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Doing A Quick Tune On Twin 40S


ke20 king

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Hey guys I just got my ke20 running lastnight it's a fresh motor big cam big head work done etc.

Now I got it started and it's running very lean and won't idle. Just wondering if anyone knows how to richen it up just temporary until it gets dynoed? Also when I rev it it takes awhile it get the revs back down is this because it's not timed or untuned?

 

Thanks,

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Any where between 8 and 20 degrees. Depending on the engine of course. But and I say BUT!!! If the engine runs with 60 degrees of advance at low rpm i'd dare say you cam timing is out by about 3 teeth.

 

Now considering most engines won't run an advance so far out at idle.... i'd say the cam is likely 1 tooth retarded and the distributor has been advanced to counter this.

 

This would also cause the engine to appear lean when in fact it could be rich.

Edited by GJM85
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