TBParts 143cc Big Bore Kit with Performance Camshaft – Kawasaki Z125 Pro (2017+)

TBParts 143cc Big Bore Kit with Performance Camshaft – Kawasaki Z125 Pro (2017+)

The 143cc big bore kit and TBParts performance camshaft together — the combination that makes the Z125 engine race-ready. The cam opens the valves further so the larger bore can breathe better, delivering more power across the entire RPM range. You will not believe the night-and-day difference over stock.

The ceramic-coated all-aluminum cylinder reduces friction, improves sealing, and transfers heat faster than a steel-sleeved alternative. The 10.9:1 high-compression domed piston is pump-gas friendly, and the camshaft is a brand-new grind — not a regrind — with new Taiwan TPI bearings built to OEM specifications. 20% power gains over stock throughout the RPM range, unlike cams that sacrifice bottom-end to gain top-end.

What’s Included

• Ceramic-coated all-aluminum 60mm cylinder (no steel sleeve)
• Lightweight high-compression domed 60mm piston with rings, pin & clips (stock cylinder head compatible)
• 10.9:1 compression — 91+ octane pump gas recommended
• Head gasket kit — includes cylinder head O-ring set and exhaust gasket
• Brand-new performance camshaft with new Taiwan TPI bearings (OEM spec)

Kit part numbers: TBW0305, TBW0306, TBW0377, TBW0378, TBW1431, TBW0645

Important Notes

• Bolt-on kit for 2017+ Kawasaki Z125 Pro only
• Camshaft is designed for use with the stock cylinder head
• This is not a decompression cam — starting behavior is not affected
• Fuel system tuning is required for optimal performance and to prevent running lean

Installation Notes

No installation instructions are included. Parts install in the same manner as OEM components. If you have no engine experience, professional installation is strongly recommended. A free KLX110 shop manual (very similar engine) is available in the INFO section of our website.

Fitment

• Kawasaki Z125 Pro (2017+)