# TBParts - Race Head V2 Upgrade Kit 88-99 Z50, 00-Present XR50/CRF50 > 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) > [TB Parts](https://tboltusa.com/store/tb-parts-c-68.md) > [CRF50 XR50 Z50 88-Up](https://tboltusa.com/store/tb-parts-crf50-xr50-z50-88-up-c-68_73.md) > [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) > TBParts - Race Head V2 Upgrade Kit 88-99 Z50, 00-Present XR50/CRF50 - **Web page:** [this page on tboltusa.com](https://tboltusa.com/store/tbparts-race-head-v2-upgrade-kit-88-99-z50-00-present-xr50crf50-p-9993.html) - **Markdown:** [this page as markdown](https://tboltusa.com/store/tbparts-race-head-v2-upgrade-kit-88-99-z50-00-present-xr50crf50-p-9993.md) - **Generated:** 2026-11-03 17:36 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=9993` All prices are in US dollars (USD). Shipping and any tax are worked out at checkout. ## Summary - **Part number:** TBW9103 - **Price:** $549.99 USD - **Stock:** 2 left. This is a kit: the count is how many complete kits can be built from the parts on hand. - **Product id:** 9993 - **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. - [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) 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) Race Head V2 upgrade kit. This kit converts a 95cc/117cc (54mm bore) kit with a stock or older Race Head to the Race Head V2. We recommend premium fuel. **Key Features:** - Larger valves for increased airflow - Aluminum head helps dissipate heat to aid in the longevity of the motor. - Race camshaft included - Head cover set - Lightweight, high quality cast aluminum piston and rings included **Recommended:** - 2 Size clutch tool - WHS-2274 - High volume oil pump - TBW0226-12V - TBparts oil cooler for V2 heads - TBW9187 - TB 12 way rotating spacer - TBW1487 **Application:** - Z50 - 1988-1999 - CRF50 - 2000-Present - XR50 - 2000-Present **Kit Includes:** - TBW0750 - Race Head V2 Honda Type (No Cam) - TBW0821 - Race Head V2 Bolt Kit - TBW0752 - Cam - TBW0754 - Race Head V2 Head Cover Set (All 4 Cast Covers) - TBW0790 - Piston - TBW0859 - Gasket Installation Note: It will save a lot of time and effort if the oil pump is installed while installing the bore kit (requires cylinder removal). See the Performance Info section for additional information on our performance parts. ## More notes the store shows with this product Assembly info SEE TECH DATA LINK [tboltusa.com/store/tech.php](https://tboltusa.com/store/tech.php?pID=216/TBparts+V2+Honda+TBW0750+and+China+TBW0751+head+TECH)? ## Tech articles for this product The TBolt USA Tech Database is the store's free online library of pit bike technical info. The articles below are linked from this product's own page. - [TBparts V2 Honda TBW0750 and China TBW0751 head TECH](https://tboltusa.com/store/tbparts-v2-honda-tbw0750-and-china-tbw0751-head-tech-216.md) ## 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 - Race Head V2 Upgrade Kit 88-99 Z50, 00-Present XR50/CRF50](https://tboltusa.com/store/tbparts-race-head-v2-upgrade-kit-88-99-z50-00-present-xr50crf50-p-9993.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/9993/qty/1` starts one with this product (the first value of every option, qty 1), `https://tboltusa.com/cart//add/item/9993/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 - Race Head V2 Upgrade Kit 88-99 Z50, 00-Present XR50/CRF50 in my cart](https://tboltusa.com/cart/open/item/9993/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/9993/tbparts-race-head-v2-upgrade-kit-88-99-z50-00-present-xr50crf50-1.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.