# TBparts - 143, 165, & 178cc V2 Race Head and Intake Upgrade Kit

> 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) > [Z125 PRO](https://tboltusa.com/store/japanese-mini-bike-parts-z125-pro-c-100_1031.md) > TBparts - 143, 165, & 178cc V2 Race Head and Intake Upgrade Kit
- **Web page:** [this page on tboltusa.com](https://tboltusa.com/store/tbparts-143-165-178cc-v2-race-head-and-intake-upgrade-kit-p-10746.html)
- **Markdown:** [this page as markdown](https://tboltusa.com/store/tbparts-143-165-178cc-v2-race-head-and-intake-upgrade-kit-p-10746.md)
- **Generated:** 2026-11-04 10:55 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=10746`

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

## Summary

- **Part number:** TBW9176
- **Price:** $489.99 USD (before options)
- **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=10746&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:** 10746
- **Product last changed:** 2025-06-02

## Options

This product has options. Pick one value for every option. A value marked +$X adds that amount to the price; -$X takes it off.

### Cam Selection

- TBW1777 - Stage 1 Camshaft: no price change: `choice/3-855`
- TBW0473 - Stage 2 Camshaft: no price change: `choice/3-856`
- TBW1775 - Stage 3 Camshaft: no price change: `choice/3-857`
- TBW0577 - Stage 4 Camshaft: no price change: `choice/3-858`

## 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 > Z125 PRO](https://tboltusa.com/store/japanese-mini-bike-parts-z125-pro-c-100_1031.md)
- [TB Parts > Z125 PRO](https://tboltusa.com/store/tb-parts-z125-pro-c-68_1091.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)

This a great, potent upgrade for those who already have a TB 143cc, 165cc, or 178cc bore kit. It adds the race head V2 and intake kit to your existing bore kit to deliver a greater level of performance.

**Key Features:**

- Forged anodized aluminum roller rockers
- Huge 30mm intake and 24.5mm exhaust valves
- Stainless steel valves (21-4N material)
- 27mm intake port, 23mm exhaust port

**Kit Includes:**

- TBW1224 - Intake Kit
- TBW0645 - Cam sprocket
- TBW0459 - V2 head
- TBW1777 or TBW0473 or TBW1775 or TBW0577 - Camshaft

**Note: MUST BE USED WITH AN AFTERMARKET FUEL CONTROLLER TO PREVENT A LEAN CONDITION AND DAMAGE TO YOUR ENGINE WE RECOMMEND PREMIUM FUEL**

## More notes the store shows with this product

**Camshaft Selection info:**

TBW1777 - Stage 1 Camshaft - Best low end to midrange
TBW0473 - Stage 2 Camshaft - Great low end to midrange with more over-rev
TBW1775 - Stage 3 Camshaft - Good low end, better midrange to top end
TBW0577 - Stage 4 Camshaft - Best midrange to top end with best over-rev

## 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/10746/tbparts-143-165-178cc-v2-race-head-and-intake-upgrade-kit-1.png)

## 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.