92 Gamefisher 15HP high speed issues

[Nissan Newbie]

We took it out yesterday and it was running great! It idles great and all seemed fine... That is till a boat passed us with flyng colors and I noticed he had a 15HP *** well. Since the motor runs great it has to be the high speed jet right? As a side note I just bought it and the guy took out the thermostat cause it was bad... Could that affect the performance that much? Thanks

 

[bentle]

Re: 92 Gamefisher 15HP high speed issues

What size prop. Do you have and do a compression and spark test on both cylinders. Post what you get.

 

[jerryjerry05]

Re: 92 Gamefisher 15HP high speed issues

Thermo not a problem.Jet not a problem.Same boat?Size and weight.
Do a compression.spark test.My neighbor ran for a year with one plug wire unhooked.Said the motor ran great.Quite a different motor after the plug was firing again.
The prop could be the problem.These don't have a tach so you need to figure out the rpm's at wot. Tiny Tach is a good item to have in your tool box.

 

[Nissan Newbie]

Re: 92 Gamefisher 15HP high speed issues

Thats what I dont get he had amuch larger aluminium v hull and I have a zodiac... I should be much lighter. The prop it has is aluminium 9 x 8.

 

[bentle]

Re: 92 Gamefisher 15HP high speed issues

Prop. sounds ok. Do a spark test on both cylinders and comp. test and post what you get. These motors will seem to run well on only one cylinder. I use my 15 gamefisher on my 19 ft Maxum and it pushes my boat around no problem. Used for trolling of course.

 

[Nissan Newbie]

Re: 92 Gamefisher 15HP high speed issues

Ok the compression was 124 and 125. Has great spark... But the 1 of the plugs was soaked with gas the other bone dry.

 

[Nissan Newbie]

Re: 92 Gamefisher 15HP high speed issues

The thread is being moved. Isnt gamefisher made by force?

 

[Nissan Newbie]

Re: 92 Gamefisher 15HP high speed issues

I got new plugs for it. Does anybody think that might fix it?

 

[mrcrabs]

Re: 92 Gamefisher 15HP high speed issues

9 x 8.

that would seem to be a draw back to speed, a 9p on a 15hp...depending on gear ratio....kind of points to a power prop to push a heavy boat, your outboard may have been setup as a kicker once upon a time, I would guess the other guy was running a 12p-13p