My son has an XR600R with a Mikuni 41mm vacuum carb; it's junk. He's looking to replace it without spending a furtune. Wondering about the TM40 pumper that's used on the DR650. Anyone have any experience getting one jetted for an XR600R. Any other suggestions? We're sorta desperate - his current carb is totally unreliable, and we're doing the Eastern Sierras at the end of this month.
Thanks!