Naraku QMB139 52.4mm Performance Cylinder & Head Kit
Naraku QMB139 52.4mm Performance Cylinder & Head Kit
$301.53
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
Naraku 139GMB 52.4mm Big Bore Cylinder & Head Kit | 89.3cc
Key Details
- NK100.52
Specifications
- Height: 36.3mm Compression Height (from center of wrist pin hole to top edge of piston): 20mm Non-emissions style head Intake valve: 23mm Exhaust valve: 20mm Intake Port Diameter: 20.8mm Exhaust Port Diameter: 18.7mm Uses Short 64mm Valve Stems QMB139 50cc/49cc , Various unlisted makes/models NOTE: replaces Cylinder Heads with 64mm Valves (Short Valve Style). Please see Related Items if you need 64mm valves. You may need to modify your engine case to accommodate the larger cylinder. Upgrades to 89.3cc Cylinder Bore: 52.4mm Cylinder Sleeve Outer Diameter: 54.4mm Wrist Pin Diameter: 13mm Total Piston Height: 36.3mm Compression Height (from center of wrist pin hole to top edge of piston): 20mm Non-emissions style head Intake valve: 23mm Exhaust valve: 20mm Intake Port Diameter: 20.8mm Exhaust Port Diameter: 18.7mm Uses Short 64mm Valve Stems QMB139 50cc/49cc , Various unlisted makes/models
Additional information
| Weight | 4.7 lbs |
|---|---|
| Dimensions | 7 × 7 × 9 in |
Compatibility / Fitment
Use the fitment details below to confirm this part matches your scooter before ordering.
- Engine Size: 49cc, 50cc, QMB139
- Engine Code: QMB139
- Fitment Notes: Big Bore, 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 QMB139 engine?
A: This SKU is listed as compatible with QMB139 engine-code fitment. Always compare your original part and scooter details before ordering.
Q: Is this for 49cc scooters?
A: This SKU is listed with 49cc engine-size fitment. Confirm exact model, year, and part style before ordering.
Additional information
| Weight | 4.7 lbs |
|---|---|
| Dimensions | 7 × 7 × 9 in |
