Fighter,
glad I could finally chime in here with so help for someone :) .
The 65 has a stock pipe, the only real prep is to keep the filter
clean. Been thinking of those filter skins for ease of use. We do check the water level in the radiator before each ride. I would probably try sticking w/ stock gearing for a 60 at first w/ a paddle and see how it does. I believe the one we have is a 6 paddle, I know mine cr250 is an 8.
Ya 80/85's are kinda tall, my son is kinda short. He really likes the expert modes due to the bigger wheels rollin easier.
There are very few kids on bikes in the big bowls, and we always get a thumbs up. Alot of kids are on blasters,300ex and 400's. I a;so see a bunch of kids ridin dads 450's and banshees. I HAVE A PROBLEM WITH THAT. :| Different rant thought.
Anyway sorry to carry on, but We absolutely love the dunes. By the way we also go to the Cinder Hills in Flagstaff. They got hills that make Glamis look like an ant hole. :yikes:
Brian