My son was playing around on his DRZ 110 and hit the vent tube on his gas cap. rather than the tube falling off it broke off the nipple at the base of the cap. We had plans to go ride on sunday and i can't get a replacement cap in time. what would happen if he rode with cap as it is with no vent tube and just a small hole where the nipple would normally be? Im sure i can't plug the hole and I'm afraid to leave it open. any suggestions?