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Hello, my name us Charles. I will assist you.
Do you have the serial number of the engine handy?
Ouch. Can you remove the cylinder head and see how bad it is?
That is still rough.. When you do either rebuild them or have them done, Make sure to look at the exhaust tuner inside the drivesshaft housing. It can come loose and partially block the exhaust, and may have lead up to this problem now.