Polini Big Bore Kit; 4T Vespa Primavera, LX 50, Fly 50 & P50
Polini Big Bore Kit; 4T Vespa Primavera, LX 50, Fly 50 & P50
$349.67
8 in stock
*Note: Free shipping to U.S. mainland (excludes AK, HI, and territories)
Orders placed by 1pm EST on weekdays ship the same day.
Product Details
Description
Polini Big Bore Kit; 4T Vespa Primavera, LX 50, Fly 50 & P50
Key Details
- 140.0223
Compatibility / Fitment
Use the fitment details below to confirm this part matches your scooter before ordering.
- Engine Size: 4-Stroke
- Fits Models / Common Applications: Vespa and other compatible models may apply.
- Fitment Notes: Big Bore
Fitment Guide: This compatibility information is based on manufacturer and supplier data. Listed models are common known applications and may not include every compatible scooter. If your scooter has multiple versions or production changes, confirm the correct match before ordering. Check photos, measurements, original part numbers, engine code, model, and related fitment information whenever possible.
Common Fitment Questions
Q: Will this fit a Vespa?
A: This SKU is listed with Vespa model fitment where the scooter also matches the listed engine or fitment notes.
Q: Is this for 4-Stroke scooters?
A: This SKU is listed with 4-Stroke engine-size fitment. Confirm exact model, year, and part style before ordering.
Additional information
| Weight | 2.5 lbs |
|---|---|
| Dimensions | 9 × 8 × 6.5 in |
Bump your Piaggio 4T 50cc scooter to 78.8cc with the Polini Big Bore Kit. Designed for 4-stroke 2-valve and 4-valve 49cc Piaggio engines, this complete kit includes a finned aluminum alloy cylinder, flat-top piston, full gasket set, and all hardware needed for the bore-up. The 11.6:1 compression ratio delivers a significant increase in mid-range and top-end power, and the included gear-up ratio (14:43) provides a 60% increase over stock (11:54) for improved top speed.
For off-road and closed-course competition use only. Not intended for use on public roads or land. Not legal for use in California on pollution-controlled vehicles. Performance upgrades are not covered under warranty.
Kit Contents
- Finned aluminum alloy cylinder (78.8cc bore)
- Flat-top piston
- Piston rings (3-ring set)
- Circlips (x2)
- Wrist pin and dowel pins
- Head gasket (green composite)
- Base gasket (black)
- Exhaust gasket
- Rubber intake manifold spacers
Technical Specifications
- Displacement: 78.8cc
- Compression Ratio: 11.6:1
- Gear-Up Ratio: 14:43 (60% increase over stock 11:54)
- Cylinder Material: Aluminum alloy
- Polini Part Number: 140.0223
- Made in Italy
- Vespa LX 50 (2006–2009) — 4-stroke 2-valve
- Vespa LX 50 (2010–2014) — 4-stroke 4-valve
- Vespa S 50 (2009–2014) — 4-stroke 4-valve
- Vespa Primavera 50 4V Carb (2015–2019)
- Vespa Sprint 50 4V Carb (2015–2019)
- Piaggio Fly 50 (4T)
- Scootcoupe P50
