Yeah, it was extreme Ithink too. I'm sure some was how we ran the engines, but O.S. replacement bearings were just fair quality too. There use to be a nice aftermarket replacement for those motors back in the 90's that would last longer, and was real smooth.

Also we ran tuned pipes almost always on them.

There is also a difference not mentioned yet here with this motor group/erra, some had ABC piston/sleeves, where others had the standard nickle whatever. Though not anything related to a fuel issue..

Ican tell you though, we were not the only people that 'were hard on' bearings.


Yeah, id try running it with a stock backplate too, with muffler pressure. cant hurt while your waiting for parts.