Yamaha TZR 250 CNC Cylinder head modification CB Tuning have improved the standard TZR Cylinder head. The modification includes adding O Rings to the head, which allows the head to be taken on and off, without the cost of a head gasket. The Head is supplied with the correct length studs, Dome Nuts and copper washers.
The Combustion Chamber has been redesigned with improved shape, squish and Compression Ratio. The New design brings the spark plug closer to the piston matched with a perfect spherical dome to improve combustion efficiency. The Squish band has been matched to the standard piston shape and the clearance reduced to 0.9mm.
Specification
CR 14.1:1
Squish Clearance 0.9mm
For a head exchange, including studs and O rings £150
