GX390 Valve springs

na2slow2

Member
I had a problem with motor cranking after a red flag. Anyone ever run .020 before coil bind ever experience that while engine was warm. Engine cooled down and starts fine. We tried jump box and rolling past compression stroke with no luck at the track. Im not gonna get a chance to work on it before next race day so I am gonna prepare for everything. I see where the recomendation is .060.
 

na2slow2

Member
Update, it was a bad compression release on the cam. Its mounting point for some reason is in a different spot then all my other cams so when it spun out it went past the forks, not sure how during practice it did not mess up. But when it cooled down it must have been releasing. Either way defective cam, just something to keep an eye out when building a new motor.
 
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