I have read some of the threads on fast factory stock bikes here and have owned a few myself. I have 3 Benelli Volcano's and raced my old well used Benelli 180 Volcano against a 1973 Speedway Super Spyder with the mean Sachs 125 about 2 1/2 years ago. The Spyder was fresh,running well and hardly used and belonged to John Marinelli in Ohio and I know him well. The little well worn Benelli walked right away off the line from the Super Spyder with the bigger wheels,sorry Speedway fans. The Speedway would hit around 55 top end and my Benelli has been clocked on police radar on level ground at 62 mph and almost cost me a 100 dollar fine. I have been beating the Benelli to death the past ten years and it still runs good but is starting to suck in some air at top speed, most likely the seals. I have yet to be beat by a stock machine on this one... I am doing a complete rebuild on the rider Volcano this spring,stock piston and bore as it is now. Will see what happens then. Best wishes.