Our YZ250 modified heads are computer designed, CNC machined and dyno tested. They make more power everywhere than a stock head, resist detonation WAY better, make jetting much easier, are lower compression than stock so engine life is improved and cost less than an aftermarket head... What more could you want? This one is getting engraved with 'TSP' before being installed on a customers' engine. We can do this for any make and model no matter how new, how old or how badly damaged. Most heads ar