Quote:
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Originally Posted by Shandy
aesthetically check for rust on the frame/swing arm as there made from the good old mild steel
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[pedant mode]
that's Chrome Molybdenum steel I think you'll find young feller
[/pedant mode]
Apart from that, spot on. I find the power and acceleration is fine up to 100mph, tops out at about 125 with open airbox / race cans.
As well as the 20cc extra and fuel injection, the 620 benefits from larger throttle bodies and valves, allowing it to breathe far more easily on the inlet side especially.
A sorted M600 carb puts out 51 - 53bhp at the rear wheel, a sorted 620 will put out mid sixties bhp, so a fairly noticable difference in power once you get up to 90 - 100mph and above.