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RE: New engine for Scruff

Posted by : Neil (82.33.210.228) Inappropriate or SPAM?
On Thursday 18/08/16 at 20:29:05

Hi Harry
I can't use a YX140 crank as they are designed for a secondary clutch engine, and I'm building another semi auto primary clutch engine, so that original Honda Cub90 outer engine covers can be used. So the crank needs to be primary clutch design with 57mm stroke and a 13mm small end bearing to suit a YX140 piston. This design of crank was used in things like the Thumpstar 124 which had a primary clutch longstroke engine of 52.4 x 57 and used a Cub90 stud pattern. I've ordered one and am desperately hoping it will fit the Lifan 125 bottom end.



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