I just bought a used 2000 Mercury 8 hp two stroke outboard. The motor looks brand new. It however has a problem. At about 1/4 throttle to 1/2 throttle it will backfire and blow a puff of smoke. It trolls just fine and once you crack it over 1/2 throttle it goes great. Just at the lower rpms. Any suggestions would be appreciated. I replaced the spark plugs to no avail. Thanks Warlo
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