SLEEVE RM250 89-90

Cylinder Sleeve For 2-Stroke

Engineered specifically for 2-Stroke high-RPM powersports applications

Scavenging, transfer, and exhaust ports come factory pre-profiled to preserve exact original manufacturer timing parameters

Centrifugally spun-cast Chrome-Moly Alloy (200 Brinell hardness) for superior heat dissipation and ring wear life

Supplied semi-finished; must be finish-bored and honed after installation to match the exact clearance specifications of the replacement piston

Inside diameter must be bored and honed to size piston after installation.

Type AC (Alloy-Chrome / Nikasil): Factory aluminum cylinder has a thin plated coating. The original bore must be precisely machined out to accept this iron sleeve press-fit upgrade. For liquid cooled engine.