Ok so I have an e50 maxi with a dellorto 21mm, malossi filter, 70cc treats w/ hi head, boss pipe. I had her runnin nice until my fuel bowl cracked and caused a major air/ gas leak. I fixed that, but it's still boggin real bad, even back firing on me. (when on the kickstand) if i go from not touching the throttle and then suddenly give it WOT it wont rev up at all, but if i SLOWLY open the throttle it'll scream to high rpms like it should. I have an 82 jet in it right now but it's about 45 degrees Fahrenheit where i am so maybe mother nature is fuckin me up??