90 HP Force low RPM

[Jboogz]

Good morning! I am having trouble with my 90 hp force motor....at full throttle idle the RPMs only peak at 3000rpms...I let it sit at idle for 3000 for about 15 minutes before putting it in drive and going out. It was running smoothly for about 1000 yards then it stalled out. With the help of some starter fluid it would start but would die as soon as I put it in drive. Any help?

 

[jerryjerry05]

Re: 90 HP Force low RPM

Do a compression/spark test.
Ethanol is messing up a lot of motors.It's delaminating the inside of older hoses causing clogs in the carbs and fuel filter.Check for soft hoses and junk in the filter on the motor.Check the diaphram J

 

[Jboogz]

Re: 90 HP Force low RPM

Thanks I appreciate it.

 

[Frank Acampora]

Re: 90 HP Force low RPM

1. There is no full throttle idle. Fast idle is limited by an interlock and at 3000, you are getting more RPM than most.
2. Do not use starting fluid. It has no lubricant. Use a squirt bottle of fuel premix instead
3. Check the idle speed in forward gear in the water. It should be around 700-750. If not, first clean or change the plugs. If that does not help, then raise the idle speed with the idle stop screw on the tower.

Dirty, fouled plugs or too low an idle speed will cause these engines to stall when put in gear--it is what it is.

 

[olow]

Re: 90 HP Force low RPM

could be a bad diaphram in the fuel pump i have changed alot of these thru the years