# Works - Lifan 141cc Semi-Auto Engine

> 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) > [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) > Works - Lifan 141cc Semi-Auto Engine
- **Web page:** [this page on tboltusa.com](https://tboltusa.com/store/works-lifan-141cc-semi-auto-engine-p-5070.html)
- **Markdown:** [this page as markdown](https://tboltusa.com/store/works-lifan-141cc-semi-auto-engine-p-5070.md)
- **Generated:** 2026-11-04 04:53 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=5070`

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

## Summary

- **Part number:** TRC-5070
- **Price:** $1,512.79 USD (before options)
- **Stock:** 1 left.
- **Product id:** 5070
- **Product last changed:** 2025-06-25

## 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.

### Shipping

The "Shipping" option is this heavy item's own flat shipping fee; it is added to the item.

- Flat Rate: +$60.00: `choice/8-26`

## 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 > Motoped Engine options](https://tboltusa.com/store/engines-motoped-engine-options-c-114_927.md)
- [Engines > Works Engines](https://tboltusa.com/store/engines-works-engines-c-114_518.md)

Where a fitment line says "All", it means all years of the model named on that line, not all bikes.

## Notes the store shows with this product

**\*\*Signature required shipment\*\***

## Description (the store's own text)

**Note:** Each engine is built to order. Please allow 1 week lead time before the engine can be shipped.

Works engine build!

**Key Features:**

- Ready to rip (tuned and cycled motor)
- Added power
- Lower weight
- 50% stronger clutch
- Base engine - Lifan 125cc semi-auto engine
- Added 141cc aluminum cylinder big bore kit - TBW9067
- Added TB 9004 race cam - TBW9004
- Added TB H-D auto clutch kit - TBW0961
- Added 26mm VM26 Mikuni carburetor and matching intake kit
- Approximately 45 lbs with oil
- Front drive sprocket included (Takes Larger Shaft 20mm x 17mm Type)

**Kit Includes:**

- Engine
- Intake
- CDI
- Coil
- Harness
- Kicker
- Shifter

- Displacement: 141cc
- Engine Type: Air Cooled, Single-Cylinder, 2-valve, 4-stroke
- Bore/Stroke: 55mm x 57mm
- Final Drive: Chain
- Fuel Delivery: VM26-606 26mm Mikuni
- Fuel: Unleaded / 91 Octane
- Recommended Engine Oil: 10W-40 Petroleum Based (Nonsynthetic)

Ignition

- Kick Start: Yes
- Electric Start: No
- CDI: Yes
- Auxiliary Output: Yes

Transmission

- Transmission: 4-Speed semi-auto
- Shift-Pattern: Four-speed Transmission: N-1-2-3-4 (Four Up)
- Clutch: Semi-auto (no hand clutch)

**Note**:
When upgrading your Honda XR50/70, CRF50/70 to this engine you
may want to use order aftermarket footpeg mounts and tank spacers.
Also we suggest using an aftermarket exhaust to obtain maximum performance.

All of these items are available individually at TBoltUSA.com

$100 shop labor included
$100 test run and tune

## More notes the store shows with this product

**IMPORTANT ENGINE STARTING INFORMATION**

- You may want to consider setting up the bike on a stand for a solid starting location at first until your confident
- Turn on Both Fuel and Choke
- DO NOT open the throttle (do NOT turn the throttle)
- Move the starter down until it gets stiffer, your looking for top dead center
- Let the starter come back up and give a full strong swift kick ALL the way thru
- REPEAT (If necessary)
- DO NOT KICK RAPIDLY
- When warm just do not use the choke

Flooded Engine:
IF your flooded , pull the plug, kick it over about 10 times WITH THE PLUG OUT
Put in a NEW PLUG

For ease of starting:
You may want to consider our TRC EZ START HIGH PERFORMANCE CDI
Part No. TRC-9745

One more thing:
At times it helps to just crack the throttle a *tiny* bit to let air in.

## 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.
- This item ships with its own flat fee: $60.00 USD.
- 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 [Works - Lifan 141cc Semi-Auto Engine](https://tboltusa.com/store/works-lifan-141cc-semi-auto-engine-p-5070.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/5070/choice/8-26/qty/1` starts one with this product (the first value of every option, qty 1), `https://tboltusa.com/cart/<cart_code>/add/item/5070/choice/8-26/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.

To choose other values, swap in a `choice/` piece from the Options above; `qty/` sets the quantity. More products: add more `item/...` parts.

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 Works - Lifan 141cc Semi-Auto Engine in my cart](https://tboltusa.com/cart/open/item/5070/choice/8-26/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/5070/works-lifan-141cc-semi-auto-engine-1.jpg)
- [Photo 2](https://tboltusa.com/store/img/p/5070/works-lifan-141cc-semi-auto-engine-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.