***NOW FITS THE GSR40 ENGINE!***
Billet girdle head shell for Chung Yang 46cc engines(same as GP460RS) and the GSR40 engine. Girdle design relieves stress on bottom of cylinder by bolting the head down thru the cylinder into the cases. CY46 cylinder should be machined to 2.355 inches tall from the base and the diameter to fit into the head shell is 1.955 inches. Includes 5x80mm mounting allen bolts and washers.
Please note, we do not have installation instructions on how to install a head kit or how to machine the cylinder. If you are unsure how to use or install this product, then this is not something you should attempt to do without help from someone with experience. This is not a simple bolt on mod, engine building experience is required.