Gamefisher 3.5hp spark plug and weird running

[flyingduck]

A little while ago, I picked up a GameFisher 3.5hp. (Don't know what year.) It ran great for the summer but is now exhbiting strange behavior.<br /><br />I pull the choke all of the way out and it starts fine. Then I push the choke all of the way back and it runs fine for a couple of minutes, then it starts to die. If I pull the choke back out, it will keep the motor running and I can slowly push the choke knob back in about 2/3 to 3/4 but if I put the choke in all of the way then it will surge and die.<br /><br />I figure it won't hurt to put a new spark plug in but am not sure what plug this motor uses. The model number on the motor is 642-31.<br /><br />Thanks in advance for any help.

 

[Paul Moir]

Re: Gamefisher 3.5hp spark plug and weird running

Welcome to Iboats, flyingduck!<br /><br />Try to find the serial/model number so we can get an exact year. The 642-31 is a Tecumseh number, which isn't unusual because the outboard company Eska bought Tecumseh engines, put them on their outboards, and sold them to Sears (Gamefisher name). <br /><br />I think the 642-31 was only used in 1980. If that's the case it ought to have a "Twist Grip" throttle. That engine uses Champion RJ13Y gapped at .030". RJ14YC might be a little easier to find, and "close enough" according to Champion (who can be dubious sometimes).<br /><br />If it won't run without the choke applied though, likely one of the small fuel passages in the carb is clogged - probably the idle enrichment passage. Best to take it apart, clean and rebuild it with a new kit.

 

[flyingduck]

Re: Gamefisher 3.5hp spark plug and weird running

Thanks for the plug info. I guess it must be a 1980 then because it does have the twist throttle on the tiller.<br /><br />Any hints on what's causing the weird running behavior?

 

[flyingduck]

Re: Gamefisher 3.5hp spark plug and weird running

Maybe I'll run some carb cleaner through it before taking it apart for a rebuild.

 

[crazy charlie]

Re: Gamefisher 3.5hp spark plug and weird running

Run Sea Foam in the fuel at a higher ratio than recommended and let it idle through for a while.Save some and after it is warmed up pour a little in the spark plug hole ,put the plug back in ,have a beer or two and then fire it up again.Charlie

 

[flyingduck]

Re: Gamefisher 3.5hp spark plug and weird running

Does Sea Foam come in a liquid form? I have an aerosol can that I use to clean out my RX-7 every now and then.

 

[crazy charlie]

Re: Gamefisher 3.5hp spark plug and weird running

Yes and it is easier to find than the aerosol.NAPA carries it.

 

[flyingduck]

Re: Gamefisher 3.5hp spark plug and weird running

I found some liquid Sea Foam today at my local auto parts store. The only remaining question is what brand of beer is best? <br /><br />Thanks for your help. I'll give it a go this weekend and report back.