My 2003 450R starts great as long as the temps are above 50F. Hot or cold. As soon as it drops below 40F I cannot start it if my life depended on it. The valves are properly adjusted including the cold start valve. I've had the bike for 3 years, and have no idea what the pilot jet size or needle position is. I want to start riding when it gets cold, but can't! Any suggestions???