9.9 Force Idles Great/ Stumbles Under Load??

[cwalls]

Thanks to all who have replied to other's 9.9 Force problems. The info provided has been very helpful in awakening mine (1988 92F88A) from a 10yr nap! The problem that I am experiencing is bogging down while trying to accelerate and plane my 14' Lowe Jon Boat. This motor starts and idles great. This is a list of things I have done so far:



-Carb Rebuild Kit/Clean with Carb Medic
-Fuel Pump Kit
-New Fuel Lines
-New Points and Plugs, Have good spark on both cylinders
-Impeller kit

I have the factory manual and used it for these items. Could it be fuel, ignition ...? Would the fuel recirulation system shown in the manual cause this type of problem? Almost ready to give up and go buy new motor! Any help would be greatly appreciated

 

[fishrdan]

Re: 9.9 Force Idles Great/ Stumbles Under Load??

Could be an air leak in the fuel supply hose or quick disconnect fittings.

I had the same problem with my 7.5 HP Force and found that it was a leaky quick disconnect fuel fitting. I never noticed the problem until I had the outboard in a test tank and priming the fuel, connector was leaking/dripping. If fuel can get out, then air can get in...