The Husqvarna SM570R's liquid-cooled SOHC single cylinder motor feels slightly over-geared as stock, but dropping the front sprocket to a 16-tooth brings it alive – snarling and barking. The huge 98mm piston responds immediately to the demands of the 41mm flatside pumper carb with huge shove and a race can or system can easily get the power towards 60bhp, easily accessible through the slick gearbox.
