TB Parts 55mm Stroker crankshaft! Increase your displacement, torque, and power by replacing your stock crankshaft with this one. No modifications are needed and works with the stock bore and cylinder head and all big bore kits that use cylinders with a skirt. These are a great upgrade if you are rebuilding your engine or looking for the performance advantage over just running a standard big bore kit. 

Fits the following models:

• 2017 Z125 to present

Important Information:

Installation requires complete engine dis-assembly. Therefore, we highly recommend a professional technician install this crankshaft and check clearances.