TYGA 300cc Bigbore Top End Rebuild Kit

The kit includes all piston assy and gasket parts to rebuild one cylinder on your NSR300. For complete overhaul to both cylinders, please order two kits.

Please see option below and let us nog in the comment box (at check out) what you need.

Short Skirt (default):
The short skirt type piston is a ‘bolt on’ solution for the big bore kit. In this case we modify the piston by shortening the front side skirt to allow clearance from the crankcase at BDC. Therefore, no crankcase disassembly or modification is necessary, and the top end can be assembled in the usual way of doing a top end overhaul.

Full Skirt:
The full skirt type piston has a very slightly increased longevity compared to the short skirt type, however, this necessitates that the crankcase is completely disassembled, and some grinding of the crankcase is required to allow for piston clearance from the case at BDC. Please see the guide for how to perform the necessary modifications.