# TBParts - 184cc Bore Kit w/ V2 Race Head and Nibbi 28mm Carb Kit GPX Pitster YX Piranha Lifan SSR > 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) > [Chinese Engines](https://tboltusa.com/store/tb-parts-chinese-engines-c-68_70.md) > TBParts - 184cc Bore Kit w/ V2 Race Head and Nibbi 28mm Carb Kit GPX Pitster YX Piranha Lifan SSR - **Web page:** [this page on tboltusa.com](https://tboltusa.com/store/tbparts-184cc-bore-kit-v2-race-head-and-nibbi-28mm-carb-kit-gpx-pitster-yx-piranha-lifan-ssr-p-1418.html) - **Markdown:** [this page as markdown](https://tboltusa.com/store/tbparts-184cc-bore-kit-v2-race-head-and-nibbi-28mm-carb-kit-gpx-pitster-yx-piranha-lifan-ssr-p-1418.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=1418` All prices are in US dollars (USD). Shipping and any tax are worked out at checkout. ## Summary - **Part number:** TBW9040 - **Price:** $739.99 USD (before options) - **Stock:** Out of stock. It cannot be added to the cart right now. A person can ask to be emailed when it is back: [Get on the List](https://tboltusa.com/store/contact_us.php?pid=1418&stockcheck=true) ([Contact us](https://tboltusa.com/store/contact_us.md)) This is a kit: the count is how many complete kits can be built from the parts on hand. - **Product id:** 1418 - **Product last changed:** 2025-06-03 ## Options This product has options. Pick one value for every option. A value marked +$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. - [TB Parts > Chinese Engines](https://tboltusa.com/store/tb-parts-chinese-engines-c-68_70.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 our latest complete kit to turn your YX/GPX/Zongchen 150cc to 160cc engine into an absolute beast! This kit includes our new Race Head V2 and while the new head may appear to be the same on the outside as our old KLX110 type race head, internally it has gone through numerous changes. The addition of roller rocker arms and a new camshaft are the biggest changes followed by bigger valves and ports. The exhaust valve is now stainless as well (21-4N material). This all adds up to a cylinder head that puts out a professional level of performance yet is still affordable for the privateer rider. The kit also includes an all aluminum ceramic plated 64mm cylinder (with skirt). This cylinder is lighter than a steel sleeved aluminum cylinder, reduces friction (increasing power), improves sealing, and provides better heat transfer (runs and cools down quicker). We top off the roller head with a Nibbi 28mm performance carb kit that is easy to tune and works much better with this setup than your stock Chinese 26mm carb. Additionally, our head gasket kit also includes a head o-ring set and exhaust gasket so you don't have to re-use your old ones or make a trip to your local dealer to get new ones and spend more money. The new top end consists of high quality parts and requires no machining to the cases - bolt on and go! There are no installation instructions, but if you can replace your piston, you can install this kit. If you don't have any experience working on your engine, we highly recommend having a professional technician install this kit. The parts are installed in the same manner as OEM parts. **Key Features:** - Race Head V2 - Roller rockers, 30mm intake valve, 24.5mm exhaust valve, 27mm intake port, 23mm exhaust port (valves installed). - The Race Camshaft V2-1 for the V2 head has been switched to our new version V2-2 for larger displacement engines (P/N TBW0577) and increases the performance. - All aluminum ceramic plated 64mm cylinder with skirt - We increased the skirt height and size on the lightweight high compression 64mm piston with rings, pin, & clips to increase reliability and service life (picture is not updated yet showing piston change) - Head gasket kit - includes the cylinder head o-ring set and an exhaust gasket. - Nibbi 28mm performance carb - Rear Facing Intake Kit - not forward facing like the KLX110 style (picture is not updated yet showing intake change) - Jet kit for varying conditions and exhausts **Application:** This kit is only for the YX and ZS 150cc to 160cc engines with KLX110 type top end. The increase in displacement will depend on your stock engine size. With this kit: 1. A stock 150cc engine will increase to 170cc 2. A stock 155cc engine will increase to 177cc 3. A stock 160cc engine will increase to 184cc **Kit Includes:** - TBW0459 - V2 head - TBW1777 or TBW0473 or TBW1775 or TBW0577 camshaft - TBW1250 - Cylinder - TBW0503 - Top end gasket - TBW0590 - Piston - TBW0301 - Throttle cable - TBW0556 - Intake kit - TBW0327 - Jet kit - TBW1655 - Nibbi Carb - TBW0491 - Air filter ## 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 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/1418/tbparts-184cc-bore-kit-v2-race-head-and-nibbi-28mm-carb-kit-gpx-pitster-yx-piran-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.