63mm 180cc Big Bore Kit for GY6 125cc & 150cc
ITEM# TT-24998
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Description
63mm Big Bore Kit for GY6 125cc and 150cc Engines
This big bore setup raises the displacement of a GY6 engine to 180cc, which adds low-speed pulling power and helps on hills. It suits GY6 125cc and 150cc engines and can be fitted to scooters, recreational vehicles, small cars, and a range of utility machines. If you are browsing GY6 150cc scooter parts, this is one option that can noticeably boost performance. The engine case must be bored out to suit this upgrade before fitting.
Full Top-End Set
Everything needed for the top end comes in the box: cylinder, piston, circlips, piston ring set, and gaskets. The cylinder has cooling fins to help shed heat, which matters under heavy use. Having all parts in one kit makes the upgrade more straightforward.
What the Case Needs
The engine case has to be bored to accept the 64.9mm sleeve of the cylinder before anything goes on. Skipping this step can damage the cylinder. You should also think about re-jetting the carburetor or fitting a larger performance carburetor so fuel delivery keeps up. A performance camshaft paired with this kit can add further gains.
Specifications
- Bore: 63mm
- Displacement: 180cc (with stock 57.8mm stroke)
- Sleeve Outer Diameter: 64.9mm
- Cylinder Height: 90.5mm
- Stud Spacing: 54mm
- Includes: Cylinder, piston, 2 circlips, 5-piece ring set, base gasket, head gasket
- Replacement Rings: 63mm Piston Ring Set
- OEM Part Number: OPS 164-310
- Fits: GY6 150cc (157QMJ) engine; case boring required on all applications
Fitment
Fits:
- GY6 150cc (157QMJ) (54mm stud spacing, case boring required)
How to choose: Look up the engine code stamped on the engine case. This kit is listed for the 152QMI, 157QMJ, 161QMK, 1P57QMJ, 1P61QMK, YN1P57QMJ, JJ157QMJ, BN157QMJ and BN161QMK-A codes.
Where it goes: Part #1 on the cylinder diagram for the GY6 150cc (157QMJ).
Other versions: For the NCY 61mm no-cut kit for 171cc GY6 engines, see GY6 61mm 171cc No-Cut Big Bore Kit.
Shop more: GY6 150cc Scooter Parts (157QMJ) · GY6 Scooter Parts · Scooter Big Bore & Cylinder Kits · Scooter Parts
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