Product Details
Description
RDLN Big Bore Kit (63mm, 180cc); GY6 150
Key Details
- Original Parts For Scooters SKU: 164-310
Specifications
- Height: 90.5mmnCylinder Sleeve Outer Diameter: 64.9mmnCompatibility:157QMJ-based 125cc / 150cc / 169cc engines with the following engine codes:nn157QMJn161QMKn152QMIn1P61QMKnnnYN1P57QMJn1P52FMIn154FMInJJ157QMJnnn1P57QMJnBN157QMJnBN161QMK-AnOther QMJ, QMK, and QMI modelsnnDon't see your engine listed? If the engine code includes "QM" or "FM", this product is compatible with your vehicle.About ScootsUSA: Since our beginning in 1989, ScootsUSA has become a major supplier of parts and accessories for vintage and modern scooters. We have everything you need, from wear-and-tear items like tires and oil filters to after-market parts from brands like Malossi, NCY, Prima, YSS, Dr. Pulley, and more.nnNOTE: NOTE: You may need to modify your engine case to accommodate the larger cylinder; the engine boring tool is available online (SKU 202-37).Specifications:nIncludes cylinder, piston, pin, circlips, rings, head gasket and base gasketnUpgrades to 180ccnBore: 63mmnOverall Height: 90.5mmnCylinder Sleeve Outer Diameter: 64.9mmnCompatibility:157QMJ-based 125cc / 150cc / 169cc engines with the following engine codes:nn157QMJn161QMKn152QMIn1P61QMKnnnYN1P57QMJn1P52FMIn154FMInJJ157QMJnnn1P57QMJnBN157QMJnBN161QMK-AnOther QMJ, QMK, and QMI modelsnnDon't see your engine listed? If the engine code includes "QM" or "FM", this product is compatible with your vehicle.About ScootsUSA: Since our beginning in 1989, ScootsUSA has become a major supplier of parts and accessories for vintage and modern scooters. We have everything you need, from wear-and-tear items like tires and oil filters to after-market parts from brands like Malossi, NCY, Prima, YSS, Dr. Pulley, and more.
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 | 3 lbs |
|---|---|
| Dimensions | 6 × 6 × 6 in |
Compatibility / Fitment
Use the fitment details below to confirm this part matches your scooter before ordering.
- Engine Size: 125cc, 150cc, 180cc, GY6
- Engine Code: 157QMJ
- 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 157QMJ engine?
A: This SKU is listed as compatible with 157QMJ engine-code fitment. Always compare your original part and scooter details before ordering.
Q: Is this for 125cc scooters?
A: This SKU is listed with 125cc engine-size fitment. Confirm exact model, year, and part style before ordering.
Additional information
| Weight | 3 lbs |
|---|---|
| Dimensions | 6 × 6 × 6 in |





