engine noise after valve adjustment

[RideRed27]

i have a 06 450 and i jus adjusted my valves, the right intake was the only one out of spec, and i started and it started quick and ran good but there is a loud rattling coming from the top of the engine it sounds like and was curious what this is? it never sounded like that before

thanks

[biketrdr]

how did you figure what shim to use. my sons freind did his and put the wrong shim in. sounded like a tap dancer

[RideRed27]

i went to my shop and a mechanic there got me the right shim to put in and the clearances now are perfect