I have an 89 Blaster and i was riding at Badlands IN, I rode all day and it ran just fine, but i stopped and put a new plug in it for the last two hours of riding. After i put it in, it started right up and idled fine but when i put it in gear and took off, it started sputtring and almost died, i pulled the clutch and then the rpms went right up to normal. I tried multiple times with the same results until i turned it off but it would not start up again. I tried changing the plug but it didnt help.