Quality cast iron kit
"Quality casting with good ports. Equally the quality of a genuine cylinder. Porting is mid way tuned between fs1e and Fizz 5 speed. Nice kit with a bit more drivability for otherwise standard bikes" Trev - Friday, June 26, 2026
Product Description
43mm cast iron big bore cylinder kit for Yamaha FS1/FS1E.
High quality big bore kit, nice casting with large transfer and exhaust ports, made by the same factory as the original big bores avallible in the late 80's
This kit isn't the cheap Chinese one with the horrible small ports.
Comes complete with gasket top set.
