Zumasrus

Cylinder Kit 12mm Big Bore Athena

Athena  47.6mm Nik-a-sil  Big Bore with 12mm Piston

This Athena big bore  kit is extremely  aggressive High Performance!
Nik-a-sil coating allows for  higher RPM than normal
which will get you that extra horsepower! 
12mm piston requires use of 12mm crankshaft!

12mm Crankshaft