I owned one of these beauties back in 1968-69. What a KICK to ride! Very fast for a 125, never had any problems with it, other than it ate spark plugs like crazy! Ok, I used to not use the clutch to shift, and broke the shifter mechanism in the trans a couple of times- my bad! I replaced the high pipe with a low full expansion chamber, no baffles, all get up, full race! Could beat the pants off all the 250´s the guys I rode with owned! Ran it on high octane (100+) and Blenzol oil mix. Personally, loved the smell and all the noise, all my buddies hated to be behind me! LOL! I do miss that little monster.....