1975 70 hp johnson problem

OLJOCLARK

Cadet
Joined
Apr 5, 2010
Messages
27
Hello,Oljo here.Trying to get my project boat sea worthyby the 4th but it aint loolking good.Here's the deal.It cranks and runs and revs good sitting in the yard with the water ears,but every time I put it in the creek ,it spits and sputters,doesn't crank good,some times takes off good and sometimes it doesn't.The local mechanic, replaced some reeds and gaskets.It was spitting gas back out of the bottom carb when I carried it to him.I've cleaned and checked the carbs twice.They look good, I can see all 3 spraying when its running. I"m getting fire to all 3 plugs.Anyone had this problem before? Any ideas?
 

Bifflefan

Commander
Joined
May 27, 2009
Messages
2,933
Re: 1975 70 hp johnson problem

Are the carbs cleaned or rebuilt?
Did you check the spark with a spark box?
What is the compression?
Are the plugs good?

If you for sure want it done by the 4th, id take it in and have a tech do it. That way you know for sure and can run it at least once before then.
 
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