rapido225

[philcasino1973]

hi does anyone know the recommended squish setting for a rapido 225; was no headgasket when i stripped it seems quite a bit of compression squish is 1.05 at moment after rebuild thanks phil.

[dickie]

1.05mm good in general. It depends on how good your big and little end bearings are really. Plus crank deflection and main bearings. I have no idea which of these are more significant. Peak rpm is also important in this as it determines piston acceleration at TDC. I'd measure the compressed volume, then calculate geometric and corrected compression ratios rather than just relying on squish as it also depends largely on what, if anything has been done to the head.

Is it race or classic rapido? The reason I ask is that the race version has higher exhaust duration so should be easier to kick over.

If

[hullygully]

D.T. recommends 1.1mm to 1.5mm with a 58mm stroke crank