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There is indeed a different part number that gets used when the restrictor is removed.
3RS024180M
GASKET (MFS20)
$5.63
Probably a bit longer to make up for the missing restrictor. I believe the real issue is that you now have double the power, so need some more pitch.
FRESHWATER FLUSHING PLUG (2HP~30HP 4STR / 4B~40C 2STR)
Description
Attaches hose to motor in order to flush motor with freshwater after use in saltwater and/or brackish water.
Fits 4B ~ 40C 2-stroke models & 2hp ~ 30hp 4-stroke models.
Part #: 336600070M
List Price (MSRP): $8.10
Anything around 150F is fine. When was the last time the wp kit was done? If run in salt and not flushed regularly could have buildum in the head areas.
Not familiar with that model. if air from intake, there is some valve leak... if crankcase, likely rings. Re seafoam; it's just mineral spirits, so your mileage may vary. I prefer real carb dip in gallon cans from the auto parts house.
Rule out (or in) overheating. Use a gun type IR thermometer. Cheap at HF and other places. Engine should not be going over about 150F. Stat has NO effect on the pee tube. I trust you did an OEM WP kit, not some cheapie impeller that may fit incorrectly. What is your actual model (not year?)