The 125 run a slinger or direct oil feed to the RH bearing,best idea suzuki have had for years just like the larger bores do so but its an old engine so changing the Rh seal could prove benificial but the bottom end will be like factory... the 76 was the last of the non reed engines and the better of that series if your considering keeping the bore but just touching it up. perhaps stick it in a lighter frame as weight will kill its competition value, the 185 frame is lighter than the ts and TM 125 frame with better brakes(crap anyway) and 21' front wheel, and as CG has stated, One engine mount is all that needs altering. A decent pipe and larger carb with weight reduced to a three wire electric system and tabs removed plus plastic tank could have a quite a nice fun ride.