My son and I have inherited my fathers 1990 R100RT. It was rebuilt before the "Tranny" went bad (for the second time). Dad dropped it of at a repair shop on his way to Florida several years back but never picked it up. So now we would like to find a tranny to fit so we can go to the National this summer in PA. My question is, what year tranny will fit in this bike? I have checked E-Bay. Any other place to find the correct tranny? FYI the 1990 has 160,000 on the clock. The 1984 R-80RT I want to ride to the national also has 160,000+ miles.