Back in May the bike ran fine. It sat since then and now is misfiring and lacks Power. Pulled the plugs and found the left side all carbon'ed up and wet while the two right ones were fine. Put new plugs in it but it didn't fix it. Ran a heavy dose of sea foam through the tank and put around 100 miles but that didn't fix it. Filled the carbs up with seafoam and let it soak overnight, didn't help. Ran seafoam through each vacuum line, and then pulled the new plugs and they had the same as the old plugs, the left ones black and fouled, the right ones look like new.
OK compression test and all cylinders good. Vacuum on all 4 carbs are equal. Today removed the plenums and sprayed a whole can of carb cleaner through the carbs. Still not fixed.
I have a set of used coils to substitute out but the front left coil is near impossible to get to. I am now also suspecting the ignition module so I bought one off fleabay but it won't be here until next Friday. Tomorrow I am pulling the carbs to inspect and clean them and set the floats using the "Goose" method. I really don't think it is a carb problem as I have a hard time believing both on one side would go out at the same exact time. I am getting spark but who knows if it is happening at the right time on #1 and #2. Tomorrow I am also going to check the TPS for range of motion, the resistor element is in speck, I just don't have someone to twist the throttle while I hold the meter on the pins. I will also check the pickup coil but I doubt it is bad, the bike runs and #3 and #4 seem to fire fine.
So I am really racking my brains trying to figure out what would cause 2 plugs to foul out simultaneously without the other two being affected...