I have an old 1998 rig/ 200 Vmax, i have this probleme since 2 years. When i run for more than 1/2 hour the tank i used starts deforming (shrinking) and the motor stops. I have to open the gas cap to put some air in the tank to can star back the motor. The onely thing i can see is i lost my O'ring arround the gas cap? I think the tanks breathe by the gas cap but i'm not sure?
Is it the o'ring or should i bought new gas cap? or else??
Thanks for any help