I have been riding a plated '01 Yamaha WR426 for the last few years and it's a very capable bike, but I'd like something that requires less maintenance and has a six speed gearbox. As part of my low maintenance requirement, I wanted something air-cooled. After researching many bikes, it appears that the DR350 is the largest displacement air-cooled dirt bike that come with a 6-speed tranny and and weighs less than 300 lbs.
So last winter I bought a '98 DR350 kicker.