Probably have contaminates in the float valve area. Fuel doesn't shut off when the bowl is full. Some should into the cylinder and washes down the side into the oil.
1. Disassemble and thoroughly cleans all the jets, passages including under the pilot mix screw
2. Remove an replace the float needle and seat
3. Be sure the goats have no fuel in them (cracked)
4. Change the oil
5. Balance carbs
6. Enjoy the ride.
BTW, the wiki KB has all this in it
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