I have a 01 426, I have had it for about a year now. When I got it, it would start first kick every time (after I mastered it) and run great. Now I have to kick it about 10-15 times to get it to run I also have to twist the throttle about 5-8 times every time I kick it just to get it to fire. I have put a new plug in it and the carb was cleaned about 5-months ago. I have only ridden it about 2 good times since the carb was gone through, although I do take it to a field near my house about every 2-3 weeks and run it until it gets up to temp. I also keep good gas in it and if it sets with any gas older than 2 weeks or so I will top it of with fresh gas. When I get it to stay running and I take it for a ride it wants to backfire and just isn’t running up to par, it sputters bad unless you are getting on it hard. What should I look into first?