Author Topic: help with first port job on a poulan 4218avx  (Read 1106 times)

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Offline farmboy

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Re: help with first port job on a poulan 4218avx
« Reply #10 on: August 07, 2014, 04:51:51 pm »
Another tidbit: don't widen ports over 65% piston size.  Ex:40mm piston x .65= 26mm port width.  Open muffler outlet (no spark screen) to 85% ex. port (length x width x .85= size of outlet) using spark screen do 100% ex port.  This is general info not hard fast rules. 
Shep

 

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