# TBParts - 178cc Big Bore Kit, Race Head V2, and Intake Manifold Kit Z125 > This is a plain-text (markdown) copy of a page on tboltusa.com, made for AI assistants. People see the same page at the HTML link below. - **Breadcrumbs:** [Home](https://tboltusa.com/store/index.md) > [Japanese Mini Bike Parts](https://tboltusa.com/store/japanese-mini-bike-parts-c-100.md) > [Z125 PRO](https://tboltusa.com/store/japanese-mini-bike-parts-z125-pro-c-100_1031.md) > TBParts - 178cc Big Bore Kit, Race Head V2, and Intake Manifold Kit Z125 - **Web page:** [this page on tboltusa.com](https://tboltusa.com/store/tbparts-178cc-big-bore-kit-race-head-v2-and-intake-manifold-kit-z125-p-10749.html) - **Markdown:** [this page as markdown](https://tboltusa.com/store/tbparts-178cc-big-bore-kit-race-head-v2-and-intake-manifold-kit-z125-p-10749.md) - **Generated:** 2026-11-05 05:34 EST - **Site guide for AI assistants:** [llms.txt](https://tboltusa.com/llms.txt) - **Your list:** To list everything you have looked at in one page, with current prices and stock, add ids to this address (comma separated, up to 20 of each): `https://tboltusa.com/store/seen.md?p=10749` All prices are in US dollars (USD). Shipping and any tax are worked out at checkout. ## Summary - **Part number:** TBW9178 - **Price:** $679.99 USD (before options) - **Stock:** 2 left. This is a kit: the count is how many complete kits can be built from the parts on hand. - **Product id:** 10749 - **Product last changed:** 2025-06-02 ## Options This product has options. Pick one value for every option. A value marked +$X adds that amount to the price; -$X takes it off. ### Cam Selection - TBW1777 - Stage 1 Camshaft: no price change: `choice/3-855` - TBW0473 - Stage 2 Camshaft: no price change: `choice/3-856` - TBW1775 - Stage 3 Camshaft: no price change: `choice/3-857` - TBW0577 - Stage 4 Camshaft: no price change: `choice/3-858` ## What it fits The store lists a part under each bike or engine model it is meant for (the categories below) and may name models in the description. Do not assume it fits a bike or engine that is not named here; ask the store first. - [Japanese Mini Bike Parts > Z125 PRO](https://tboltusa.com/store/japanese-mini-bike-parts-z125-pro-c-100_1031.md) - [TB Parts > Z125 PRO](https://tboltusa.com/store/tb-parts-z125-pro-c-68_1091.md) Where a fitment line says "All", it means all years of the model named on that line, not all bikes. ## Description (the store's own text) This is the largest bore kit available from TBParts. With a 67mm piston and V2 race head, this will transform your Z125 into a powerhouse! **Key features:** - Lightweight high compression 67mm piston - Aluminum cylinder for better heat dissipation and further weight reduction from stock. - V2 roller rocker race head provides much larger valves and aggressive cam with roller rocker arms **Kit Includes:** - TBW0758 - Piston - TBW0897 - Cylinder - TBW1007 - 67mm gasket set - TBW1224 - Intake Kit - TBW0645 - Cam sprocket - TBW0459 - V2 head - TBW1777 or TBW0473 or TBW1775 or TBW0577 - Camshaft **Application:** - Kawasaki Z125 - All years **Note: Case boring required MUST BE USED WITH AN AFTERMARKET FUEL CONTROLLER TO PREVENT A LEAN CONDITION AND DAMAGE TO YOUR ENGINE WE RECOMMEND PREMIUM FUEL** ## More notes the store shows with this product **Camshaft Selection info:** TBW1777 - Stage 1 Camshaft - Best low end to midrange TBW0473 - Stage 2 Camshaft - Great low end to midrange with more over-rev TBW1775 - Stage 3 Camshaft - Good low end, better midrange to top end TBW0577 - Stage 4 Camshaft - Best midrange to top end with best over-rev ## Shipping and returns - Flat rate shipping is $8 for parts orders under $75 and free for most parts orders over $75, within the continental 48 states. Heavy items (engines, complete bikes, suspension) are excluded. - Full shipping policy: [Shipping policies](https://tboltusa.com/store/shipping-policies-i-6.md) - Returns: the store's own policy page says how returns, exchanges and cancellations work. Please read it before buying: [Returns, Exchanges and Cancellations](https://tboltusa.com/store/returns-exchanges-and-cancellations-i-11.md) The page begins: "All products returned to T Bolt USA must be reviewed and approved." ## How to buy For a person: open [TBParts - 178cc Big Bore Kit, Race Head V2, and Intake Manifold Kit Z125](https://tboltusa.com/store/tbparts-178cc-big-bore-kit-race-head-v2-and-intake-manifold-kit-z125-p-10749.html), choose any options, press "Add to Cart", then check out from the cart. Payment is only ever entered by the person, on tboltusa.com's own checkout pages. For an AI assistant building a cart: `https://tboltusa.com/cart/new/item/10749/choice/3-855/qty/1` starts one with this product (the first value of every option, qty 1), `https://tboltusa.com/cart//add/item/10749/choice/3-855/qty/1` adds it to a cart you already started, and `https://tboltusa.com/cart//zip/` gives the shipping options to a US ZIP code. They answer JSON: give your customer the newest `cart_link`, a public cart link, safe to share. To choose other values, swap in a `choice/` piece from the Options above; `qty/` sets the quantity. More products: add more `item/...` parts. Or give the person one link that fills their own cart when they open it (a public cart link, safe to share; the first value of every option, qty 1): [Put TBParts - 178cc Big Bore Kit, Race Head V2, and Intake Manifold Kit Z125 in my cart](https://tboltusa.com/cart/open/item/10749/choice/3-855/qty/1) Payment: all major credit cards, PayPal, Apple Pay and Google Pay. Money orders by arrangement. Cart: [Shopping cart](https://tboltusa.com/store/shopping_cart.php) ## Photos - [Photo 1](https://tboltusa.com/store/img/p/10749/tbparts-178cc-big-bore-kit-race-head-v2-and-intake-manifold-kit-z125-1.png) ## Support Since 2004, every purchase from TBolt USA includes access to technical support from our staff of experts and our online [Pit Bike Technical Info Database](https://tboltusa.com/store/tbolt-usa-pit-bike-minimoto-technical-info-database-tech-15.md)! We have all necessary support parts on hand. *Most* orders ship same, or next business day, unless otherwise noted above.