i have been racing the 520sx, and i really love the light feel of the bike compared to my yzf. my question is...how do you tell how much fuel is in the tank? i hate to fill the thing up just to do a 10 min. moto. ive tried flashlight to see down in there, but that didnt work. i tried some of those floating balls by mx bonez, but i couldnt stand all the noise they make in the gas tank. it sounds like a big plastic drink cup full of ice being shaken. believe it or not, you can hear it while your in the air in a race. i evan went so far as to drain the fuel out and reload a half gallon after every moto, but thats a pain and i alway end up knocking some dirt off into my gas can. its a light bike (for an open class four stroke) and i want to keep it that way when i race. any ideas?