I have just recently purchased a 2001 Sportster 883c, overall I am pleased with the bike th only issue I have is that I am having to hold the choke out to start the bike and hold it out for a few min. to keep it running. A friend and I started to look around to figure out what was the problem. We have narrowed it down to water in the tank. Is it ok to put HEET in your tank to fix the problem? I also want to know if it is possible to put a 5 gallon tank on the 883 as a better upgrade for the fuel economy of the bike???