Hmm, sounds like your switching fules has caused some trouble. What were the fueles you changed from and to? What is your starting drill as far as choke and kicks? Many times I have stored my bike for a month or more and have found small mamals (rodents in specific) have claimed the air box as their abode and caused many starting a nightmare
. I recomend checking the air box, draining and refilling the fuel with 93 octane or better, and purging the carb bowl. (loosen and drain the bowl / main jet access bolt) and refill with known good fuel. I actually had a bud whose girl friend sabatoged his dirt bike fuel with water! Took us 2 hours at the riding spot to drain and refill the fuel tank
durring the trouble shooting proccess
. We both said it ran fine last time and started right up before puttering out never to sputter agian untill a full fuel purge! Oh, and for an extra 2/100 of a dollar, I would not wipe my butt with most owner manuals, but the factory WR manual is worth its weight in Chilton manual covers with pretty color picts! Its a good book and probably the first manual I have read cover to cover! GET ONE! Read the oil checking drill and carb tunning section for some enlightment.