Johnson 70 1986 WOT problems......

leopoldoben

Cadet
Joined
Aug 21, 2011
Messages
14
1986 Johnson 70.......intermittent RPM's...starts fine and then cuts out at WOT, other times after running gallons through it...sometimes even at start up it bogs from the get go!....there is rhythm to it..varies ..... new plugs...rebult carbs.....drained fuel tank.....HELP!........now I am thinking ignition..HELP ignition guys..could it be one of the coils? plug to coil wires look good.....what about temp gauge?...it sounds like it is losing spark to one cylinder and then getting it back if that make sense..HELP again!
 

Daviet

Fleet Admiral
Joined
Sep 24, 2008
Messages
8,958
Re: Johnson 70 1986 WOT problems......

A couple of things to try.
Use an inductive timing light and check all plug wires for spark when it boggs down.
Use a squirt bottle with fuel mixture in it and squirt fuel into each carb when it boggs down.
This should tell you if you have a fuel or ignition problem, compression is OK isn't it?
 
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