motor revs up and idles down

[Zebeanna]

Thanks for the help so far. I have replaced a very damaged ignition switch, the throttle and shift cable has been replaced. I replaced the rectifier, rebuilt the carbs and fuel pump, bought a new 12 gal tank and new lines and bulb, the power pack was changed, one coil is new. The compression was 150 on each cylinder. I have a 1976 55hp Johnson. It will not go higher then 3200 @ WOT and when it idles at times it sounds like it gets an intermittent burst of power. It does however start right up and idles @ 1000 rpms when I reduce that it just sputters and dies. Any suggestions, comments , remarks would be appreciated. thanks.

 

[jonesg]

Re: motor revs up and idles down

its probably running on the one good coil.

You need to spark gap test it, go to the auto store and get an adjustable , not a neon, spark gap tester. Set the gap to 7/16th inch and see if you have spark, all plugs out and grounded.
I think you'll find a coil kicking in and out.

Or a dirty carb starving a cylinder.
Did you rebuild the carbs yet? its very simple to do.

 

[tashasdaddy]

Re: motor revs up and idles down

or you did not get the high speed jets throughly clean.