Many Venoxes have a vaporlock problem caused by the lack of venting in the gas cap. This problem is easily remedied by replacing the check valve with a long piece of tubing. Simply loosen the instrument cap from the tank. The check valve is right there. after taking it out, run the new tubing along the frame and down by the swing arm for any overflow discharges. You´re done! put the 3 screws back in the instrument cap and ride safely!