It has just recently started to "slip out of gear" or that's at least what it sounds like. I have taken the entire tranny out and pull the case apart thinking that it might be a stripped gear, but I didn't see any gears missing teeth. I have taken the slipper clutch apart and cleaned it and tried to adjust it but I have had no luck. It seems to do it the most when shifting from 1st to 2nd. It also does it when the engine revs high. I have no idea what to do.
Sounds like the one way bearing in the tranny shifting mechanism is shot. Try replacing it. I bet it will cure your problem.
"I like rc cars"....."WHAT? YOU'RE KIDDING!"
I agree with upbasher. There's a small pin that wil break and you can't get just the pin. The kit is about 7 bucks. I made another pin the second time it happened to me and so far so good.
Not a great picture but this may be what you find
I got one from a local hobby shop. Part # 5396x. I used a presto pin and cut it to length as a temporary fix... 6 months ago.