Plugs carb boot had fell off new gas running to flush out possable obstructions
Burned intake valve, out of time, excessive carbon on the valves.... check timing first then go inside the engine for burned valves.
SOURCE: 2001 yamaha Grizzy 600 not getting gas
Hi Daniel,
Check the ignition coils.
Knight. (yamaha seca XJ750A 1981)
SOURCE: Carb leakes gas out overflow
It doesn't take much to hang the float valve open. The smallest speck of dirt or debris will cause the float valve to not shut the flow of gasoline off. After sitting for that length of time, the carburetor needs to be completely disassembled and cleaned. Use an automotive carburetor cleaner (but do not put any plastic or rubber parts in the carb cleaning solution as they will be eaten up). While you've got the carb apart, inspect the float valve. Replace it if there's a groove worn into the tapered seat. Installing an in-line fuel filter may help, too.
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