Piston to Deck Clearance??

[Dannyh82]

Does anybody know the Piston to Deck Clearance for the heiden tuning big bore kit with Wiseco pistons or the standard piston to deck clearance?

 

[650Skull]

they will all be different depending on their Ratio's Standard varies between years from is 8.7:1, down to 8.1:1, (Yamaha removed 1.5 mm from the piston crown to reduce the compression ratio for the XS1B) then gradually back up to 8.7:1, Think the mikesXs750 kit is over 9 and wiseco's over 10.

Need to do the squelch/squish test..........i don't have that thread linked. Maybe a search will find it.

 

[650Skull]

https://www.xs650.com/threads/flattrack-racer-build.31898/page-5#post-408339

 

[jay760]

This is too close, just kissing the very edge