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hi, sounds like a stuck float in your carb. Try tapping the carb briskly! sounds like gas is slowly dripping in the bowl overnight and you burn it the next day. I would take the bowl off and see how much gas pours out. It should come out like a light stream of pee. Could be cloged fuel filter or a gumed up or broken float, carb rebuild kits are cheap. Good Luck!
If your engine has not been serviced since 1994 you have certainly gotten a lot of goody out of it. The popping tends to indicate a need to have the valves re-seated. The carb should be cleaned, oil changed, and a new spark plug installed. You can do the carb, oil and plug yourself. Your bigger problem is finding a shop willing to work on it. Most dealers will not work on a machine more than 10 years old due to parts avaiability. Call around. Often shop mechanics repair stuff at home to make extra cash. Ask the cost for reseating the valves. You can see a diagram of your engine at the site below. > please rate my answer.
www.babbittsonline.com/pages/parts/viewbybrand/default.aspx
Yamaha ignition coils never go bad. It is probably the Stator/ Pulser coil (very common). You can check them with a ohm meter. You'll need the readings from a Yamaha dealership. The CDI box is very seldom bad But there is no checks that can be done on it. If everything else is fine ---than Yamaha says it must be the CDI box.(Rare)
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