If you are purging alky you do NOT want to burn all the alky out of the carbs you want to drain it out, you never want to run your bowls dry on alky, that is a disaster looking for a place to happen... when you are done riding, pull the fuel lines off the carbs and drain all the alky out of the tank. then fill your tank with race gas (mixed with 2 stroke oil duh), start the bike, and putz it around till all the alky is burned out of the bike. You will know when it is burned out, starts to run like ass. Leave the purge fuel in that tank till its time to ride again, pull the lines off the carbs, drain the purge fuel out, refil with alky and you are good to go. Thats all i ever did with the alky bike I had and it worked like a charm. Hope that helps.