# TBparts - 20mm Carb Z50, CRF50, XR50, CT70, XR75

> 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) > [Honda Vintage Mini Bike Parts](https://tboltusa.com/store/honda-vintage-mini-bike-parts-c-101.md) > [XR75](https://tboltusa.com/store/honda-vintage-mini-bike-parts-xr75-c-101_963.md) > TBparts - 20mm Carb Z50, CRF50, XR50, CT70, XR75
- **Web page:** [this page on tboltusa.com](https://tboltusa.com/store/tbparts-20mm-carb-z50-crf50-xr50-ct70-xr75-p-280.html)
- **Markdown:** [this page as markdown](https://tboltusa.com/store/tbparts-20mm-carb-z50-crf50-xr50-ct70-xr75-p-280.md)
- **Generated:** 2026-10-31 20:39 EDT
- **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=280`

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

## Summary

- **Part number:** TBW0125
- **Price:** $61.99 USD
- **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=280&stockcheck=true) ([Contact us](https://tboltusa.com/store/contact_us.md))
- **Reviews:** [3 reviews, average 5 of 5](https://tboltusa.com/store/reviews/tbparts-20mm-carb-z50-crf50-xr50-ct70-xr75-pr-280.html)
- **Product id:** 280
- **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.

- [Honda Vintage Mini Bike Parts > XR75](https://tboltusa.com/store/honda-vintage-mini-bike-parts-xr75-c-101_963.md)
- [Pit Bike Engine Parts > Carbs and Jets](https://tboltusa.com/store/pit-bike-engine-parts-carbs-and-jets-c-51_528.md)
- [TB Parts > CRF50 XR50 Z50 88-Up > CRF50 XR50 Carb Kits and parts](https://tboltusa.com/store/crf50-xr50-z50-88-up-crf50-xr50-carb-kits-and-parts-c-68_73_1046.md)
- [TB Parts > CRF70 XR70](https://tboltusa.com/store/tb-parts-crf70-xr70-c-68_77.md)
- [TB Parts > CT70 > CT70 Carb Kits and parts](https://tboltusa.com/store/ct70-ct70-carb-kits-and-parts-c-68_75_1040.md)
- [TB Parts > Chinese Engines](https://tboltusa.com/store/tb-parts-chinese-engines-c-68_70.md)
- [TB Parts > SL70 XL70](https://tboltusa.com/store/tb-parts-sl70-xl70-c-68_76.md)
- [TB Parts > XR100 CRF100](https://tboltusa.com/store/tb-parts-xr100-crf100-c-68_80.md)
- [TB Parts > XR75](https://tboltusa.com/store/tb-parts-xr75-c-68_78.md)
- [TB Parts > XR80 CRF80](https://tboltusa.com/store/tb-parts-xr80-crf80-c-68_79.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 20mm carburetor that fits a variety of Hondas such as the Z50, CRF50, XR50, and CT70 **with** 88cc big bore kits. Good replacement carburetor for 72cc-125cc 4 stroke engines. Direct bolt-on for Honda XR75 from 1976-1978, but choke lever is not extended like original. Can be replaced with the original lever if wanted.

Takes Keihin main jets:

KEIHIN ROUND JETS (SMALL) 99101-116 (Same as Stock KLX110)

**Note:** 6mm thread allows for use of TRC-1096 if needed

**Specifications:**

- Stock main: 89
- Stock pilot: 35
- Air filter Size: 1.25in
- Silver screw for idle adjustment
- Brass screw for Air / Fuel fine tune adjustment

**Support parts not included:**

- Pilot jet kits - TRC-2376/TBW0798/TBW0478
- Main jet kit - TBW0294
- Rebuild kit - TBW0275
- Air filter - TBW0398

## 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/280/tbparts-20mm-carb-z50-crf50-xr50-ct70-xr75-1.3688689c.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.