Run GOOD oil in it, ditch the VRO if it has it still and premix it, and run ethanol free fuel and it should run for a LONG time still. Just make sure to decarb it as the biggest killer of 2 strokes is carbon buildup that causes a ring to stick.

what he said X a billion

i have had a old 70 jonno and the connecting rod bolt came loose and destroyed the engine ---i also have a friend the same thing happen to it both these engines were never touched from new---i was thinking the bolts may of strecthed or rods anyone have an answers

You normally only hear of this in engines that were rebuilt and the rod bolts re-used.

most of the time I've seen the rod bolts stretched or the rods broken, the piston had seized, causing the rod failure, Was it on the middle cylinder? I do know the two cylinder 40-55 hp had a history of rod failures(and lower unit issues)

What you you mean "decarb" it?

Google "Dunk's decarb method"

you can use mercury power tune or do a shock treatment of Yamaha ring free(or mercury carbon guard)