# TBParts - 184cc Big Bore 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) > [Pit Bike Engine Parts](https://tboltusa.com/store/pit-bike-engine-parts-c-51.md) > [Parts & Kits ZS 155cc & YX150/160](https://tboltusa.com/store/pit-bike-engine-parts-parts-kits-zs-155cc-yx150160-c-51_105.md) > TBParts - 184cc Big Bore Kit GPX Pitster YX Piranha Lifan SSR - **Web page:** [this page on tboltusa.com](https://tboltusa.com/store/tbparts-184cc-big-bore-kit-gpx-pitster-yx-piranha-lifan-ssr-p-864.html) - **Markdown:** [this page as markdown](https://tboltusa.com/store/tbparts-184cc-big-bore-kit-gpx-pitster-yx-piranha-lifan-ssr-p-864.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=864` All prices are in US dollars (USD). Shipping and any tax are worked out at checkout. ## Summary - **Part number:** TBW9042 - **Price:** $229.99 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=864&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:** 864 - **Product last changed:** 2025-11-17 ## 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. - [Pit Bike Engine Parts > Parts & Kits ZS 155cc & YX150/160](https://tboltusa.com/store/pit-bike-engine-parts-parts-kits-zs-155cc-yx150160-c-51_105.md) - [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) 184cc Big Bore Kit **Application:** - Fits all YX160, GPX160 engines **Key Features:** - All aluminum ceramic plated 64mm cylinder with skirt - Lightweight high compression 64mm piston with rings, pin, & clips - Head gasket kit - includes the cylinder head o-ring set and an exhaust gasket. This is our most affordable 184 bore kit for the YX160/GPX160 engine. Works great with your stock YX160/GPX160 head or our new V2 Race Head. The kit includes an all aluminum ceramic plated 64mm cylinder (with short skirt) which will increase your engine displacement to 184cc. 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). Additionally, our head gasket kit 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 bore kit consists of high quality parts and requires no machining to the cases \- bolt on and go! This kit is only for the ZS155 and YX/GPX160 and not the YX/GPX150 **YX150cc NOTE: Cylinder has a short skirt that will not fit early YX 150cc , Later versions have a larger spigot hole and will be fine the O.D. of the Cylinder skirt is 66mm** **Recommended:** - Sta-bil fuel stabilizer - W-57-1129 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. **Kit Includes:** - TBW1250 - Cylinder - TBW0503 - Top end gasket kit - TBW0590 - Piston ## 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/864/tbparts-184cc-big-bore-kit-gpx-pitster-yx-piranha-lifan-ssr-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.