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Just dropped a 700 Non ves twin with twin pipes in my sled, it is ported, heads are cut, timing is advanced. Its a 2001 motor judging by the carbs. My problem is that when the sled warms slightly it wont even crack engagement just dies, I hit the choke it gets worse, I am thinking it is rich, or there is some sensor out of wack. I am used to running a 440 racer so this motor is all new to me. I cleaned the carbs the main jet and pilot looked clean. Wasnt sure how to get to the needle, tackling that tonight. When its cold you can idle it around the more throttle the worse, after it warms up some it gets bad you can spin the track for a second the motor dies down. Stock jetting is 500,520, I have 490's, SLP says I should be 6 sizes higher than stock based on K&N's and porting. I am running race fuel. This setup worked when the motor was used years ago.