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Dukedesmo · 27-11-2019, 08:36 AM

High comp definitely an improvement with, IMO no downsides.

A word of warning though, be careful that supplied rings are compatible with Nikasil bores (chrome rings eat away the coating).

I have JE high comp (944cc) pistons in mine and have had a battle with bore wear, I think I've won said battle now but only after a couple of replates & new rings...

27-11-2019, 08:36 AM	#7
Dukedesmo Registered User Join Date: Sep 2010 Location: Leics Bike: M900 Posts: 2,842	High comp definitely an improvement with, IMO no downsides. A word of warning though, be careful that supplied rings are compatible with Nikasil bores (chrome rings eat away the coating). I have JE high comp (944cc) pistons in mine and have had a battle with bore wear, I think I've won said battle now but only after a couple of replates & new rings... __________________ M900, 916, LeMans II.