99 mercury 150
by jim williams
(loxahatchee, florida, usa)
oil mixed at 50 to 1 ratio - carbonated - runs fine at wide open throttle but misses at mid to lower rpm's - rebuilt powerhead about 2 years ago - compression is even in all cylinders - plugs don't appear to be fouled - however what i feel is excessive smoke at startup - like a california fog bank, but after runs for minute of two smoking goes away
curious as to what could be causing the intermittent missing at low to mid rpm range - Not really performance issue, just little annoying and disconcerting - more like a hiccup or bump than a mis-fire.
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