I have a 1998 gl1500se trike that I bought in south carolina last may I rode it back to wyoming witch is at 6300 ft. elevation, I really haven't had any major issues with it until recently. When I ride it for a while and it's good and warm, shut it off for a bit and restart it , it acts like it is flooded, I have to hold the throttle open and crank it until it starts. I have also noticed on really hot days the fuel in gas tank boils and the gas cap doesn;t seem like it is venting properly. any sugestions would be helpful.