Cylinder kit ATHENA Big Bore Kit 144cc Ø58 YAMAHA YZ 125 2005-2021

Net Weight (Kg):1.50
Compression ratio:14.0:1
Augmentation (mm):+ 4
Displacement (cc):144
Bore (mm):58.00

• Aluminum cylinder with nickel carbide coating and aluminum cylinder head with removeable bronze dome
• Specially designed, high performance, hard anodized power valves (cannot use OEM)
• Kit also includes Athena top end gasket set with required seals and hardware
• Piston kit includes cast lite flat top piston, rings, clips and pin
• May require case boring.

Fit the models: