mariner 200 fouling plugs

blueraven · #1 July 26th, 2003, 08:10 AM

I've got an 86 mariner 200 that appears to be fouling plugs. First, I installed new champion L76V's and the engine would not run well, I removed one side and installed the original NGK plugs and had my 19' chaparral up to 60 mph. So I left the ngk's in. That afternoon I went out to take my kid's tubbing and after only about 5 minutes of cruise around 10 mph, I lost power and the engine began to run rough again. I pulled the kids and tube in and puttered around at full throttle for about 15 mins. and the engine slowly began to come back and I was able to get it to come up to full speed again. Put the kids back in the water and again lost power after about 5-10 mins. Does anyone have any ideas on why the L76v's will not work on one side and why I'm fouling plugs?

The Marine Doctor · #2 July 26th, 2003, 12:26 PM

I would assume that you put BUHW's back in for the NGK plugs as they are the equivalent of the L76v's from Champion?

I would suspect that you have a low voltage problem with your stator or the power pack is not stepping the initial stator charge to the correct voltage, resulting in poor spark.

The L76v's are probebly more sensitive to the poor voltage and will foul easier.

The reason I would suspect the pack or the stator is that they are the only common parts that would attribute to one bank of cyl's.

TMD

blueraven · #3 July 26th, 2003, 03:55 PM

I understand. The reason for putting in the BUHW's back in the one side only is I mistakenly thew out the other three BUHW's, and the side I chose was the side easiest for me to get to, the right side, I guess I was lucky. Would you recomend the replacement of the stator or the power pack or both? Is there a simple way of troubleshooting either part?

Thanks,

Craig

The Marine Doctor · #4 July 26th, 2003, 04:06 PM

If you have access to a DVA tester you can test which component is giving you the problem.

If you do not...it would be cheaper for you to take it to a marine dealership and have them test it for you. Them purchase the part you need and change it yourself.

Up here in Canada...the Powerpack is $380 and the Stator is over $400. So you can see how you might save money getting a "PRO" to do it rather than guessing.

TMD