NCY
NCY Crankcase Decompression Kit - Genuine/GY6
Description
Reduce crankcase pressure and free up power with the NCY Crankcase Decompression Kit. Designed for Genuine Buddy and GY6-based engines, this kit replaces your factory dipstick with a high-flow breather system. By venting excess blow-by gases, crankcase air density drops — allowing the piston to move more freely through less resistant air on each stroke. The result is reduced parasitic drag on the crankshaft, more free-revving engine character, and lower risk of oil burn, blown seals, and gasket leaks. A straightforward upgrade for any performance build or high-WOT application.
Intended for off-road / performance use only. Not for use on public roads.
Key Features
- Reduces Crankcase Air Density: Venting blow-by gases lowers crankcase pressure, letting the piston travel through less resistant air for measurable power gains.
- Reduces Parasitic Drag: Less crankcase pressure means less drag on the crankshaft and freer engine revving.
- Protects Seals and Gaskets: Proper venting reduces the risk of blown oil seals, oil burn, and gasket leaks under sustained WOT.
- 27" Oil and Fuel-Resistant Tubing: 12mm ID / 18mm OD for flexible routing options.
- CNC Billet Aluminum Cap: Anodized 17mm filler cap/adapter with 18mm thread.
- Complete Kit: Tube, billet cap, stainless steel hose clamps, and billet engine case cap with o-ring seal included.
- Installation Tip: Route the breather tube upward toward the frame before pointing it down to prevent oil mist from escaping.
Specifications
- SKU: 1100-1282
- MPN: 633U02H
- Thread Size: 18mm
- Tube Length: 27"
- Tube ID/OD: 12mm / 18mm
- Cap Material: Anodized billet aluminum
Compatibility
| Engine Family | Compatible Models |
|---|---|
| Genuine Scooter Co. | Buddy 125, Buddy 150, Buddy 170i, Hooligan, Blur |
| GY6 50cc (QMB139) | 139QMA, 139QMB, 1P39QMB, 147QMD |
| GY6 150cc (QMJ157) | 157QMJ, 152QMI, 161QMK, 1P61QMK |
| Other Brands | TaoTao, Wolf, Icebear, Bintelli, SYM, KYMCO |
Product Diagrams
Features
Specifications
Thread: 18mm | Tube Length: 27" | Tube ID/OD: 12mm/18mm | Cap: Anodized Billet Aluminum | MPN: 633U02H
Model Fitments
Genuine Buddy 125/150/170i, Hooligan, Blur; GY6 QMB139 50cc and QMJ157 150cc engines; TaoTao, Wolf, Icebear, Bintelli, SYM, KYMCO
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Same day shipping for orders placed before 2PM (CST) M-F
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30-day return period on eligible items
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Flat-rate shipping for orders shipped to the 48 Contiguous United States.
