# Piranha - 140cc Bottom Electric Start Semi-Auto E-Start Engine

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

## Summary

- **Part number:** WHS-3284
- **Price:** On sale: $599.00 USD (regular price $734.42 USD). (before options)
- **Stock:** In stock.
- **Reviews:** [2 reviews, average 5 of 5](https://tboltusa.com/store/reviews/piranha-140cc-bottom-electric-start-semi-auto-start-engine-pr-10616.html)
- **Product id:** 10616
- **Product last changed:** 2026-11-02

## 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.

### Exhaust Gasket

- None: no price change: `choice/101-773`
- COPPER TYPE TRC-1189: +$2.99: `choice/101-772`

### Shipping

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

- Flat Rate: +$85.00: `choice/8-26`

### Uni Air Filter

- No Air Filter: no price change: `choice/91-731`
- Uni Air Fliter: +$22.95: `choice/91-732`

## 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 > Piranha Engines](https://tboltusa.com/store/engines-piranha-engines-c-114_115.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 is the newest offering from Piranha! The same great, dependable YX 140cc motor with an electric start option and a semi-automatic transmission. Starter motor mounted on bottom.

**IMPORTANT:**

- This engine has difficulty being put into a Motoped due to pedal clearance issues.
- If running TRC-4958 pegmount, please see "recommended" below
- Replacement starter motor WHS-0394 (2 bolt style)
- The engine is slightly wider in the lower rear and may cause clearance issues with over the top brake pedals such as on the SSR SR125

**Engine Kit Includes:**

- Engine
- Intake
- CDI
- Coil
- Harness
- Kicker
- Shifter
- Carburetor
- Wiring kit - WHS-4179
- Solenoid
- Voltage regulator

**Recommended:**

- TRC-4958 - Pegmount
- AS75-16-32 - Pegmount spacers and bolts

**Note**: We suggest using an aftermarket exhaust to obtain maximum performance.

**Recommended for your application:**

**Tech:**

- Takes Keihin round jets series 99101-393 - TBW0327
- Takes Keihin 21 series pilot jets used in PJ, PWK, PD, and 20-32mm PE carbs - TBW0363

**Honda XR50/CRF50:**

- CRF50/XR50 tank spacer kit - TRC-1955
- Throttle cable - TBW0301

**Honda XR70/CRF70:**

- Throttle cable - TBW0301

**Honda CT70:**

- Dual feed petcock for ATC70 CT70 Z50 - TBW0133

**Honda Z50:**

- TBparts race petcock for Z50 69-78 - TBW0355
- TBparts 12 way rotating spacer 26mm - TBW1487

**Honda ATC70:**

- Dual feed petcock - TBW0133

**Not Included:**

- Skid plates
- Exhaust
- Air filter
- Throttle cable

ENGINE

- Displacement: 140cc
- Engine Type: Air Cooled, Single-Cylinder, 2-valve, 4-stroke
- Bore/Stroke: 56mm x 57mm
- Final Drive: Chain
- Fuel Delivery: Nibbi 19mm
- Fuel: Unleaded / 91 Octane
- Recommended Engine Oil: 10W-40 Petroleum Based (Nonsynthetic)

IGNITION

- Kick Start: Yes - 14mm type
- Electric Start: Yes
- CDI: Yes
- Auxiliary Output (lighting): Yes

TRANSMISSION

- Transmission: 4-Speed semi-auto
- 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.
- This item ships with its own flat fee: $85.00 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 [Piranha - 140cc Bottom Electric Start Semi-Auto E-Start Engine](https://tboltusa.com/store/piranha-140cc-bottom-electric-start-semi-auto-start-engine-p-10616.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/10616/choice/101-773/choice/8-26/choice/91-731/qty/1` starts one with this product (the first value of every option, qty 1), `https://tboltusa.com/cart/<cart_code>/add/item/10616/choice/101-773/choice/8-26/choice/91-731/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 Piranha - 140cc Bottom Electric Start Semi-Auto E-Start Engine in my cart](https://tboltusa.com/cart/open/item/10616/choice/101-773/choice/8-26/choice/91-731/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/10616/piranha-140cc-bottom-electric-start-semi-auto-start-engine-1.344adf6d.jpg)
- [Photo 2](https://tboltusa.com/store/img/p/10616/piranha-140cc-bottom-electric-start-semi-auto-start-engine-2.jpg)
- [Photo 3](https://tboltusa.com/store/img/p/10616/piranha-140cc-bottom-electric-start-semi-auto-start-engine-3.png)
- [Photo 4](https://tboltusa.com/store/img/p/10616/piranha-140cc-bottom-electric-start-semi-auto-start-engine-4.png)
- [Photo 5](https://tboltusa.com/store/img/p/10616/piranha-140cc-bottom-electric-start-semi-auto-start-engine-5.png)
- [Photo 6](https://tboltusa.com/store/img/p/10616/piranha-140cc-bottom-electric-start-semi-auto-start-engine-6.png)
- [Photo 7](https://tboltusa.com/store/img/p/10616/piranha-140cc-bottom-electric-start-semi-auto-start-engine-7.png)
- [Photo 8](https://tboltusa.com/store/img/p/10616/piranha-140cc-bottom-electric-start-semi-auto-start-engine-8.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.