FREE SHIPPING to the lower 48 US states on orders $30 and over!! (**Heavy/Oversized items excluded)

Please email us with your questions or you can text them to 909-559-0309 M-F 9am - 5pm

TB Parts

TB Parts 143cc Big Bore Kit (incl. Race Head V2, & Intake Manifold Kit) - TBW9175

  • Sale
  • $ 599.99


Fits 2017-2018 Kawasaki Z125 Pro
143cc Big Bore Performance Kit (60mm):

- NEW Ceramic coated all aluminum cylinder (no steel sleeve)
- Lightweight high compression domed 60mm piston with rings, pin, & clips
- NEW Head gasket kit - Now includes the cylinder head o-ring set and an exhaust gasket.
- Forged anodized aluminum roller rockers
- Huge 30mm intake and 24.5mm exhaust valves
- Stainless Steel Valves (21-4N material)
- 27mm intake port, 23mm exhaust port
- Race Camshaft V2-1 (can request substitution of the V2-2 Cam with your order)
- Cam Sprocket
- Port matched to the Race Head V2
- Enlarged 26mm port on throttle body side to work better with bored throttle bodies  (also works well with stock throttle body) - a port matched heat stop to prevent heat transfer to the intake  (cannot run a heat stop with the stock intake manifold and some aftermarket head spacers)
- All mounting hardware
- A heat sensor extension harness so it can be relocated to the tappet or cam cover.

The all aluminum ceramic coated cylinder is lighter than a steel sleeved aluminum cylinder, reduces friction (increasing power), improves sealing, and provides better heat transfer (runs and cools down quicker). This new cylinder along with a complete head gasket kit and domed piston set this kit apart from other similarly priced 143 kits on the market. Affordable and will make your Z125  a lot more fun to ride!  High quality parts and requires no machining to the cases or other modifications - bolt on and go! 

IMPORTANT NOTE:  Any bore kit for the Z125 must be used with an aftermarket fuel controller to prevent a lean condition and damage to your engine
There are no installation instructions, but if you can replace your piston, you can install this kit. If you don't have any experience working on your engine, we highly recommend purchasing the shop manual for your bike available in this section or from your local Kawasaki or Suzuki dealer. The parts are installed in the same manner as the OEM parts.