'92 75 hp Mariner - cutting out in mid range only, fouling plugs WOT.

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sdreece

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Joined
Jul 20, 2004
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I've had this motor for a few hundred hours or so and I have not changed the way I run it.<br />I noticed a sluggish / cutting in/out (like a miss) when accellerating or trying to hold at less than WOT (between 1500 and 3500 RPMs). It starts, idles and runs wide open like a charm.<br />I took out the plugs and found them to be verry carbon/oily, so I replaced with new plugs, used fresh gas with 2+4 stabilizer, but then after about 2hours of WOT (or close - no idleing) I removed the new plugs and same thing (black and sticky). The thermostate seems to be working and I tried a completely separate fuel system (remote tank) and same problem.. any suggestions??
 
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99tango

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Jul 18, 2004
Messages
9
Re: '92 75 hp Mariner - cutting out in mid range only, fouling plugs WOT.

Could be time to rebuild the carburetors. It sounds like they are dumping too much fuel into the engine.
 
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fun123fun321

Cadet
Joined
Apr 16, 2004
Messages
9
Re: '92 75 hp Mariner - cutting out in mid range only, fouling plugs WOT.

Hi 99tango: <br />Do you think rebuilding the carb will fix my problem too? I have a 1993 Mariner 50hp. The motor would run at full throttle for awhile. sometimes 5mins, sometimes 30mins. then bogs down. When that happens. I would put it to idle and slowly throttle it. The motor would slowly move up to 1500 - 2000rpm, then start to bogg down again, but ocassionally it would recover and runs fine for awhile then boggs again. I removed the plugs and found them kinda wet with blackish on the tip. I replace them with new ones. Then it would run fine for a bit(1mins+). I've rebuilt the fuel pump, new gas tank and cable gas/oil mix ratio 1:50(quick silver prem). Could it be the carb,stator,plug wires? I have the manual, but no help. Your help is greatly appreciated.<br />Thanks in advance.
 
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sdreece

Recruit
Joined
Jul 20, 2004
Messages
2
Re: '92 75 hp Mariner - cutting out in mid range only, fouling plugs WOT.

Originally posted by 99tango:<br /> Could be time to rebuild the carburetors. It sounds like they are dumping too much fuel into the engine.
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