# TBParts - Stroker kit 3 108cc with Race Head for Z50 CRF50 XR50 CRF70 > 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) > [CRF50 Z50 & XR50](https://tboltusa.com/store/japanese-mini-bike-parts-crf50-z50-xr50-c-100_122.md) > [Big Bore & Engine Kits](https://tboltusa.com/store/crf50-z50-xr50-big-bore-engine-kits-c-100_122_124.md) > TBParts - Stroker kit 3 108cc with Race Head for Z50 CRF50 XR50 CRF70 - **Web page:** [this page on tboltusa.com](https://tboltusa.com/store/tbparts-stroker-kit-108cc-with-race-head-for-z50-crf50-xr50-crf70-p-269.html) - **Markdown:** [this page as markdown](https://tboltusa.com/store/tbparts-stroker-kit-108cc-with-race-head-for-z50-crf50-xr50-crf70-p-269.md) - **Generated:** 2026-11-10 18:01 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=269` All prices are in US dollars (USD). Shipping and any tax are worked out at checkout. ## Summary - **Part number:** TBW0968 - **Price:** $612.99 USD - **Stock:** 4 left. This is a kit: the count is how many complete kits can be built from the parts on hand. - **Product id:** 269 - **Product last changed:** 2026-08-30 ## 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 > CRF50 Z50 & XR50 > Big Bore & Engine Kits](https://tboltusa.com/store/crf50-z50-xr50-big-bore-engine-kits-c-100_122_124.md) - [Japanese Mini Bike Parts > CRF70 and XR70 > Big Bore & Engine Kits](https://tboltusa.com/store/crf70-and-xr70-big-bore-engine-kits-c-100_36_488.md) - [Pit Bike Engine Parts > Big Bore and Stroker Kits](https://tboltusa.com/store/pit-bike-engine-parts-big-bore-and-stroker-kits-c-51_24.md) - [TB Parts > CRF50 XR50 Z50 88-Up > CRF50 XR50 Z50 Big Bore and Stroker kits 1988 UP](https://tboltusa.com/store/crf50-xr50-z50-88-up-crf50-xr50-z50-big-bore-and-stroker-kits-1988-up-c-68_73_982.md) - [TB Parts > CRF70 XR70](https://tboltusa.com/store/tb-parts-crf70-xr70-c-68_77.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) TBParts Stroker Kit 3 108cc This kit is the complete kit to convert your stock motor into a powerful open class 108cc engine with Race Head and VM26 carb! **Key Features:** - 51mm Crankshaft with NTN bearings - High compression piston with rings, pin, & clips - Race Head with Large 25/22mm valves and porting for increased performance and big cooling fins. - High compression piston with rings, pin, & clips - Lightweight aluminum cylinder with steel sleeve, cast in mounts for skid plates, and large cooling fins. - High performance race camshaft - 26mm MIKUNI Carburetor kit with intake, air filter, and throttle cable. - Crankcase and clutch cover gaskets - Head gasket kit **Recommended:** - High volume oil pump - Oil Cooler - Heavy Duty clutch TBW0961 Exceeds OEM Standard equipment **Application:** - Honda Z50 - 1988-1999 - Honda XR50 - All Years - Honda CRF50 - All Years - Honda CRF70 - All years - Honda XR70 - All years **Kit Includes:** - TBW0319 - Crank - TBW0365 - Piston - TBW0287 - Gasket - TBW0334 - Gasket - TBW0206 - Gasket - TBW0301 - Throttle cable - TBW0316 - Intake Manifold - TBW0399 - Carb - TBW0413 - Air Filter - TBW0385 - Race Head & Valves Assembly - TBW0300 - Race Cam - TBW0156 - Cylinder This kit requires engine disassembly and therefore, we highly recommend a professional technician install this kit. If you plan on doing it yourself, you will need to have a Clymer or Honda shop manual. Instructions do not come with the kits but the installation of the crankshaft is just like installing a stock Honda crankshaft. Recommend purchasing the Upgrade Clutch TBW0961 from TBoltUSA. Also, do not tighten the clutch nut with a hammer and screw driver - it must be torqued on. We have a tool for this at TBoltUSA. See the TECH DATA for additional information on our performance products and links to instructions for the top end and oil pump. ## 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 - Stroker kit 3 108cc with Race Head for Z50 CRF50 XR50 CRF70](https://tboltusa.com/store/tbparts-stroker-kit-108cc-with-race-head-for-z50-crf50-xr50-crf70-p-269.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/269/qty/1` starts one with this product (the first value of every option, qty 1), `https://tboltusa.com/cart//add/item/269/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. 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 - Stroker kit 3 108cc with Race Head for Z50 CRF50 XR50 CRF70 in my cart](https://tboltusa.com/cart/open/item/269/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/269/tbparts-stroker-kit-108cc-with-race-head-for-z50-crf50-xr50-crf70-1.jpg) ## 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.