1976 115 hp wont maintain throttle

[hd9linesman]

I bought a 115 hp 1976 , I an hoping it is a mixture problem but i read the most asked q's and i seem to be in the ball park. It says it can handle 50 to 1 and ive been doing about 40 to 1,,, My problem; it doesnt sustain throttle for more than a minute or two, it starts sputtering, if i hit the push button choke 3,4 times it will give my a burst. when i leave the launch it takes right off , within two minutes im struggling to keep it running.

 

[studlymandingo]

Re: 1976 115 hp wont maintain throttle

When you squeeze the primer bulb, does it get firm and stay that way? Sounds like a fuel problem. When it starts to get rough, squeeze the primer and see if it smooths out, if it does, you could have a fuel pump or line leak somewhere. Otherwise, it could be a dirty carb, compression issue, or otherwise. Start with the easy stuff, eliminate potentials as you go.

 

[hd9linesman]

Re: 1976 115 hp wont maintain throttle

well i know that if it dies sputtering it seems to need a squeeze to get restarted

 

[MercFan]

Re: 1976 115 hp wont maintain throttle

Squeeze the bulb while at full throttle and the motor is sputtering. If it takes off again it's fuel.<br /><br />Probably fuel pump diaphrams and check valves.<br /><br />Else the carbs.

 

[Clams Canino]

Re: 1976 115 hp wont maintain throttle

Agreed - and whatever it is - FIX it. Running lean will melt a piston for sure.<br /><br />-W

 

[hd9linesman]

Re: 1976 115 hp wont maintain throttle

thanx guys if it wasnt for this forum every time i saw the dentist i'd get a root canal