My Suzuki DT 200 has the oil reservoir tank under the motor cover. Stamped into the tank is the word "lean" with an arrow. I guess this is telling me theres an adjustment to change the oil-to-gas ratio, but I cant find out how or where. the reservoir has a molded hole all the way thru where "lean" is but nothing on the other side.<br />can anyone walk me thru how to to make the adjustment, and more importantly tell me when/why I should make it?