spark plug

Bike: 05 DRZ SM (3x3, full yoshi, jetted, iridium plug, bunch more visual mods) So here is an interesting question, could I have messed up anything if I rode without an air fuel screw? So here is the back story behind my question: Out of the blue I started getting terrible gas mileage 37mpg...

My wr426 was running completely fine then as I was riding along it cut out. Haven't been able to fire the engine on any of the 500+ times ive kicked it over. So I bought a new spark plug and tested it to only find there is no spark. It was running perfect then just stopped like it decided it...

Hey guys... looking for a little help troubleshooting the problem. I was out riding my 03 DRZ400S today and ran into some trouble. The bike would run fine when it did run. I could be riding along and it would just shut off. The first time it did it I was in about 4th gear and was able to start...