The carburetor for Yamaha Gladiator can be availed from its authorized service center. The bike being quiet old may not get a Gladiator carburetor but Yamaha technicians can get you a suitable and much improved version for your motorcycle. You can also get the same from some aftermarket shop but the reliability factor decreases in that case. Yamaha service center would give you a genuine part, even if it belong to some other motorcycle of the same category whereas the aftermarket shop can give you some low quality part for a wrong price due to its scarcity. The 5-speed Gladiator was a very impressive bike of its time and you can even get it more alive with the help of better and genuine parts for the bike.