How big is the tank on the 250 thumper?
I saw somewhere it was 6.3L.
Remember the recent thread from gasgasman where reiju is selling this bike rebadged under their brand name :
http://www.gasgasrider.org/forum/showthread.php?t=5048
Tank capacity is listed at 9.5 liters;
That makes it 2.5 gallons - nice size for a small bore 4 stroke...
jeff