Does anyone know if the 250f cam is similar to the 426f exhaust cam. I have checked on Yamaha of Troys website and the two models I could look at showed almost an identical part number between the two bikes. The only difference was in the first three numbers which looked like they were changed only because of the year. If the 250f cams are the same it would be a cake walk to install auto decompression onto a 426 using a 03' 250f cam. I did not believe that the 450f and 426f cams would be the same since it appears they have changed the head significantly. Any Ideas?