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Motor Scooter Engine Codes Reference
Engine Specifications
| Engine Code | Displacement | Cooling Type | Engine Style | Common Models / Notes |
|---|---|---|---|---|
| GET | 49cc | Liquid-cooled | Horizontal, 4-stroke | Honda Ruckus, Metropolitan. Ultra-reliable, low-speed, hard to mod without full swap. |
| 139QMB | 49cc | Air-cooled | Horizontal, 4-stroke | Most common Chinese 50cc engine. TaoTao, Peace Sports, etc. |
| 1P39QMB | 49cc | Air-cooled | Horizontal, 4-stroke | Performance version of 139QMB with taller cylinder head. |
| 152QMI | 125cc | Air-cooled | Horizontal, 4-stroke | GY6-style engine. Used in Jonway, BMS, and other Chinese scooters. |
| 157QMJ | 150cc | Air-cooled | Horizontal, 4-stroke | Most common GY6 150cc engine. Widely used in Chinese scooters. |
| 1P57QMJ | 150cc | Air-cooled | Horizontal, 4-stroke | Performance version of 157QMJ. Taller head, better cam profile. |
| 161QMK | 175cc | Air-cooled | Horizontal, 4-stroke | Less common, used in upgraded GY6-style builds. |
| 164FML | 200cc+ | Air-cooled | Vertical, 4-stroke | Found in dirt bikes and larger scooters. Not GY6-compatible. |
| 170MM | 250cc | Liquid-cooled | Vertical, 4-stroke | Used in maxi-scooters and ATVs. More torque, better for touring. |
| 1P70MM | 250cc | Liquid-cooled | Vertical, 4-stroke | Performance version of 170MM. Taller head, tuned cam. |
Engine Code Breakdown
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First digits (e.g., 139, 152, 157): Refer to bore and stroke configuration.
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Q: Indicates forced air cooling.
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M: Denotes motorcycle-style engine.
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B, I, J, K: Represent displacement class
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B = 50cc
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I = 125cc
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J = 150cc
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K = 175cc
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P prefix: Indicates a performance head—taller cylinder, improved cam seating, better airflow.
Honda Ruckus Engine Overview
The Honda Ruckus uses a 49cc liquid-cooled, 4-stroke, single-cylinder engine known as the GET engine (Gas Engine Type). It’s compact, fuel-efficient, and horizontally mounted—but it’s not part of the GY6 or QMB139 family commonly found in Chinese scooters.
Due to its limited mod potential, many Ruckus enthusiasts opt for a GY6 swap, typically upgrading to a 157QMJ or 1P57QMJ for more speed and customization options.
Compatibility Notes
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QMB139 and GY6 50cc engines are not interchangeable with the Ruckus without a full engine swap.
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Aftermarket parts like kickstart levers may be marketed as compatible with both QMB139 and Ruckus, but this usually applies to external accessories—not internal components.
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Vertical engines like 164FML and 170MM are better suited for off-road or touring builds and are not plug-and-play with standard scooter frames.
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