Help! my Beta T34 seems to be a cross between the (260cc)89/90 models as seen on the photos on this site.I need advice on carb tuning, it runs but pops a bit when you shut the throttle down hills, also hesitates slightly to drop revs after using a good handfull of throttle.It hasnĀ“t got the proper air filter on (Only some sponge)could it be this? its running better on semi synthetic 2 stroke oil.Also gas cartridge for rear suspension seems empty, can compressed air be used in it. Regards Smith.