De-comp lever and rattle..

[shuriken]

Right then, I'm back ont the road on Tuesday after my 6 month ban and have been fettling with the bike. Sorted out my jetting, re-worked my wiring(XR600 only has about 10 wires- bliss!) and checked and adjusted my valves. Start up the bike, now 2 or 3 kicks not 20(!) and it ticks over......... with an annoying rattle from the top end. Now I've either adjusted the exhaust tappets too tight or too loose, because as I pull in the de-comp lever the rattle goes(no lose of rev's or performance?). What have I done wrong or need to adjust.

[AIRWOLF]

Sounds like you need to re-set the tappet clearance.

[shuriken]

Hmm, bugger! I think I must have not had the cam in correct position for adjusting the valve with de-comp.