# TBParts - 114cc Bore Kit for TRX 90 > 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) > [Mini Quad ATC ATV Parts](https://tboltusa.com/store/mini-quad-atc-atv-parts-c-65.md) > [TRX 90](https://tboltusa.com/store/mini-quad-atc-atv-parts-trx-90-c-65_64.md) > TBParts - 114cc Bore Kit for TRX 90 - **Web page:** [this page on tboltusa.com](https://tboltusa.com/store/tbparts-114cc-bore-kit-for-trx-90-p-595.html) - **Markdown:** [this page as markdown](https://tboltusa.com/store/tbparts-114cc-bore-kit-for-trx-90-p-595.md) - **Generated:** 2026-11-04 04:52 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=595` All prices are in US dollars (USD). Shipping and any tax are worked out at checkout. ## Summary - **Part number:** TBW9089-TRX90 - **Price:** $185.99 USD - **Stock:** In stock. This is a kit: the count is how many complete kits can be built from the parts on hand. - **Reviews:** [1 reviews, average 5 of 5](https://tboltusa.com/store/reviews/tbparts-114cc-bore-kit-for-trx-90-pr-595.html) - **Product id:** 595 - **Product last changed:** 2023-02-22 ## 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. - [Mini Quad ATC ATV Parts > TRX 90](https://tboltusa.com/store/mini-quad-atc-atv-parts-trx-90-c-65_64.md) - [TB Parts > TRX90](https://tboltusa.com/store/tb-parts-trx90-c-68_808.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 114cc High Compression Bore Kit - 86cc - 107cc Engines **Application:** - TRX 90 - LIFAN 86-107cc - SIKK MX 110 - XTREME 107 - ICON **Key Features:** - Lightweight aluminum cylinder with steel liner - Cast in mounts on cylinder for aftermarket skid plates - Oversized cooling fins on cylinder for efficient heat dissipation - High compression 54mm piston with rings, pin, & clips (replaces your low compression dished or flat top piston) - Head gasket kit **Kit Includes:** - TBW0788 - Piston - TBW0318 - Gasket - TBW0721 - Cylinder **Note:** **1)MUST USE WASHER UNDER SPARK PLUG (Included in piston box)** **2)**You May need OEM Honda Dowels for this application**** ****(2) 90701-GF6-000 - DOWEL PIN FOR TRX90**** ****(not included) 3)Newer TRX90 with AIR SUCTION VALVE attached to head will need to run a RACE HEAD in addition to this kit**** This will make a huge difference in performance over your stock setup and is a very quick and easy upgrade. For additional performance, add the 24mm or 26mm carb kit available in this section (both work great with this setup). This kit will work on all 86cc through 107 Chinese engines Except models with a 3 valve head.the cylinder stud spacing is different on SDG 107 (SDG SPEED MINI 107) Our Race Heads will work with your 2 valve head and will come with our huge Race Cam. Additionally, our Race Head uses Honda type cams so there are many cam options available for your particular type of riding, unlike the limited selection of cams available for the Chinese heads. 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. TRX90 will NOT need the high volume oil pump AND we now have the cylinder set up for drop on install with no case mods ## 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 - 114cc Bore Kit for TRX 90](https://tboltusa.com/store/tbparts-114cc-bore-kit-for-trx-90-p-595.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/595/qty/1` starts one with this product (the first value of every option, qty 1), `https://tboltusa.com/cart//add/item/595/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 - 114cc Bore Kit for TRX 90 in my cart](https://tboltusa.com/cart/open/item/595/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/595/tbparts-114cc-bore-kit-for-trx-90-1.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.