No Products in the Cart
Standard 143cc big bore kit! The 60mm bore is the biggest kit to run on the z125 Pro without machining your cases. Bolt on ready, no machine work needed. Just add Fuel controller.
Includes High Compression Piston which only works with V2 Head. Low Compression will work with stock Z125/KlX 110 heads.
143cc big bore kit has all the important elements to achieve higher performance and more power!
Kit specs and features:
Steady Garage R&D:
Additional recommended operational parts:
Optional parts for higher performance:
Professional installation is highly recommended!
Engine break-in, aftermarket fuel controller and special tune/autotune is required! Likewise with any major engine modification or bore up kits, it's now considered a high-performance race engine, extra attention and steps are needed to maintain a high-performance engine.
NO WARRANTY ON RACE ENGINE parts or engine bore up kits. There is no warranty stated or implied due to the unusual stresses placed on these parts and because we have no control over how they are installed and used. Steady Garage will not be held liable for any failure or damage caused directly or indirectly from use of these products or engine. The installation and use of these products or engine shall be conclusive evidence that the user assumes full responsibility for any damage caused directly or indirectly by their use.
This product is NOT legal for sale, installation, or use on a pollution-controlled vehicle in the state of California. This product is NOT CARB legal. Legal only for racing vehicles in closed course competitions which will never be driven on a public right of way.
This product is legal for closed-course competition use only; for racing vehicles (a competition vehicle not used on public highways). Intended for off-road use or race purposes; does not meet regulations of pollution-controlled roads or highways.