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still needs to see what the timing is at, and a timing light will show what it is, and if it is advancing when it should

I have never ever heard of multiple starters burning up trying to start a motor. there is something very strange going on. exactly how, when, and where did you measure the 12.3 volts at the starter ?

would not hurt to use a timing light to make sure the idle timing is still in spec and advancing properly

it has been way too many years since I messed with a 15

is the bottom cylinder wet with fuel or water? and is there just one carb or 2?

seems like a timing light would tell you what the timing is doing

well he wrote this also, but have no idea what the meter was set to. AC or DC "I just ran the engine with the two yellow wires coming from the stator disconnected. I get 18v when I touch both wires with the probes."

was that 18VAC?

like Boscoe99 said the yellow wires need to be disconnected from the RR when testing for AC to see if it is putting any AC voltage

was the motor running? maybe disconnect the yellow wires from the RR and try it again to see if you get anything from that coil

when reading the yellow wires did you have the meter set to AC since that is what is suppose to be on the yellow wires?

did you read what Seahorse posted in that other thread you posted a link to?

Find an impact screwdriver that you hit with a hammer, they are good tools to have around

are you going to keep it a mystery on what you did to fix your problems?

check compression, sounds like it is having a problem with the water back pressure when dunked(submerged)

it might help if the OP would post proof of what he is seeing

probably not from walmart

if he is buying it at the Walmart link he posted, I am sure it is a Chinese knock off, not a Yamaha OEM filter

So it sounds like you need to fire the motor up more often to keep fresh clean fuel in the carb bowls. carb bowls are vented to atmosphere and will allow the fuel to slowly evaporate OP is correct running a multi carb motor until it dies is not good, because some cylinders will be running lean...

either put a shut off valve in fuel line, turn it off, and then drain the carb bowls so no fuel sits in there and evaporates leaving residue behind, or fire up the motor often to get fresh into the carbs. if you let it sit for months without firing it up you need to drain the carbs