My fuel tank on the KTM hasn't expanded but the fuel cap did. I had to grind the bottom plastic flange down to make it easy to get off. Not one sign of the tank expanding even with our crappy ethanol fuel here.On all the KTM forums everyone bitches because their tanks don't expand. I've even read of people putting pure ethanol in their tanks and pressurizing them with air to try and expand them. KTMs make so much power we need more fuel capacity.
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