# TBParts - Stroker kit 1 108cc 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 1 108cc for Z50 CRF50 XR50 CRF70 - **Web page:** [this page on tboltusa.com](https://tboltusa.com/store/tbparts-stroker-kit-108cc-for-z50-crf50-xr50-crf70-p-43.html) - **Markdown:** [this page as markdown](https://tboltusa.com/store/tbparts-stroker-kit-108cc-for-z50-crf50-xr50-crf70-p-43.md) - **Generated:** 2026-11-10 12:01 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=43` All prices are in US dollars (USD). Shipping and any tax are worked out at checkout. ## Summary - **Part number:** TBW0966 - **Price:** $189.99 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:** 43 - **Product last changed:** 2025-06-03 ## 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) TB 108 Stroker kit 1 This is an affordable kit that will convert your TB 88cc Race Head kit into a powerful open class 108cc engine ! Stroker Crank was made specifically for the newer engines and thus, you will not have any fitment issues like trimming the piston skirts in order to clear the crank or the piston not lining up with the cylinder deck. **Key Features:** - 51mm Crankshaft with NTN bearings - Crankcase and clutch cover gaskets - Head gasket kit **Recommended:** - High volume oil pump - Oil Cooler - Billet clutch hub - CR8HSA spark plug (not required, but recommended) Exceeds OEM Standard equipment **Application:** - Honda Z50 - 1988-1999 - Honda XR50 - All Years - Honda CRF50 - All Years - CRF70 - All years **Kit Includes:** - TBW0319 - Stroker Carnk - TBW0287 - Gasket - TBW0334 - Gasket - TBW0206 - Gasket 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. You should also have the following parts: Recommend purchasing the Upgrade Disk Kit that is available in this section of the Catalog for TB manual clutch. Additionally, we do not recommend the use of an inner rotor kit with this clutch (on a 108cc or larger engine) as it can lead to premature clutch failure due to extra fatigue placed on the clutch housing. Also, do not tighten the clutch nut with a hammer and screw driver - it must be torqued on! ## 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 1 108cc for Z50 CRF50 XR50 CRF70](https://tboltusa.com/store/tbparts-stroker-kit-108cc-for-z50-crf50-xr50-crf70-p-43.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/43/qty/1` starts one with this product (the first value of every option, qty 1), `https://tboltusa.com/cart//add/item/43/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 1 108cc for Z50 CRF50 XR50 CRF70 in my cart](https://tboltusa.com/cart/open/item/43/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/43/tbparts-stroker-kit-108cc-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.