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40mm Piston Ring Assembly Kit for 2-Stroke 49cc 50cc Jog Engine
40mm Piston Ring Assembly Kit for 2-Stroke 49cc 50cc Jog Engine
5.0 / 5.0
(1) 1 total reviews
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Product Overview
Restore the peak performance of your 2-stroke engine with this high-precision 40mm Piston Ring Assembly Kit. Specifically designed for the 50cc Jog (1E40QMB) and Y-Zinger platforms, this kit provides a complete top-end solution to recover lost compression and ensure smooth power delivery for scooters, dirt bikes, and go-karts.
Product Compatibility
This kit is widely compatible with Minarelli-style 2-stroke 50cc engines and Yamaha-clone small displacement bikes.
| Vehicle Type | Common Compatible Brands/Models |
| Scooter / Moped | Yamaha Jog 50, Yamaha Vino 50, Adly, Aprilia (selected models) |
| Dirt Bike | Yamaha PW50 (Y-Zinger), PeeWee 50, GMX 50 |
| Chinese Scooter | 1E40QMB / 1PE40QMB Engines (TaoTao, Roketa, Jonway) |
| Small Vehicles | 50cc 2-Stroke Gas Go Karts & Pocket Bikes |
Specifications
| Component | Metric Measurement | Imperial Measurement |
| Piston Diameter | 40mm | 1.6" |
| Piston Height | 38mm | 1.5" |
| Wrist Pin Diameter | 10mm | 0.39" |
| Wrist Pin Length | 33mm | 1.3" |
| Engine Type | 2-Stroke | -- |
Key Features
- Premium Aluminum Alloy: Constructed from high-grade aluminum for excellent thermal conductivity and resistance to high-temperature deformation.
- Optimized Scavenging Design: Specifically engineered for 2-stroke port timing to maximize airflow and fuel efficiency.
- Precision-Fit Rings: High-toughness piston rings ensure a superior cylinder seal and minimize friction for long-lasting engine life.
- Direct OEM Replacement: Manufactured to exact factory specifications for a seamless "drop-in" installation without modifications.
- Complete Rebuild Package: Includes the 40mm piston, wrist pin, compression rings, and circlips—everything needed for a top-end overhaul.
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Fitment FAQ
Will this part fit my specific model and year?
This cylinder piston kit is intended for This kit is widely compatible with Minarelli-style 2-stroke 50cc engines and Yamaha-clone small displacement bikes.; Vehicle Type; Common Compatible Brands/Models; Scooter / Moped; Yamaha Jog 50, Yamaha Vino 50, Adly, Aprilia (selected models); Dirt Bike; Yamaha PW50 (Y-Zinger), PeeWee 50, GMX 50. Key physical/spec details from the product data include Piston Diameter: 40mm, Piston Height: 38mm, Wrist Pin Diameter: 10mm. Use the compatibility table and product photos together before ordering.
Do I need to match the OEM part number?
Yes. If your original part has a stamped OEM or manufacturer number, match that number first before ordering. For this cylinder piston kit, also compare the bore diameter, piston-pin size, gasket pattern, stud spacing, engine code, stroke type, and cylinder height. This is especially important for Yamaha PW50 models because similar model names can use different parts by year or trim.
What models or situations does this part not fit?
Do not order this cylinder piston kit for machines outside the listed compatibility, or for units with different bore sizes, piston-pin diameters, stroke lengths, stud spacing, or gasket patterns. Do not rely only on the model name or engine size.
What should I check before ordering?
Before ordering, compare your original part with the photos and check the bore diameter, piston-pin size, gasket pattern, stud spacing, engine code, stroke type, and cylinder height. Recheck listed specs such as Piston Diameter: 40mm, Piston Height: 38mm, Wrist Pin Diameter: 10mm. If any connector, mounting point, size, or year detail is different, confirm fitment before installation.
The item was satisfactory. I wasn't aware that a big bore kit was put in so the 40mm piston and rings were too small.