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does anyone know the flywheel bolt size for a kawa FH 721 v. I can't find it in any documentation.

M12 x 30 mm most likely a 1.50 mm pitch. Hex size 19mm. If flange hex head then 18mm; unless, it is a JIS flange head then it is 17mm.

Wish you asked before I finish the engine here but I am not about to take it back a part just to fine out an exact bolt size.

Thank you very much !!!