Got me on this one. I cleaned the carbs and actually drained the old fuel and added fresh 93 octane just to be safe. I bought this sled last year with 15 miles on it (guy never used it since new, lucky find) I put 500 on it last season and it ran like a corvette! Anyway the thing starts up and ONLY runs and 3K. Throttle has no effect nor does the choke, it just stays there and not very smooth either. WTF is going on here. I appreciate the advice.