Don't forget for overkill they made a double row chain kit also. Breakin' chains was a big deal in the early bikes. Picture in this thread - http://forums.sohc4.net/index.php?topic=29164.0
Omigosh, I remember those! They had REAL short life because they were hard to lube very well. Choppers often sported them in shows, though. I saw a few at the drags back when, but they were said to "lose ET" compared to a single chain.
Does anyone remember the short-lived Gates Toothed [rubber] Belt setup, with the special aluminum toothed sprockets and all? A friend of mine back then worked in the Gates R&D shop when it was here in Denver, making those belts and the 2-piece sprockets. They were prototyped on a Sportster 1000cc (1973, his own bike) and they built a radio transmitter that received the strain-gage readings wirelessly (this was a BIG deal technology in the late 1970s when they were R&D-ing these drive systems) from the 2 sprockets' built-in strain gages. It transmitted to a receiver on the Sporty, which relayed it to my friend's car where it was recorded on a strip-chart recorder, specially modified to work in his Chevy Blazer. The car followed the Sportster from Denver's factory to Dillon in the mountains, thru the Eisenhower Tunnel, then back again. A year later the improved belt and pulleys appeared for the CB750, 2 different H-D bikes and Kawasaki asked for it in their 400 Twin, which became the first production bike to get one. The CB750 shredded the belt, though, because it made too much power during the uphill climbs: the H-D had a pulsing power profile while the Honda simply leaned on the belt all the time. They made 3 sets for the 750 and never marketed it, as these had to be 2-piece countersprockets that bolted together in-place on the engine, very hard to install and also make round. This began the rubber-band drives that we see nowadays, copied by the Japanese in the 1990s when Gates Rubber bailed out of it. Gates never made $$ on it, sold it to Dayton, in Japan.
