- Big Bore Kit
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- Big Bore (42)
- Big Bore Kit (167)
- Big Bore Top End Kit (6)
- Block Cylinder (6)
- Complete Cylinder (29)
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- Cylinder Barrel (58)
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- Cylinder Head (5)
- Cylinder Kit (75)
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- Engine Rebuild Kit (174)
- For Linhai Lh300 (5)
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- Piston Kit (104)
- Top End Kit (9)
- Top End Rebuild Kit (42)
- Other (3217)
- Unit Type
For Yamaha XMAX300 80mm Big Bore Cylinder Piston Gasket Kit
This complete big bore top-end cylinder kit is designed for Yamaha XMAX300 (2017-present) and related 292cc liquid-cooled 4-stroke single-cylinder engines (Blue Core, DiASil cylinder). The OEM standard bore is 70.0mm. This 80mm cylinder kit is a. Engine specifications after upgrade: piston diameter 80.0mm (big bore from OEM 70.0mm), stock stroke 75.9mm remains.
The kit includes: 80mm cylinder block (aluminum alloy), 80mm piston (forged), piston rings (2 compression + 1 oil), wrist pin, circlips, and full top-end gasket set (cylinder head gasket, base gasket, O-rings). Professional installation recommended for complete top-end rebuild. ECU tuning / fuel controller and upgraded fuel injector e. 300cc-350cc class strongly recommended for optimal performance with significantly increased displacement.
Important: OEM standard bore is 70.0mm - 80mm is a big bore performance upgrade, not standard size. Professional engine building experience strongly recommended. Ideal for restoring lost compression, eliminating blow-by, increasing power, and refreshing top-end performance on XMAX300 engines. Perfect for maxi-scooter performance tuning, long-distance touring, and engine rebuilding.