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I have a mercury 70 hp ser #4994943. It ran excellent down at the coast and when I moved up north to 3000+ feet elevation it bogs down and does not wind out like it used to. Compression is all equal 120+ psi at each cylinder. The main jet is 0.086 and the pilot jet 0.066. My manual (which...
Living at sea level my 1980 70HP Merc ran excellent. We moved up North and live at approx 3000 ft above sea level. Since then my merc is not reaching full speed like it used to. The engine does not wind out like it used to. Taking the cover off the powerhead used to be like looking at a...
