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Hello, this is Charles. Thank you for requesting me today.
Your compression numbers are fine. The carbs have nothing to do with the actual spark on the engine, just allowing the fuel to enter the chambers.
Has your engine been sitting for some time?
would you please post the serial number of the engine?
the thing that I was wanting to look at is the coils. Are there 2 wires with nuts going to each or a multi wire pin going to them?
Are you sure that there is spark on all 6 cylinders?
Do you know if the motor has been sitting for some time?
what you need to do is to clean the other two carbs. Take them off and tear them apart. Pat attention to the jet sizes and where they come from. After getting them clean, using a good quality carb cleaner, blow every passage out with compressed air. Replace all gaskets and the needle valve. reassemble making sure that the float bowl sits level with the top of the bowl when turned upside down. Reinstall, set mixture screws to 1 1/2 turns from a light seat and give it a test.
Just get the carb gaskets kit. You do not need to replace the jets, just clean them.
you may need to go in or out with the needles. As you throttle the engine up, if it sneezes, it is lean, open the screws, if it bogs, it is fat, turn them in slightly.
If the powerhead is original, there is a freeze plug on the top of it with the serial number stamped unto it.
just the air box.