RDLN 63mm 180cc Big Bore Kit - GY6 125cc & 150cc

Description

This RDLN 63mm 180cc Big Bore Kit takes a GY6 125cc or 150cc engine (based on the Honda GY6 design) up to 180cc for more low-end torque and stronger hill-climbing power. It's a complete top end in one box, a popular upgrade for scooters, go-karts, buggies and small utility vehicles running a GY6.

Case boring required: The cylinder sleeve measures 64.9mm on the outside, so your engine case will likely need to be bored out to fit it. Forcing the cylinder in without boring will damage it. Use the Engine Case Boring Tool (202-37) for the job.

Features

• 180cc displacement: 63mm bore with the stock 57.8mm GY6 stroke.
• Complete top-end kit: Cylinder, piston, wrist pin, circlips, ring set and gaskets.
• Finned aluminum cylinder: Deep cooling fins to help shed heat.
• Fits 54mm stud spacing: Made for standard GY6 125/150cc engine cases.

Specifications

• Part number: 1100-1438
• UPC: 812722026165
• Bore: 63mm
• Displacement: 180cc (with stock 57.8mm stroke)
• Sleeve outer diameter: 64.9mm
• Cylinder height: 90.5mm
• Stud spacing: 54mm
• Includes: Cylinder, piston, wrist pin, 2 circlips, 5-piece ring set, base gasket, head gasket
• Replacement rings: RDLN 63mm Piston Ring Set (1100-1463)
• Also listed as: OPS 164-310
• Brand: RDLN

Model Fitment

Case boring is required on all applications. Check the engine code stamped on your engine case to confirm fit.

Installation Notes

• Bore the engine case to fit the 64.9mm sleeve before installing.
• A bigger engine needs more fuel. Re-jet your stock carburetor or upgrade to a larger performance carb.
• A performance camshaft pairs well with this kit to make the most of the extra displacement.
• Break the engine in gently for the first few hundred miles.

This product is intended for off-road use only. This product is not intended for use on public roads or land.

Product Diagrams

• GY6 CYLINDER Callout 1