Author Topic: Redmax 621  (Read 8189 times)

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Offline Chris-PA

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Re: Redmax 621
« Reply #30 on: August 02, 2015, 10:59:05 am »
The timing on my clone was decent as it came, except for the intake.  I removed the gasket and lowered and widened the intake.  The timing (duration) ended up at:

E 160
I  159
T 122  (Blowdown at 19)

I left the exhaust port alone, and the final widths were:  Exhaust port = 54% of bore, Intake = 52%

It seems quite willing to rev, and I suspect the smallish carb is holding it back some.  It's got a very usable power band. 

 

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