# TBParts - Vintage Honda 108cc Stroker big bore & Nibbi 24mm Carb kit 69-81 Z50 > 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) > [Honda Vintage Mini Bike Parts](https://tboltusa.com/store/honda-vintage-mini-bike-parts-c-101.md) > [Z50 K0-K2 HARDTAIL](https://tboltusa.com/store/honda-vintage-mini-bike-parts-z50-k0-k2-hardtail-c-101_1123.md) > [Big Bore and Engine Kits](https://tboltusa.com/store/z50-k0-k2-hardtail-big-bore-and-engine-kits-c-101_1123_1125.md) > TBParts - Vintage Honda 108cc Stroker big bore & Nibbi 24mm Carb kit 69-81 Z50 - **Web page:** [this page on tboltusa.com](https://tboltusa.com/store/tbparts-vintage-honda-108cc-stroker-big-bore-nibbi-24mm-carb-kit-69-81-z50-p-2634.html) - **Markdown:** [this page as markdown](https://tboltusa.com/store/tbparts-vintage-honda-108cc-stroker-big-bore-nibbi-24mm-carb-kit-69-81-z50-p-2634.md) - **Generated:** 2026-11-10 13:05 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=2634` All prices are in US dollars (USD). Shipping and any tax are worked out at checkout. ## Summary - **Part number:** TBW9092-69-81Z50 - **Price:** $579.99 USD - **Stock:** Out of stock. It cannot be added to the cart right now. A person can ask to be emailed when it is back: [Get on the List](https://tboltusa.com/store/contact_us.php?pid=2634&stockcheck=true) ([Contact us](https://tboltusa.com/store/contact_us.md)) This is a kit: the count is how many complete kits can be built from the parts on hand. - **Product id:** 2634 - **Product last changed:** 2026-02-19 ## 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. - [Honda Vintage Mini Bike Parts > Z50 K0-K2 HARDTAIL > Big Bore and Engine Kits](https://tboltusa.com/store/z50-k0-k2-hardtail-big-bore-and-engine-kits-c-101_1123_1125.md) - [Honda Vintage Mini Bike Parts > Z50 K3-78 > Engine Kits and parts](https://tboltusa.com/store/z50-k3-78-engine-kits-and-parts-c-101_215_581.md) - [TB Parts > Z50 K0-78 > Z50 K0-78 Big Bore and stroker kits](https://tboltusa.com/store/z50-k0-78-z50-k0-78-big-bore-and-stroker-kits-c-68_1063_1070.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) 108cc Stroker Crank with Race Head Kit w/ Nibbi 24mm carb kit Crankshaft measures 57mm from gear to end. This kit is the complete kit to convert your stock motor into a powerful open class 108cc engine. Also, this 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. Race Head has been updated for even more performance! It now has 25/22mm valves with better porting/flow. We also kept the combustion chamber the same size and changed the angle of the valves slightly. Please see the Billet Housing upgrade available in this section for more details. Also, do not tighten the clutch nut with a hammer and screw driver - it must be torqued on! 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. We recommend purchasing the Upgrade Disk Kit for your 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. However, we offer an upgrade which allows use of inner rotor kits and larger displacement engines **Application:** - 69-81 Z50 **Kit Contents:** - TBW0622 - Crank - TBW0365 - Piston - TBW0225 - Oil Pump - TBW0287 - Gasket - TBW0334 - Gasket - TBW0206 - Gasket - TBW0273 - Intake - TBW0301 - Throttle - NB-PE24YJ - Carb - W-78-9455 - Air Filter - TBW0327 - Jet Kit - TBW0385 - Race Head and Valves Assembly - TBW0251 - Right Side Cover - TBW0189 - Cam - TBW0156 - Cylinder - TBW0861 - Cam Sprocket ## 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 This item is out of stock, so it cannot go in the cart now (see Stock above). Cart: [Shopping cart](https://tboltusa.com/store/shopping_cart.php) ## Photos - [Photo 1](https://tboltusa.com/store/img/p/2634/tbparts-vintage-honda-108cc-stroker-big-bore-nibbi-24mm-carb-kit-69-81-z50-1.jpg) - [Photo 2](https://tboltusa.com/store/img/p/2634/tbparts-vintage-honda-108cc-stroker-big-bore-nibbi-24mm-carb-kit-69-81-z50-2.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.