# TBparts - +6mm Stroker Crank for KLX140 > 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) > [KLX140](https://tboltusa.com/store/tb-parts-klx140-c-68_1113.md) > TBparts - +6mm Stroker Crank for KLX140 - **Web page:** [this page on tboltusa.com](https://tboltusa.com/store/tbparts-6mm-stroker-crank-for-klx140-p-12630.html) - **Markdown:** [this page as markdown](https://tboltusa.com/store/tbparts-6mm-stroker-crank-for-klx140-p-12630.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=12630` All prices are in US dollars (USD). Shipping and any tax are worked out at checkout. ## Summary - **Part number:** TBW1916 - **Price:** $284.99 USD - **Stock:** 8 left. - **Product id:** 12630 - **Product last changed:** 2026-05-12 ## 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 > KLX140](https://tboltusa.com/store/tb-parts-klx140-c-68_1113.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) Upgrade your KLX140 engine with the TBparts +6mm Stroker Crankshaft. This is a high quality forged crankshaft designed to deliver major power and torque gains throughout the entire RPM range while maintaining excellent reliability. The +6mm stroke increases displacement and produces a noticeable improvement in bottom end torque and overall acceleration, making it a great upgrade for performance builds, big bore combinations, or race applications. Unlike many cheaper competitor crankshafts on the market, the TBparts crankshaft is built using high quality materials and proven manufacturing processes for superior durability and performance. The crank features smooth edge counterweights for improved performance and reduced stress points along with a heavy duty DIRECT REPLACMENT flywheel bolt with a 12mm head for added strength and easier servicing. This crankshaft is designed as a drop-in style upgrade for easy installation and excellent fitment. **Key Features:** - +6mm Stroker Design - Forged Crankshaft Construction - Smooth Edge Crank Counterweights - Drop In Style Installation - Includes HD Flywheel Bolt with 12mm Head - Major Torque and Horsepower Gains - High Quality TBparts Proven Design - Excellent Performance and Value **Application:** - KLX140 - All models and years **Installation Notes:** - Works with stock cylinder, piston, and cylinder head. - Works with our 170cc bore kits, we recommend using a forged piston for longer life. - Add this to your 170cc bore kit to make it 188cc - Double check clearances with other manufactures parts. This turns the aftermarket 186cc kits into 206cc and 197cc kits to 220cc. - DO NOT USE WITH THIN SKIRT CYLINDERS ## 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 - +6mm Stroker Crank for KLX140](https://tboltusa.com/store/tbparts-6mm-stroker-crank-for-klx140-p-12630.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/12630/qty/1` starts one with this product (the first value of every option, qty 1), `https://tboltusa.com/cart//add/item/12630/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 - +6mm Stroker Crank for KLX140 in my cart](https://tboltusa.com/cart/open/item/12630/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/12630/tbparts-6mm-stroker-crank-for-klx140-1.jpg) - [Photo 2](https://tboltusa.com/store/img/p/12630/tbparts-6mm-stroker-crank-for-klx140-2.jpg) - [Photo 3](https://tboltusa.com/store/img/p/12630/tbparts-6mm-stroker-crank-for-klx140-3.jpg) - [Photo 4](https://tboltusa.com/store/img/p/12630/tbparts-6mm-stroker-crank-for-klx140-4.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.