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Author Topic: Redmax 621  (Read 8289 times)

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Offline EHP

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Re: Redmax 621
« Reply #20 on: August 01, 2015, 10:42:41 am »
the 621 takes well to porting just remember to port more for torque than rpms , its a cheap motor but you will be surprised at how much power you pick up , Donot go wild on porting as you can over port these jugs pretty quick . You want your max power at 10,500 or so , they are not a cookie cutter but once ported they sure will cut cookies or firewood for a long time
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