NCY Performance Cylinder Head (50mm, 81cc, Alloy); 139QMB
NCY Performance Cylinder Head (50mm, 81cc, Alloy); 139QMB
$179.25
10 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
NCY Performance Cylinder Head (50mm, 81cc, Alloy); 139QMB
Specifications
- Length: 64mm 6mm Intake Threads 6mm Exhaust Threads NOTE: Most GY6 stock cylinder heads have valves that are 69mm high and use a 69mm rocker arm. This cylinder head has 64mm high valves and will only work with a 64mm rocker arm. Please check the stock valve stem height before ordering.Compatibility:139QMB-based 50cc / 80cc engines with the following engine codes: 139QMA 139QMB 1P39QMB 1P39QMA-2 YN139QMB JJ1P39QMB 139FMA-2 BD1P39QMB BN139QMB 147QMD Other QMA models Other QMB models Don't see your engine listed? If the engine code includes "QM" or "FM" and you've ensured the valve height and rocker arm on your bike are 64mm, this product is compatible with your vehicle.About NCY: NCY is the aftermarket performance parts leader for most popular scooter brands including Honda, Yamaha, Genuine, Vespa, SYM, Lance, KYMCO, and GY6 / QMB powered scooters. Made in Taiwan with strict quality standards since 1997, NCY is ISO 9001 certified.Made in Taiwan.This product is intended for off-road use only.This product is not intended for use on public roads or land.This product is not legal for use in California on pollution-controlled vehicles. Check local laws before installing.*Performance upgrades are considered racing parts and are not covered by warranty. SPECIFICATIONS: Specifications: Cylinder Head Stud Space: 50mm / H: 60mm / Intake Port: 24mm / Exhaust Port: 22mm Valves: 21.5x64mm Intake / 19x64mm Exhaust / Stem: 5mm / (w/intake valves) H: 66.1
Compatibility
Fits many 139QMB-based 50cc / 80cc scooter engines. Confirm measurements, connector style, and engine family before ordering.
Replacement Part Details
Use this part when the original component is worn, damaged, missing, or no longer working correctly. Many scooter parts can look similar but use different sizes, plugs, brackets, thread patterns, or mounting styles, so careful comparison before purchase is recommended.
Additional information
| Weight | 2.021 lbs |
|---|---|
| Dimensions | 5 × 2.5 × 2 in |
Compatibility / Fitment
Use the fitment details below to confirm this part matches your scooter before ordering.
- Engine Size: 50cc, 80cc, GY6
- Engine Code: 1P39QMA, 1P39QMB, 139QMB, BN139QMB, YN139QMB
- Fitment Notes: Performance
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 1P39QMA engine?
A: This SKU is listed as compatible with 1P39QMA engine-code fitment. Always compare your original part and scooter details before ordering.
Q: Is this for 50cc scooters?
A: This SKU is listed with 50cc engine-size fitment. Confirm exact model, year, and part style before ordering.
Additional information
| Weight | 2.021 lbs |
|---|---|
| Dimensions | 5 × 2.5 × 2 in |
