# THUMPSTAR 70cc Engine Kit

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- **Breadcrumbs:** [Home](https://tboltusa.com/store/index.md) > [Engines](https://tboltusa.com/store/engines-c-114.md) > [All Horizontal Pit Bike Engines](https://tboltusa.com/store/engines-all-horizontal-pit-bike-engines-c-114_1034.md) > THUMPSTAR 70cc Engine Kit
- **Web page:** [this page on tboltusa.com](https://tboltusa.com/store/thumpstar-70cc-engine-kit-p-1073.html)
- **Markdown:** [this page as markdown](https://tboltusa.com/store/thumpstar-70cc-engine-kit-p-1073.md)
- **Generated:** 2026-10-31 10:19 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=1073`

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

## Summary

- **Part number:** TRC-1073
- **Price:** $600.00 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=1073&stockcheck=true) ([Contact us](https://tboltusa.com/store/contact_us.md))
- **Reviews:** [1 reviews, average 5 of 5](https://tboltusa.com/store/reviews/thumpstar-70cc-engine-kit-pr-1073.html)
- **Product id:** 1073
- **Product last changed:** 2026-06-11

## 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.

- [Engines > All Horizontal Pit Bike Engines](https://tboltusa.com/store/engines-all-horizontal-pit-bike-engines-c-114_1034.md)
- [Engines > Pitster Pro Engines](https://tboltusa.com/store/engines-pitster-pro-engines-c-114_117.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)

ENGINE

- Displacement: 72cc
- Engine Type: Air Cooled, Single-Cylinder, 2-valve, 4-stroke
- Bore/Stroke
- Valve Sizes
- Final Drive: Chain
- Fuel Delivery: Carburator **Sold Seperately or as Option (see Below)**
- Fuel: Unleaded Pump Gas (Run Premium When Available)
- Reccomended Engine Oil: 10W-40 Petroleum Based (Nonsynthetic)

IGNITION

- Kick Start: Yes
- Ignition Type
- Electric Start: no
- CDI: no
- Auxillary Output: Yes

TRANSMISSION

- Transmission: 4-Speed 4Up
- Shift-Pattern: Four-speed Transmission: N-1-2-3-4
- Clutch: Semi Auto

## 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/1073/thumpstar-70cc-engine-kit-1.jpg)
- [Photo 2](https://tboltusa.com/store/img/p/1073/thumpstar-70cc-engine-kit-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.