5 1/2 hp Johnson 1953, Bucking on me

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Trekspyder

Cadet
Joined
Apr 6, 2006
Messages
8
I had the motor at full throttle for about 5 min. then it just started to cut in and out, it will rev up then all the way down then rev back up again and it will continue to do this until I take it below half throttle. <br /><br />If you shut it down for 2 min then start it again it will run full throttle for 5 more min before acting up again.<br /><br />Where should I start with this one?<br />Thanks guys for all your help you have been great so far.
 
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Paul Moir

Admiral
Joined
Nov 5, 2002
Messages
6,847
Re: 5 1/2 hp Johnson 1953, Bucking on me

Sounds like it's overheating. When was the cooling system last serviced?<br />Unless the power changes were really sudden, like it was suddenly hitting 'turbo'. If that's the case, then look to the ignition system. If the ignition system is healthy, it'll produce sparks 3/8" or longer.
 
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Trekspyder

Cadet
Joined
Apr 6, 2006
Messages
8
Re: 5 1/2 hp Johnson 1953, Bucking on me

I thought it might be overheating too. No big turbo surges. As far as I know the cooling system has never been serviced. It seems to be peeing some amount of water? (not sure what a good amount should be) What should I consider servicing in the cooling system?<br /><br />I've got good tank pressure.<br /><br />Thanks guys.
 
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