I need all DRZ riders help, and anyone else who may have some helpfull advise!! OK, so I bought an 07 DRZ400SM about 2 months ago with a good amount of mods already done. Thats the good, heres the not so good. Any time I get around 75 mph I get a shake in the front end. The tires were almost worn out (michelin pilot rear, dunlop front) so I replaced them with some Avon Distanzias and yet it STILL does this. What the hell is the deal here fellas??