1989 20 hp johnson intermittent reving on acceleration (i.e. vroom,vroom,vroom....)

durwoodb

Recruit
Joined
Jul 13, 2010
Messages
1
This is a 20 hp johnson manual start. When acceleratintg it sometimes just revs-dies-revs-dies-revs-dies......(sounds like vroom, vroom, vroom) Usually shutting it down and restarting it solves the problem and it runs normal. This happens intermittently - probably every 10th time I start it. It has been occuring for over a year.

I rebuilt the fuel pump, swapped tanks, swapped fuel lines, etc. No change.

I am now thinking ignition or thermostat malfunction. Any ideas?
 

fireman57

Captain
Joined
Aug 24, 2004
Messages
3,811
Re: 1989 20 hp johnson intermittent reving on acceleration (i.e. vroom,vroom,vroom...

have you cleaned/rebuilt your carb. Sounds like you have a piece of junk in one of the jets.
 
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