ENGINE (Big Bore Kits and Engine Parts )

Kawasaki Z125 Pro Big Bore Kits

Boost the performance of your Kawasaki Z125 Pro with a big bore kit from Hard Racing. The Z125 Pro shares its 125cc DOHC engine architecture with the Honda Grom, and Takegawa has developed purpose-built bore-up kits specifically for the Z125 platform — offering displacement increases to 143cc or 181cc.

Popular Z125 Pro Big Bore Options

The stock Kawasaki Z125 Pro displaces 125cc. A big bore kit replaces the cylinder and piston with a larger bore to increase displacement, delivering noticeably more torque across the RPM range. Takegawa's 143cc kit is a reliable bolt-on upgrade; the 181cc kit delivers serious performance gains best paired with a performance camshaft.

Brands We Carry

Takegawa is the top name in Z125 Pro performance parts. Their bore-up kits for the Z125 use forged pistons and precision-machined cylinders engineered for the Z125's engine cases. Most kits are designed for 2017+ Z125 Pro models and are verified compatible with stock transmission and clutch.

Camshafts & Engine Parts

Get the most from your Z125 big bore kit by pairing it with a Takegawa performance camshaft. We also carry Z125 Pro engine gaskets, cam chains, and other internal parts to complete your engine build.

Questions? Call 704-799-2192. Fast shipping from our Charlotte, NC warehouse.