Crazy fast Kawi 750 triple

This is a bike like a friend of mine had and I helped him build it to the hilt...it was crazy fast...When I took it for a short spin at high rates of speed, the chain would be loose when I got back...if you opened it up at 70 mph the front end would come up into a wheelie...It had these same chambers, but without the silencers...it would blow smoke rings 10 or 15 feet behind the exhaust...It was very difficutlt to crank because it did not start running until about 3000 rpm...I had it for a short time and then sold it because I had a bad feeling about this bike...The guy that bought it didn't last two weeks before being killed on it.