Mercury - Carburetor Repair Kit FourStroke Series Precision Fuel System Components 8M0044577. Overview. There's a certain peace you feel when your small outboard fires on the first pull and settles into that steady, familiar hum. It sets the tone for the whole day. But when a carburetor starts drifting out of tune-maybe the idle wanders, maybe it bogs when you throttle up-you feel it instantly. That's when a proper rebuild makes all the difference. The Mercury Marine part number 8M0044577 Carbur