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Hi wardogAs I wrote it will fit in the 644 the 23mm high pistons don't come up to the topYou have a 135 and a 134mm rod most are 135 and you have a 41 mm throw on the crankSame as an 80mm stroke crank (40mm throw) with 136mm rodThe issue is rather compression which will be highFwiw head volume in approximately 38cc you can figure the rest
Hi wardog
As I wrote it will fit in the 644 the 23mm high pistons don't come up to the top
You have a 135 and a 134mm rod most are 135 and you have a 41 mm throw on the crank
Same as an 80mm stroke crank (40mm throw) with 136mm rod
The issue is rather compression which will be high
Fwiw head volume in approximately 38cc you can figure the rest
