98' WR400...BROKEN VALVE NEEDLE.......HELP !!!!!!

My buddies 98' wr400 has cracked and broken 2 valve needles, (the flat metal piece that sits in front of the slide in the carb.) since he's owned it. any ideas on what would cause this ? at about $100 apiece, and the chances of metal going thru the motor.. he needs to find an answer to this problem. thanx. :)

Does he have a functioning throttle stop?

I do not, and I also have cracked two of those things. I keep putting off replacing mine, and cutting it to the proper length.

i'm pretty sure his throttle stop is there, and cut.

any ideas on what would cause this?

Have the slide rollers worn a groove inside the carb body?

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