wait wait wait earlier you said it was definatley a fuel problem... you need to rule that out before you start tearing into sh*t.. always start simple.. first check for 3 things.. fuel, spark, and compression.. spark is easy to check for remove the plug and touch the ground strap of the plug to something thats grounded like.. the cylinder or frame. then have somebody kick it over.. if you see a BLUE spark.. your on the right track.. if you don't have spark check all your electrical connections.. if you've got spark your good there and move onto fuel.. if the plug was wet when you pulled it out.. you've got fuel.. if you didn't kick it over at all before you pulled the plug.. then install the plug and kick it over a few times and pull the plug out.. if it's wet... you've got fuel... then check compression.. you'll need a compression guage.. craftsman makes a nice compression guage kit.. costs about $60.. thats the same one i use.. the proper way to check the compression on a 2 stroke is to hold the throttle wide open and kick until the needle doesn't move anymore. might be 5 kicks.. might be 12.. when you get to the point that 2 or 3 kicks doesn't move the needle anymore.. thats your reading. as far as needing 110PSI to make a 2 stroke run.. thats not entirely true.... at sea level or close to it.. i'd say you need at least 90PSI for it to start.. not run well but start.. now at 5000ft the air is MUCH thinner so static compression readings are lower for sure.. if you've got compression, fuel, and spark. my next step would be check the flywheel key even if they are sheared you can still get a spark.. but not at the right time.. does it backfire or make a popping sound through the carb when you try kicking it? if so this may be your problem.. the ignition timing is off.. i know this seems like alot of sh*t to try before you actually take something apart but it really only takes about 10 mins and it can isolate your problem very easily instead of throwing parts at it til it's fixed..