So been test assembling the engine today; M900 with 944cc JE high-comp pistons. After setting the piston ring end gaps to JE spec, I fitted the cylinders/heads to check the squish. I was looking for 1mm and have 3 thicknesses of base gaskets to play with; 0.3mm, 0.4mm and 1mm. Rear cylinder gives me 1mm squish with 0.4mm gaskets, whereas the front cylinder gives 0.9mm with the 0.4mm gasket. So now I need to decide whether to stick to 1mm, in which case I need to source a 0.5mm front gasket (or use a thicker gasket and machine base of barrel down) or go for 0.9mm all round, in which case I can use a 0.4mm on the front and 0.3mm on the rear. 0.9mm all round is definitely the easier option and I'm thinking that it should be OK, especially on a (relatively) low-revving engine? does anyone have any advice, piston to head interface horror stories etc?
0.9 will be spot o mke sure you have both pistons the right way round double check circlips find a 600 flywheel this sorts the retarding of the timing Steve B
Thanks, I was hoping 0.9 would be good, the 1mm was probably erring on the cautious side. Big valve cutout to intake clips are a swine to fit as they don't have a 'tang' like the Ducati clips. I have a Nichols lightweight flywheel so will retard via the pickups but I have an Ignitech programmable ignition so should be able to get what's required?