NCY 50mm Head & Base Gasket Set - 139QMB Big Bore

This NCY 50mm head and base gasket set gives your big-bore rebuild fresh sealing components so you can get back to enjoying your scooter's upgraded performance. Designed for the NCY 50mm, 81cc cylinder kit on compatible 139QMB engines, this two-piece set replaces the gaskets at the cylinder head and cylinder base.

Key Features

• Matched to your NCY kit: Replacement gaskets for the NCY 50mm big-bore kit, part number 1100-1237.
• Two sealing positions: Includes one cylinder-head gasket and one cylinder-base gasket.
• Rebuild-ready service parts: Refresh the sealing surfaces when servicing your matching big-bore cylinder assembly.
• Big-bore application: For the 50mm upgrade on compatible 139QMB / QMB139 four-stroke scooter engines, not the stock-bore setup.

Technical Specifications

• Brand: NCY
• Part number: 1100-1399
• Part type: Cylinder head and base gasket set
• Quantity: Two gaskets
• Cylinder kit bore: 50 mm
• Matching kit displacement: 81cc
• Matching cylinder kit: NCY 1100-1237
• Engine platform: 139QMB / QMB139 four-stroke

Compatibility

This set is for the matching NCY big-bore kit, not a standard 50cc cylinder. Match the gasket pattern to your cylinder and head before assembly.

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

• Replacement gaskets for NCY cylinder kit 1100-1237
• Includes one head gasket and one base gasket
• For the NCY 50mm 81cc big-bore setup
• For compatible 139QMB / QMB139 four-stroke scooter engines
• Not for stock-bore 50cc cylinders

Brand: NCY; Part number: 1100-1399; Type: cylinder head and base gasket set; Quantity: two gaskets; Cylinder kit bore: 50 mm; Matching kit displacement: 81cc; Matching cylinder kit: NCY 1100-1237; Engine: 139QMB / QMB139 four-stroke; Off-road use only

Compatible 139QMB / QMB139 four-stroke scooter engines equipped with NCY 50mm 81cc big-bore cylinder kit 1100-1237; not for stock-bore 50cc cylinders