Brought my 01 yz426 home a week ago. First rattle out of the bag fouled the plug. Just got a new plug this morning. Installed plug, air filter, changed oil and filter. Fired off on first kick and idled very smooth. Now I know it's nothing new to you guys who have this bike but, Holy Crap, this thing has loads of power ! I've never had a bike that would wheelie in 4th gear.