mariner 200 fouling plugs

[blueraven]

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]

Re: mariner 200 fouling plugs

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?<br /><br />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.<br /><br />The L76v's are probebly more sensitive to the poor voltage and will foul easier.<br /><br />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.<br /><br />TMD

 

[blueraven]

Re: mariner 200 fouling plugs

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?<br /><br />Thanks,<br />Craig

 

[The Marine Doctor]

Re: mariner 200 fouling plugs

If you have access to a DVA tester you can test which component is giving you the problem. <br /><br />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.<br /><br />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.<br /><br />TMD