84 mercury wont run at top speed

by bill joe
(cuba, mo.)

have a 84 mercury on a 84 skeeter boat runs great for 1 to 2 miles and them starts to slow down and want run above 1500 rpms try to thottle it up it well try to die we took back where we bought it they put new swicht box took back to lake still do same thing put new stator still no change new fuel tank new fuel line and bulb no change please help

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Aug 07, 2010
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by: Anonymous

Check your compression to start should only be 5 pounds different between cylinders. then check timing on each cylinder. Go to each plug and make a mark on the flywheel and number whitch cylinder it is. if timing is off on one or more cylinder this means you have a bad diod. if all good then you must have some dirt in your carbs. Clean with a good marine cleaner like Omc engine tuner NOT reg. carb cleaner, This stuff is junk. Hope this helps

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