I remember reading about the RM-125 when it was first introduced...
I was motoring around on a SL-70 that I had spent the summer shaping up to putt around on and trying to jump it...not enough power...
Could barely pull a wheelie...
I still have the shop manual...it said to use compressed air to blow off parts after you cleaned them...all I had was lung power...gasoline dried pretty quickly, though...
If I had been able to access a torch and had some instruction in welding and brazing back then...things would have progressed a lot faster instead of at a snails pace....(sigh)...
Back then guys used goggles for eye protection from flash damage...
I did get to ride a Yamaha 125...two-stroke...once...don't know if it was a YZ....sucker was POWERFUL...my buddy was riding wheelies as far as the neighbors yard would let him...I do know that the factory offered a GYT-KIT to hop it up even more...higher compression head and some other items...
Those were the days...