What's the bore new CMB 21RS.Need head button.

[153stars]

What's the bore new CMB 21RS. Need head button to adapt buggy motor. I bought the red 21RS cooling head.The green head & button would of been right if they all had the same bore. Now I have the carb, collet , header and a red flywheel coming.I might need a custom one made up, who does them. If the bore is the same I'm good ,larger bore I can get it turned down local.The new RS ones must be taller to mate the under side of the cooling head.

Too many more snags and I'll run it in a buggy.

 

[Stuart Barr]

Bore for the 21RS is .643" or 16.3mm. I have these in stock for $23.00.

Stu Barr