man i tried everything to get my '77 to start and it only starts with carb spray "am Gona try the rocks in the tank think:)" i'd cleaned the carb lots of times and still does not starts unless its with that carb spray..but even with gas it turns off as soon as i stop spraying carb. also the petcock leaks. where can i get a new one. the three Honda dealers around here cant get the part. what to do??