you can just guesstimate rpm its usually like 1/8 throttle its not extremely important to be right on 3000....sounds to me like you got water in the two connectors that are attached to the left side handle bar switch housing (kinda common for corrosion)...remove them and blow them out and if you find green in there make sure the terminals and pins are clean..this could also be part of your problem........if battery is shorted or has absolutely no voltage in almost positive these wont run...ik the older ones that have a half phase charging system wont...one way to check would be if you get it running wit hthe battery disconnect it and see if you have spark