90 hsp Johnson Outboard idle problem

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SethR

Recruit
Joined
Feb 26, 2005
Messages
2
Hello, I have a 90 hsp Johnson (mid 80'S). I recently put new throttle cables and a new starter on it. But now when I start it, it idles for awhile then starts to rev up, even when I DO NOTHING. Is this an easy fix? If so... How?
 
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Solittle

Fleet Admiral
Joined
Apr 28, 2002
Messages
7,518
Re: 90 hsp Johnson Outboard idle problem

Welcome Seth - Was it doing this before you worked on it?<br /><br />Suggest that you go to the main page & hop to the engine FAQ section. There are some great posts on troubleshooting.<br /><br />Do you have a shop manual?
 
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SethR

Recruit
Joined
Feb 26, 2005
Messages
2
Re: 90 hsp Johnson Outboard idle problem

Hello, thanks for the reply...<br />No it was not doing this before and Yes I do have a shop manual, (and you would think it would say something about this... huh). I don't know much about boat engines, but I know I don't want to blow the ****ing thing up! And thats what it sounds like after it idles for a moment. Any ideas?
 
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rodbolt

Supreme Mariner
Joined
Sep 1, 2003
Messages
20,066
Re: 90 hsp Johnson Outboard idle problem

hello<br /> double check the trunion is adjusted so when the control returned to the idle position the linkage is pulled back to the throttle stop. its the large screw with a spring and a nut that the screw comes to a bracket mounted on the block.
 
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ob

Admiral
Joined
Aug 16, 2002
Messages
6,992
Re: 90 hsp Johnson Outboard idle problem

I agree.If it was idling right before replacing cables ,somethings out of adjustment.Insure the carburetor/s linkage roller is on center and "just touching" the scribe line of the throttle cam when controls are in the neutral position.
 
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