1980ish 7.5 johnson

95hd

Recruit
Joined
Jul 1, 2019
Messages
5
Hi I am having trouble with a 1980ish 7.5hp johnson. The motor runs fine in gear with the cover off. With the cover on the motor runs fine at idle but with not come up to speed in gear and it seems to be missing. In neutral it seems to rev up normal. It doesn't appear like the cover is pinching a gas line or causing problems with the throttle cable. The cover is fiberglass so I don't think a wire would be shorting out. Any ideas?
 

racerone

Supreme Mariner
Joined
Dec 28, 2013
Messages
36,048
Is this in a test tank ?----If yes , put a fan on it to blow exhaust away.
 

fireman57

Captain
Joined
Aug 24, 2004
Messages
3,811
Your cover could be pinching a plug wire. Seen it more than once. Or could be a bad base exhaust gasket.
 

95hd

Recruit
Joined
Jul 1, 2019
Messages
5
Plug wire not pinched but have read some other similar problems and the bad exhaust sounds like the problem. Thanks.
 
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