first timer! 15hp.force carb flooding?

boatfloat

Cadet
Joined
Feb 16, 2009
Messages
10
i bought a 15 hp. force(1989). the plugs keep floodind. i put in new float and needle. it starts a little,(sometimes),but gas comes out front of carb when priming, and plugs constantly get soaked. this motor was used 2 weeks in 1989,then stored till last year.when the original owner tried to start it, it would'nt run. after they tried a few off the wall garages,mower-repair-shops,etc. they gave up. i dont know what they did to it,(adjusted timing?) (point-gap?) it's a shame,because it look's beautiful,like new. has bright spark and 125psi. thank's for reading guy's.
 
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fishrdan

Admiral
Joined
Jan 25, 2008
Messages
6,989
Re: first timer! 15hp.force carb flooding?

I have an 88 7.5HP Force (Sears Gamefisher) which is the same thing as your 15HP, just a de-tuned version. Sounds to me like there's a problem with the needle/seat, float height adjustment or a cracked/flooded float. I'd double check the float height adjustment. I have a factory Force manual for 9.9 and 15HP, 1988-1992 and here's what it says for the float adjustment;

With the carb upside down, adjust the float height until it's parallel (or even) with the carb's body. Flip the carb back up right in it's normal position and adjust the float drop to 5/16", this is measured from the carb's base (rim next to the bowl gasket) to the top edge of the float, measured at the side of the float opposite the needle/seat. With the float adjusted you should be able to blow into the carbs fuel connection, raise the float and it will stop the air, drop the float and air will pass.

With an outboard of that age that's been sitting I would replace the fuel pump diaphragm (fuel pump kit $3-5) and also check the primer bulb for cracks and deterioration. I wouldn't worry about changing points/condenser in your outboard as it has electronic ignition BIM's (coil packs) If one of those goes out your hosed as they are NLA, $150 ignition system upgrade needed :mad:

Hopefully,,, The guys who worked on it previously didn't mess up the carb and throttle adjustments. FYI, Don't rev the engine by the carb's throttle lever (hopefully the others that have worked on it haven't done that either) as it can bend the reeds,,, Don't ask how I know...
 

Jester580

Recruit
Joined
Mar 23, 2009
Messages
4
Re: first timer! 15hp.force carb flooding?

Hey Fishrdan - what repair manual do you have? I have the 1989 Force/GameFisher 15hp motor and I can't seem to find a service manual for this thing. Who wrote it?
 
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