I bought a 2001 WR426 about a month ago, stock except the exhaust baffle was removed. It started first kick for a few weeks, but now takes 10-15 minutes to start. It backfires a bit during this time. I have done the following three things which could be the culprit: 1. Started running premium gas- previous owner used regular 2. Cleaned and oiled air filter 3. Gave it a few good washings- plugged the exhaust during the washing I have now drained the carb and replaced the spark plug- still wont start. I did get it to start last night, and it would not idle. I adjusted the idle, and it retstarted fine several times after that. I will check it on cold start tonight. By the way, the plug was nasty, and there was some H2O in the carb, so thanks for those tips.