# TBparts - Heavy Duty Valve Springs 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) > [Japanese Mini Bike Parts](https://tboltusa.com/store/japanese-mini-bike-parts-c-100.md) > [KLX 140](https://tboltusa.com/store/japanese-mini-bike-parts-klx-140-c-100_602.md) > [KLX140 Engine and Carb](https://tboltusa.com/store/klx-140-klx140-engine-and-carb-c-100_602_1142.md) > TBparts - Heavy Duty Valve Springs for KLX140
- **Web page:** [this page on tboltusa.com](https://tboltusa.com/store/tbparts-heavy-duty-valve-springs-for-klx140-p-2669.html)
- **Markdown:** [this page as markdown](https://tboltusa.com/store/tbparts-heavy-duty-valve-springs-for-klx140-p-2669.md)
- **Generated:** 2026-11-03 23:54 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=2669`

All prices are in US dollars (USD). Shipping and any tax are worked out at checkout.

## Summary

- **Part number:** TBW1926
- **Price:** $24.99 USD
- **Stock:** 3 left.
- **Product id:** 2669
- **Product last changed:** 2026-10-29

## 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.

- [Japanese Mini Bike Parts > KLX 140 > KLX140 Engine and Carb](https://tboltusa.com/store/klx-140-klx140-engine-and-carb-c-100_602_1142.md)
- [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 engine’s performance with TBparts Heavy Duty Valve Springs. Designed to handle higher RPMs and increased lift from performance camshafts, these springs are the ideal solution for high-output builds. Whether you’re installing a big bore kit or racing at the limit, our HD springs help prevent valve float and ensure consistent valve timing under extreme conditions. Whether you’re building a race-ready KLX140 or just want more power with peace of mind, these heavy duty valve springs are the perfect match. Run harder, rev higher, and stay in control with TBparts HD Valve Springs.

**Key Features:**

- Heavy-duty construction for increased 30% spring pressure
- Prevents valve float at high RPMs
- Ideal for performance cams and big bore kits
- Direct replacement – no modifications required
- Durable, long-lasting materials for reliable performance
- Designed specifically for the KLX140 engine
- Fits all years Kawasaki KLX140

**Note:** See main product pictures for important install details

## 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 - Heavy Duty Valve Springs for KLX140](https://tboltusa.com/store/tbparts-heavy-duty-valve-springs-for-klx140-p-2669.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/2669/qty/1` starts one with this product (the first value of every option, qty 1), `https://tboltusa.com/cart/<cart_code>/add/item/2669/qty/1` adds it to a cart you already started, and `https://tboltusa.com/cart/<cart_code>/zip/<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 - Heavy Duty Valve Springs for KLX140 in my cart](https://tboltusa.com/cart/open/item/2669/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/2669/tbparts-heavy-duty-valve-springs-for-klx140-1.58ce73a1.jpg)
- [Photo 2](https://tboltusa.com/store/img/p/2669/tbparts-heavy-duty-valve-springs-for-klx140-2.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.