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Ok heres the scoop. I have an 85 Mercruiser 260 with a thunderbolt IV ignition. I have just replace the carb from Guarunteed Carburators(rebuilt). The problem is the old carb surged at idle speeds. The Rpms go from 800 to 600 randomly. I had issues with the old carb idle screws being stripped so...
I have a 1985 Sea Ray 250 new to me. It has a mercruiser 260 FWC. I am going through doing a tune up before I put it in the water. I am running on ear muffs. The engine sounded good at higher rpm but at low rpm the engine would surge. Occationally off and on I would hear what I would call piston...
