hi new to the site and a new fourtrak owner.got a 2ltr petrol 89 rocky and on the whole its great.except i seam to be getting about 10 mpg.air and oil filter are new as is oil and it runs well.any ideas why it would be overfuling?starts ok but you do have to put your foot flat to the floor sometimes.could it be the auto choke or something simple i can diy.cheers