I always wanted to do a Triumph chopper. The closest thing I have to that is THIS one. It is a 2002 Triumph America that I have owned since 2012 [I think]. It is the 790cc air cooled. Lots of aftermarket and some home made pieces. Runs great. Probably one of the most reliable bikes Triumph has ever made. But would like to do a chopper based on a motor like this. ...J.D.
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I almost pulled the trigger on a custom 650 Bonnie chopper that had the frame with the integrated shock springs on either side of the axle rather than typically mounted shocks. Combined with a nice spring mounted leather seat, it actually road pretty well over bumps, but it had an overly-extended front end that I didn't like the handling feel, so I passed on it.
As for my transaxle fluid recommendation, I actually did a bit of research both here and other forums, and some contact with Mitsubishi. IIRC, 90w is the recommended weight, but as with engine oil, that can be adjusted to account for driving conditions and ambient temperature. Dropping down from 90 to 85w is not going to significantly affect parts protection level, but it does make it easier and smoother to shift, especially in extreme cold climates. You used to only have a choice between 80 and 90w, but Redline came out with the MT-85 to fill the niche of trannys similar to the 3G, with additives that are not harmful. I was told that it was specifically made for the 3G tranny. Can't say for sure if that's true, but I can vouch for the results. I also read somewhere about someone doing an oil analysis with positive results. But to your point, it is NOT as readily available and typically goes for like $20/quart, but hey, nobody is changing their transaxle fluid that often to make this choice cost prohibitive. As a disclaimer, I should mention that at the time I switched to Redline, I also installed a short shifter and new poly shifter mount bushings, but even so, the most noticable difference is better cold weather shifting, which I can definitely attribute to the fluid alone.