Mine has been great with no real issues since I purchased it new in 1980 . I had it set up for ice racing with studded tires and had a blast with it since new . I don’t ride it much lately. But it is very user friendly and faster than my Cousins YZ 490 ... YZ is quicker off the line but when I get to top two gears I catch and walk away from the 490 .. Edit : the only issue I remember with mine was it had a habit of blowing out the bottom base gasket of the 465 jug .. so I just sealed it with permatex instead of the gasket which fixed the problem and increased the compression ratio due to being thinner and made it faster ...