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Try this ... run a hotter plug one or two ranges higher than called for by the manufacturer. Best place to get advice on this is from the friendly guy or gal at your Yamaha Parts counter. You are using the proper mix, correct?????
Nothing wrong with a bit of overfueling, the flames are a bit of a worry though. If the ignition timing is too far retarded, the mixture will still be burning when it leaves the chamber. Also if the spark plug is gummed up, that may cause a problem of miss firing causing flames in the exhaust pipe.
Take out your spark plug, but plug it into the plug-wire. Let the bottom of it dangle against the head and try to kick it. If no spark, problem with that, if it sparks, you may have a cracked head or piston/rings problems. This will at least rule one thing out.
The spark plug is in the center of the cylinder head you will have to remove the gas tank to get to it. When you change the plug put a little gas down the hole that should help it start after sitting for so long.
(1) You will need to adjust the float pin to get the correct amount of fuel in the float chamber of the carburator.
(2) You will also need to set the air-mixture screw , but before you do tht remove the spark plug and see whats the condition of it, is it black , is it brownish, or is it whitish.
If its blackish = means rich too much of fuel, if its browinsh= ok, if its whitish = its too lean.
(3) As for hesitation, check the needle at carbs piston on the accelerator cable, and blow the main jet with high pressure.
(4) Check too the spark plug gap and if its as per the manufacturers specs.
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