Had a couple of days off so decided to rebuild the top end of my WR 400 (2000) new timing chain, 420 cylinder and piston, hotcams and yz header. Just got her running and man do I like that auto de-compression. Easy starting now. Jetting stayed the same just had to turn it 1/4 turn on the idle and all is well. I am stoked, can't wait to go on a good ride now. Feels like a new bike, can't quite get on it hard yet but break in should not take too long. Oh and don't drop the half moon valve cover clip down the timing chain into the case. Creates a wee bit of a cussing storm.