Very nice bikes those TT600's.
I miss my XT550. I still regret writing the poor thing off
The SR500 was a cafe racer type bike wasn't it? Buddy of mine had a SR400 that he wanted to build up but he couldn't find a CDI. They were apparently notorious for killing their own CDI units
Not much difference between a SR400 and 500 basically the stroke is different , the SR400 was still being made in Japan up to last year .
We have not seen the SR400s here for many years but the rest of the world have had them .



