# TBParts - Roller Rocker Race Head V2 146cc Big Bore w/VM26 Carb Kit China 124cc & 140cc engines

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- **Breadcrumbs:** [Home](https://tboltusa.com/store/index.md) > [Pit Bike Engine Parts](https://tboltusa.com/store/pit-bike-engine-parts-c-51.md) > [GPX YX 124 & 140 Parts and Kits](https://tboltusa.com/store/pit-bike-engine-parts-gpx-yx-124-140-parts-and-kits-c-51_29.md) > TBParts - Roller Rocker Race Head V2 146cc Big Bore w/VM26 Carb Kit China 124cc & 140cc engines
- **Web page:** [this page on tboltusa.com](https://tboltusa.com/store/tbparts-roller-rocker-race-head-v2-146cc-big-bore-wvm26-carb-kit-china-124cc-140cc-engines-p-1316.html)
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All prices are in US dollars (USD). Shipping and any tax are worked out at checkout.

## Summary

- **Part number:** TBW9128
- **Price:** $762.99 USD
- **Stock:** 3 left. 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-roller-rocker-race-head-v2-146cc-big-bore-wvm26-carb-kit-china-124cc-140cc-engines-pr-1316.html)
- **Product id:** 1316
- **Product last changed:** 2026-10-10

## 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 > GPX YX 124 & 140 Parts and Kits](https://tboltusa.com/store/pit-bike-engine-parts-gpx-yx-124-140-parts-and-kits-c-51_29.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)

TB Roller Rocker Race Head V2 146cc Big Bore w/VM26 Carb Kit
China 124cc & 140cc engines

Highest Performance Race head on the market with full parts support in stock.

*Meets or Exceeds OEM Specifications.*

**Key Features:**

- Roller rocker arms exactly like the V2 head for the KLX110
- 28.5mm intake Valve
- 23.5mm exhaust Valve
- 5mm valve stem
- 23mm exhaust port
- Matching high compression piston
- Head kits include all hardware
- 57mm piston with rings, pin, & clips
- 57mm all aluminum cylinder with steel line
- VM26 Carb Kit
- High performance race camshaft (for the Race Head only)
- Head gasket kit

**Recommended:**

- Sta-bil fuel stabilizer - W-57-1129
- Uni foam filter spray - W-82-1000

See the Performance Info section for additional information on our performance parts.

**Application:**

- China 124cc & 140cc engines with a 13mm wrist pin
and 78mm tall cylinder
- GPX 125 and 140
- Pitster Pro 140
- Piranha 125 and 140

**Kit Includes:**

- TBW0751 - V2 Race head
- TBW0821 - V2 Head bolt kit
- TBW0752 - Cam
- TBW0754 - V2 Head cover set
- TBW0414 - Cam sprocket
- TBW0823 - Piston
- TBW0862 - Top end gasket set
- TBW0601 - Cylinder
- TBW0301 - Throttle cable
- TBW0433 - Intake kit
- TBW0399 - VM26 Carb
- TBW0413 - Air filter

## More notes the store shows with this product

Assembly info
SEE TECH DATA LINK
[tboltusa.com/store/tech.php](https://tboltusa.com/store/tech.php?pID=216/TBparts+V2+Honda+TBW0750+and+China+TBW0751+head+TECH)?

## Tech articles for this product

The TBolt USA Tech Database is the store's free online library of pit bike technical info. The articles below are linked from this product's own page.

- [TBparts V2 Honda TBW0750 and China TBW0751 head TECH](https://tboltusa.com/store/tbparts-v2-honda-tbw0750-and-china-tbw0751-head-tech-216.md)

## 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 - Roller Rocker Race Head V2 146cc Big Bore w/VM26 Carb Kit China 124cc & 140cc engines](https://tboltusa.com/store/tbparts-roller-rocker-race-head-v2-146cc-big-bore-wvm26-carb-kit-china-124cc-140cc-engines-p-1316.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/1316/qty/1` starts one with this product (the first value of every option, qty 1), `https://tboltusa.com/cart/<cart_code>/add/item/1316/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 - Roller Rocker Race Head V2 146cc Big Bore w/VM26 Carb Kit China 124cc & 140cc engines in my cart](https://tboltusa.com/cart/open/item/1316/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/1316/tbparts-roller-rocker-race-head-v2-146cc-big-bore-wvm26-carb-kit-china-124cc-140-1.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.