I've got one, partially disassembled. They are fascinating bikes. They are light. Around 400 pounds plus change. Suzuki claimed 50 HP (?) and with the variable mass crankshaft they pull easily from low revs. At higher revs the heavy "auxiliary" flywheel releases for snappy engine response. Even the camshafts are hollow. It didn't catch on. I think, mainly because of some styling and marketing mistakes. Examples include the Dreadful name (Tempter) clunky oversize tail light, smallish overly sculpted tank, fat instrument pod, and massive two-tier seat. Testers grumbled about these and lamented that it was, otherwise, mechanically, a great bike. Some customized examples look quite nice IMHO. Performance? I tell ya, I researched this for a while and found very little. Lack of aftermarket support is a problem. I've read a comment from a foreign blogger (these bikes did better in Europe) who said the crankshaft did not lend itself to racing. If I ever tackle this bike as a project I would go mild and shoot for an honest 50 to 60 HP. I think that wouldn't be too hard. Deck the barrels for a modest raise in compression, Jet-kit (they're still around) replace the double walled exhaust. You would have to improvise a set and add a less restrictive muffler(s), "cheater" grind the cams--Mega cycle, possibly, because the cams are identical in size to cams used in the GS 500 twins, which they grind. Some have also suggested boring the cylinders to accept larger pistons. So, you would wind up with something that you could make to look like a current retro british twin, like a Royal Enfield, but 80 pounds lighter and with more HP. I suspect a stock Tempter would outrun many of these retros.
