I used this site to find the best jetting for my wife's TTR-125 and it runs great now! But the boy's TTR-90 is jetted stock, which is just awful. I've cleaned the carb a few times and put a new plug in it, but it still won't run right, even when re-assembled per the manual. It runs OK on the choke (idles too high), but won't idle off the choke and dies when you snap the throttle from idle. It will run well at the mid- and upper revs, but he spends most of his time at putt-putt speeds in 2nd gear, so I need it to run well down low. Is there a preferred jetting set up for the 90 for use at or around 1000' ASL?