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Motor won’t go past 4000 rpms
- Thread starter Gary pope
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JeffGilbert
New Member
I'm also working on the 657x in the speedster I sold to a friend last year.
Exactly the same problem: one engine can't make it past 4000 in the water. It'll go higher out of the water, but stumbles and coughs like crazy. He just had all 4 carbs professionally rebuilt, but I'm unclear on if/how that changed the behavior. Mixture screws were both 1.5 turns open. Plugs don't show rich. I checked the neutral safety switch. Verified both cyls firing. He says compression is ok but I dont have the numbers
I'll have him swap carbs and see if the problem goes with the carbs or stays with the engine.
Anything I'm missing?
Exactly the same problem: one engine can't make it past 4000 in the water. It'll go higher out of the water, but stumbles and coughs like crazy. He just had all 4 carbs professionally rebuilt, but I'm unclear on if/how that changed the behavior. Mixture screws were both 1.5 turns open. Plugs don't show rich. I checked the neutral safety switch. Verified both cyls firing. He says compression is ok but I dont have the numbers
I'll have him swap carbs and see if the problem goes with the carbs or stays with the engine.
Anything I'm missing?
Mine is a 99 speedster does anyone know if I’d has the limp mode when overheating?
No, none of the 2-strokes except the fuel injected ones have limp mode, if it has a carburetor, no limp mode.
Look at the switches, lower right, it's amber. Is it flashing when the alarm is on????? If so, you're low on gas. Toggle it and the beep will stop. If the light isn't on toggle it any way the light might be bad. That is your reserve, time to get to the dock!
Just got a call from the shop , mechanic said he replaced the spark plugs and adjust the carbs so both rev equally in neutral to 2500 rpms according to books spec. I told him that I was having in issue with the one engine running low rpms but according to the work order it just said to get the boat runninganyhow he said to give it a shot . I went to pick up the boat after talking to the mechanic on the phone he decided to look into it a bit further , he told me that my charging sytstem wasn’t working , on both engines . He wasn’t sure why and didn’t why. He told me to take it home and check the stator for continuity and for amperage, if I’m getting both the problem is with my rectifiers. I having a problem with his diagnosis because I only had a problem with one engine not both , he said both were not charging .
Had it at the shop today , the mechanic said that he wasn’t getting any alarm while testing today. Strange !
So I tested the stator and rectifiers on both engines . The one engine I’m getting 20 plus volts coming from the stator and 14.8 volts outnof the rectifier. The other engine I’m getting 20 plus volts coming from the stator but only getting 4 volts from the rectifier. So I suspected the rectifier was bad! Not the case , I took the rectifier off the good charging system and put it on the one that was low and still getting 4 volts ! What can it possibly be
I checked the voltage
Coming from the engines . engines while in idle run around 20 plus volts ac the coming out the stator. one engine has 14.8 volts coming out of the rectifier/regulator and the other is reading only 4 so I automatically suspect the rectifier/ regulator was bad .I swapped rectifier with the other side and still only getting 4 volts .Checked the wires for continuity and not getting and O/l but not sure what they are all suppose to reading but no shorts to ground .what do you guys recommend I to go from here ?
How did you come to that conclusion, also what do you plan on doing ?
JeffGilbert
New Member
Follow up: He dialed in the mixture and says it runs fine now.
I’m thinking I may do the same , still trying to trace where I’m losing voltage
How did you
Find out it was the mpem?
Strange thing was it wasn’t on the engine that I had a problem with, so checked both sides !
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