shifting problems
 

i have a 1985 honda 110 atc. i have noticed that when the motor gets hot it will slip out of gear. at first i thought the oil was too thin so i went from 10w30 to 10w40, past this i dont know what to do please post back

shifting problems
 

use motorcycle oil. car oil is not good for the clutches did you adjust the clutch.

shifting problems
 

My sons ATC70 had a similar problem. turned out the part which holds the damn thing in gear was broken.
It was called a 'shift drum stopper'. (Im sure the 110 has a similar part)

here is a pic (for the 70) -> http://dratv.stores.yahoo.net/70shdrst7.html

you'll need a book to open er' up - if you want to be able to put it back together.