Will a BBR TTR50 fork kit fit on a TTR90?
Same question for the swingarm.

Thanks

did you ever work this out?  I just put a TTR90 swing arm on a 50 - it fit ok - had to weld a piece for the brake drum to mount and spacers where the shock mounted. so they are pretty compatible. I wanted a longer swing arm on the 50 - not sure why you would want a shorter one on a 90 unless you are looking at after market swingarm. the 90 was about an inch longer than the 50's.