Tuned, twin carb version of the Tiger, the Daytona needed revs to run well which meant it was usually flogged into red, thus causing premature engine wear, especially the top end. Midrange engine stutter’s normal. Post ’70 bikes (T100R) have less reliable 40hp engines in similar chassis but using parts left over from the old 650’s. Not that many nice ones left on the market, some very expensive concours on offer.