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I have read a lot of same issue still struggling. I inherited a 1991 Arima 15 sea hunter with a 70 hp 2 stroke. Engine part number E70TLERC , it idles fine, good RPM but when putting into gear boat will just slug along no power barely moving boat. after troubleshooting have found out top cylinder will not produce a spark. Troubleshooting:tested compression and top =105 middle=100 bottom =105,' rebuilt/cleaned all carbs, moved spark plug , spark plug cable and coil from middle to top cylinder and top still will not spark. I then put #1 connection to power pack to #2 cylinder and it no longer has a spark, cable from #2 not long enough to reach #1 so could not test. The power pack looks to be new(all stickers on outside look clean) but no idea what was done to engine. I am at point of being expensive to get parts so looking for ideas. i would hate to replace the power pack (manual says to) and it blows out again.
I am new to boats and marine engines.
Any ideas?
I am new to boats and marine engines.
Any ideas?