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    4.3 Mercruiser overtemp only at low RPM

    I have a 2006 4.3 Mercruiser in a Trophy with a closed system. The raw water comes in thru hull. Last fall I had an overtemp problem running it on the hose. I put it in the water and the problem went away. I figured something was clogging the passages and it was cleared. I ran it on the hose 2...
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    4.3 Mercruiser over heating

    I have 2006 Trophy with a 4.3 Mercruiser. Just got it running good(amazing how much better a motor runs when the timing is not off by 5 degrees). I had the boat running on the hose yesterday to check out how it was running after getting it back from the shop. Ran great, but I noticed once it...
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    Where's the choke?

    I have been having intermittent problems with the boat running good and then bad and then ok. I thought I might have a chock sticking. I took off the flame arrestor and look down the carb and the only butterflies is for the throttle. Where is the choke? It is a 2006 4.3 merc with Turn Key Start.
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    Fuel flow test question on 2006 4.3 Mercruiser

    I spliced in about 3 ft of clear line to see if I had an air leak in the fuel system. Boat has been running rough and cuts out and back fires when advancing the throttles. I had to splice the line in prior to the fuel/water separator as it is a hard line/braided line combo between separator and...
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    Choices...rebuild card or have timing set

    I have a 2006 4.3 Mercruiser with a Mercarb on it. It does not want to hit WOT and backfires through the carb and wants to die when advancing the throttle, unless I do it extrememly slow up to about 2500. It is very responsive after that. I can afford to either rebuild the carb, or take it and...
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    4.3 MerCruiser runs lousy for 2 years

    I have a 2006 4.3 190hp MerCruiser S/N OW379161. I bought it new in Jan 2006 and it only has 130 hours on it. In 2009 I had it out and over a 6 hour trip it would bog down to about 3800 rpm at WOT and then pick back up. It did this 3 times. I replaced the spark plugs and I didn't have a problem...
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    4.3 Merc will not start

    First visit to iboats. Need some help. I have a 2006 Trophy 2052 with a 4.3 Mercruiser. Last year while running about 4400 rpms the motor slowed to 4000 for about 5 seconds, then picked back up. A little while later I would hear the occasional knock. I got home and put it on the hose and it ran...
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