Hello.. So let me begin by telling you what I have done with the wheeler.. its a 2002 polaris sportsman 500 AWD.. I am doing repairs on it for a gentleman.. when I got it the pick up was bad and it was out of time.. I bought a whole new stater/pick up unit for it and put it in.. ohm’d everything out and it has passed.. reset timing by the book to where it is supposed to be.. put everything back together and made sure it had power.. now it has good spark.. good compression.. and seems to be getting fuel.. but when I turn it over I get nothing.. not a backfire.. not any type of sign showing it wants to start.. I removed the carb.. checked the valves for movement.. checked the lash.. everything seems to be on.. I spray starter fluid in the carb intake with the carb off and it flames up in the intake.. almost as if the firing is to soon.. but it doesnt act like it is backfiring out carb.. it just flames up.. I rechecked the timing and its on.. any ideas what this might be???