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Old 4th September 2016, 08:04 PM
Nick G's Avatar
Nick G Nick G is offline
Senior Member
Join Date: Nov 2012
Member of: Greyhound/ Purley Chase
Location: coventry
Posts: 180

Its not temperature related , I think the piston( brass) is chattering as it travels down the bore, and picking up. Any tightness saps power, I had too good a fit in the guide rod diameter and it cost in the region of .3 ft lb,
I have ordered a 19 mm spring, so a full piston will cure it , I have 22 23 and 24, set ups with full ally pistons with a rear bearing and don't have the issue with them.
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