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Old 03-30-2015, 01:09 AM
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DRBS DRBS is offline
Motorized Bicycle Elite Member
Join Date: Jun 2014
Location: Westland MI U.S.A
Posts: 265
Default Re: what did you do to your motorized bicycle today?

1 13mm from bottom ring 7/32" two then continue to drill two holes then two more below them stopping 3mm from bottom of piston so in all 6 holes you also need to make room in intake port for the top reed to work. you need to take off a little bit about 1mm. they really do make a difference while going up hill or against the wind. check this page out there is a lot of good info here I did change the hole pattern to two by two seems to work better I know I went through 3 pistons to get it right!!!

Last edited by DRBS; 03-30-2015 at 01:17 AM. Reason: add info
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