or bigger diameter on the engine in order to obtain near maximum RPM (without exceeding it) at full throttle. Link to comment Share on other sites More sharing options...
FLDXT Posted March 27, 2018 Report Share Posted March 27, 2018 I agree, Rev limiter or fuel restriction when the engine is asking for more fuel. We need to know what your rpms look like when it happens. Link to comment Share on other sites More sharing options...
captpn Posted March 27, 2018 Report Share Posted March 27, 2018 2 hours ago, Bayfisher34 said: Yes I have one. ha Link to comment Share on other sites More sharing options...
Flats Man Posted March 27, 2018 Report Share Posted March 27, 2018 Sounds like rev limiter to me too, but I was thinking going down on prop pitch?? Down on pitch increases torque and reduces RPM's at WOT right? Link to comment Share on other sites More sharing options...
Bayfisher34 Posted March 27, 2018 Author Report Share Posted March 27, 2018 2 hours ago, FLDXT said: I agree, Rev limiter or fuel restriction when the engine is asking for more fuel. We need to know what your rpms look like when it happens. I think it was around 5800, but I'm not really sure so I'll check in a couple days when I go back out on it. Link to comment Share on other sites More sharing options...
hurricane Posted March 27, 2018 Report Share Posted March 27, 2018 Mixing non ethanol and gas containing ethanol is fine. Link to comment Share on other sites More sharing options...
HoneyB Posted March 27, 2018 Report Share Posted March 27, 2018 7 minutes ago, hurricane said: Mixing non ethanol and gas containing ethanol is fine. Probably better to mix it away than continue to run ethanol blend Link to comment Share on other sites More sharing options...
hawg Posted March 27, 2018 Report Share Posted March 27, 2018 Flatsman, I think you've got it backwards. If you decrease the pitch, it frees up the engine (reduces the amount of effort required to turn the prop). Link to comment Share on other sites More sharing options...
hawg Posted March 28, 2018 Report Share Posted March 28, 2018 Bayfisher34. Two things occur to me: If you are near the Suzuki dealer, call and ask them if they can plug their diagnostic computer into your motor to determine if an over-rev(s) has been recorded. Also, most tachometers are made to work with different types of engines. There are normally small switches on the back of the tachometer which are used to "tune" the tachometer to the specific type of engine being monitored. If the switches are not properly set, the tachometer may not be giving an accurate RPM reading. Link to comment Share on other sites More sharing options...
OlivierHPS2300 Posted March 28, 2018 Report Share Posted March 28, 2018 Bring it back to dealer asap!!!!!!!!! Link to comment Share on other sites More sharing options...
polliwog Posted March 30, 2018 Report Share Posted March 30, 2018 Back to the dealer,or at least call . If you show 5800rpms at WOT you're not at rev limiter. Link to comment Share on other sites More sharing options...
BradM Posted March 30, 2018 Report Share Posted March 30, 2018 Almost sounds like a fuel deliver issue. Pumps, pick ups, filters good to go? No cracked or broken fuel lines allowing air in? Primer bulb in good shape? Link to comment Share on other sites More sharing options...
HewesYourDaddy Posted March 30, 2018 Report Share Posted March 30, 2018 On 3/27/2018 at 9:08 AM, Santiago said: What kind of gas did you put in? If you mixed no ethanol with ethanol gas you could get the problem you are describing That won't cause an issue at all. Just like mixing different octane rated gas won't cause an issue (unless the engine requires high octane only). Every person I know will mix ethanol/non ethanol at some point. Link to comment Share on other sites More sharing options...
Wanaflatsfish Posted March 30, 2018 Report Share Posted March 30, 2018 5 hours ago, BradM said: Almost sounds like a fuel deliver issue. Pumps, pick ups, filters good to go? No cracked or broken fuel lines allowing air in? Primer bulb in good shape? Yes, sounds like you could have an issue with the Anti-siphon valve on the tank...was this replaced...is the ball going flat at the higher RPM's? dc Link to comment Share on other sites More sharing options...
Bayfisher34 Posted April 16, 2018 Author Report Share Posted April 16, 2018 It ended up being the rev limiter and the wrong prop Link to comment Share on other sites More sharing options...
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