I just moved the 90s out of the shop to get to the Superhawk and go to COTA for the MotoGP smackdown that Marc laid out. I also took the XR650 on fri.
Tonite I'm charging my new Yuasa for the 90s. The other 90 battery has a dry spot in one of the cells. Can't be good.
I also adjusted the yellow 90s carb to match the red 90 since it actually fired off a little. Combine with new battery and maybe we get somewhere. I have three Trail 90s and I've still never ridden one!