I am now the owner of what is turning out to be the rarest bike on the planet...the 750 twin LTD! How on earth can one possibly work on one of these bikes without a manual? Does anybody have any leads on information other than what is supplied on the stickers under the seat? This bike is running poorly on the left side and we now (after carb cleaning, float adjustment, voltage regulator, etc...) are thinking about checking the valves. Suggestions????