As the specifications for all 4 stroke single cylinder motocross and quads are similar the following prices and engine specs are the same.
Honda CRF250 & 450, Kawasaki KXF250 & 450, Suzuki RMZ250 & 450, Yamaha YZF250 & 450 and also quads using same or similar engines e.g LTZ250 &450
Gasflowed cylinder head £200.00
High Compression Piston £120.00
Gaskets £20.00
Race Camshafts £160.00
Race Valves, Springs, Retainers per set £200.00
Labour to strip and build, set valve clearances, etc £200.00
Dyno time to run in and setup £60.00
For any fuel injected machine e.g LTZ450 Powercommander £220.00 - Dyno time and custom map £120.00
Call for prices on 2 stroke machines.