Hi,this is my 2nd post so I hope I'm in the correct place. I have a wr426f,yz timing,jd jet kit,hindle exhaust system. I may have got a bit confused & bought the wrong cam to upgrade to auto decomp,the cam I bought is a hot cam 4022-1E yz/wr450 stage1 exhaust cam. I've opened the box & inside is a hot Cams card with on it part no 4022-1E,then at the bottom of the card is says- These cams will not work in the YZ/WR 400/426 because of sprocket differences. I'm sure I read somewhere on here that you time up the yz450 exhaust cams at the rear,& not on the sprocket dots(marks) as they're different. Should I have bought a stock YZ 450 03 exhaust cam & bought a specific hot cam wr426 auto decomp hot cam. Any info would be much appreciated.