i have same problem..i carry fuel with me when i go for a big rides ..my cr250 chews the fuel up to 25 litres a day on mine.. think its just what they do..
On a two-stroke. the difference between properly jetted and what most people run around with can be on the order .15 lbs of fuel per horsepower per hour. On a 30 horsepower engine that comes out to about 4.5lbs of fuel per hour or about 3/4 of a gallon. That's a LOT of fuel to waste.