FUBAR was an ongoing project that was started in 1972, and progressed to 1976 KR750. What a lot of people don't realize is, there were only 5 triples built with this rear swing arm setup (I have one of the H2R chassis), but, two more were done to KX450 air cooled motocross race bikes that Weinert and Lackey tested for us, with only one done for a Six Day's Trials bike, by Walt Axthelm in the R&D Department.
FUBAR worked well, didn't squat was much as a single arm with two shocks. It's real intent was to stop the squat, and keep the chain in one plane to keep it adjusted through the entire swing arm arc. If you look at a single arm today, the chain gets slack at full high and full low of the arc, with just right in the center of the arc to the front sprocket.
As far as I am aware, no FUBAR triple was ever raced in any road race, only tested in closed sessions.
One of the strangest setups back then was the leading link rocker front end on production BMW's, which had a single swing arm. If you rode one and played between acceleration and front wheel braking, you'd have sworn you were riding a rocking chair. On acceleration, the rear end would lift, and the front would squat seriously. Reverse it, off power, apply front brake, front end went skyward, rear end squatted. If you played with the throttle and front brake the right way, it looked like you were riding a rocking chair.
In later years, one of the Kawasaki guys from R&D went to work running the nuts and bolts end of the US Factory Yamaha Super Bike Team. His specialty research was in getting the bike to have a falling rate suspension, not the regular rising rate usually had. the idea was to get the bike to squat down on both ends, going into and through a turn, instead of the bike reacting the other way into the turn. This would make the chassis be more stable into the turn than rising the chassis up. He never did get it to work the way he wanted, but, it is common Super Bike and MotoGP suspension tech today.
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