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Need advice on clean spark plug
#13448877
02/23/20 10:55 PM
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Joined: Mar 2007
Posts: 69
Wink68
OP
Outdoorsman
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OP
Outdoorsman
Joined: Mar 2007
Posts: 69 |
Hey fellas I have a 97 Mariner 150. I mix the oil. From time to time I will take the plugs out and clean them up. (Makes me feel better) Anyhow, I have one plug that always looks new while the other five have carbon deposits(?) on the electrode. Does this mean it's not firing? If so, is there any way to test the plug wire.(Preferably without getting shocked) I know it's not that plug because I have switched them around for that reason. Thanks
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Re: Need advice on clean spark plug
[Re: Wink68]
#13448898
02/23/20 11:12 PM
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Joined: Sep 2010
Posts: 1,599
boatwhisperer
Extreme Angler
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Extreme Angler
Joined: Sep 2010
Posts: 1,599 |
take the plug out and reinstall it in the boot take a jumper cable and attach one end to a good ground and the other end clamp it on the threaded end on the plug crank it over and see if the spark is jumping the gap. no fire time to troubleshoot
Last edited by boatwhisperer; 02/23/20 11:17 PM.
boatwhisperer
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Re: Need advice on clean spark plug
[Re: Wink68]
#13449422
02/24/20 01:57 PM
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Joined: Dec 2002
Posts: 3,826
Tommy Yetts
TFF Team Angler
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TFF Team Angler
Joined: Dec 2002
Posts: 3,826 |
If you haven't lost power then it is working. It could be that that cyl. may be firing hotter than the rest. I would put it in a different cyl. than the one it came out of and run it a while. Recheck and see if it comes out different.
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Re: Need advice on clean spark plug
[Re: Wink68]
#13449464
02/24/20 02:19 PM
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Joined: Jul 2010
Posts: 1,336
boatman025
Extreme Angler
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Extreme Angler
Joined: Jul 2010
Posts: 1,336 |
As cheap as plugs are I would replace them al l
Hughes Marine 3855 Osage Lane Wylie ,Texas
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Re: Need advice on clean spark plug
[Re: Wink68]
#13449474
02/24/20 02:28 PM
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Joined: Feb 2006
Posts: 3,738
bronco71
TFF Team Angler
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TFF Team Angler
Joined: Feb 2006
Posts: 3,738 |
Since you have ruled out the plug by switching them it could be a bad coil, I had to replace one on my old Black Max that wasn't firing and another that was firing intermittently...also check your plug wires.
1987 Nitro MX185/Mercury Black Max 150 1999 Triton TX21/225 Mercury Optimax
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Re: Need advice on clean spark plug
[Re: Wink68]
#13449973
02/24/20 06:16 PM
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Joined: Jul 2010
Posts: 1,336
boatman025
Extreme Angler
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Extreme Angler
Joined: Jul 2010
Posts: 1,336 |
could be coil or switch boxes
Hughes Marine 3855 Osage Lane Wylie ,Texas
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Re: Need advice on clean spark plug
[Re: boatman025]
#13453552
02/27/20 06:17 PM
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Joined: Apr 2004
Posts: 13,991
Stump jumper
TFF Guru
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TFF Guru
Joined: Apr 2004
Posts: 13,991 |
could be coil or switch boxes +1, if you want to test the fire from the coil take the wire off the plug and put a screwdriver in the cap making metal to metal contact and holding the plastic handle move the metal shaft of screwdriver towards the block while someone cranks the motor. A strong spark will jump a pretty good gap. One concern is if that plug is that clean it may not be getting fuel. If a 2 cycle is not getting fuel to a cylinder then that cylinder is also not getting something else. You might take a pic of that plug and post it. Not after you cleaned it though.
2200 Bay Champ/200 Mercury Optimax 2017 Tundra TSS 4x4 Crewmax 5.7L
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