My 70hp johnson runs ok but misses. This can be seen when it is just idling and using a timing light you can see the mark on the fly wheel jump. After it misses you can see the extra smoke from the exhaust. I changed the power pack but it did not fix the problem? I have put kits through the carbys as well. The upper exhaust vent holes are also oily and not dry like my other motor. Any ideas?
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70hp Johnson missing at idle
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