1992 Johnson 8hp will not idle

kenww

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Jun 26, 2011
Messages
14
I have a 1992 Johnson 8 hp that will not idle. It sounds like it runs out of gas. I have put a new fuel pump and carb kit in. new tank and hose. I set the air seat at 2 1/2 turns. If I pull the choke out when it starts to die it picks up again. Help!!!
Ken
 

Monte1961

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May 8, 2011
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1,180
Re: 1992 Johnson 8hp will not idle

Ok but have you readjusted and fine tuned low speed jet yet? It's probably running to rich? Post back results.
 

kenww

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Jun 26, 2011
Messages
14
Re: 1992 Johnson 8hp will not idle

I didn't think it had more then one jet
 

Monte1961

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May 8, 2011
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1,180
Re: 1992 Johnson 8hp will not idle

8 hp carb.jpg Look at item # 15 Low speed jet
 

kenww

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Jun 26, 2011
Messages
14
Re: 1992 Johnson 8hp will not idle

That's the same one that i seated and then backed off 2 1/2 turns
 

Monte1961

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May 8, 2011
Messages
1,180
Re: 1992 Johnson 8hp will not idle

Ok that 2.5 turns is just for starters, it isn,t properly tuned yet. Start motor and allow to warm. Now working between Idle screw and item # 15 low speed jet, Work between them to get the lowest maximum rpms you can get! Now turn item Item # 15 out 1/4 to 1/2 and leave it alone. Restart motor if you have to and set idle screw to recommended rpm in gear. Post back results.
 

kenww

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Jun 26, 2011
Messages
14
Re: 1992 Johnson 8hp will not idle

I found a crack in the float bowl. thanks for the help. Ken:)
 
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