fuel mixture screw question

[blasterfreak99]

okay i got an 07 450er and i let my brother adjust the fuel mixture screw to see if he could get the bog out of it. anyways the tool got left on the screw, the screw fell out on the trail, i put another stock one in but when i started it up it fell out again after about 30 seconds of idling. my question is, is there a spring that is supposed to go in there or do i have another problem?

[the Z Man]

try riva original parts finder online.

[bluebaron]

Yes there is a spring.

[blasterfreak99]

okay thanks!

and yea i tried yamahoftroy but i couldnt tell by the pics if it had one and they had lots of springs listed so i still wasnt sure.

[d3ktrix]

A spring / washer / o-ring go on the end of the A/F screw.

I was installing an aftermarket A/F screw with a thumb knob the other day and I tore the o-ring screwing it in.
I dunno if I screwed it in too far or the o-ring was cocked or something, but it messed it up good.

[blasterfreak99]

okay thanks man!