nuther Spark question


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JDMAG
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Motorcycle: 1980 GL1100I Interstate

nuther Spark question

Postby JDMAG » Thu Sep 05, 2013 11:17 pm



1980 GL 1100 I
I am having a bit of a miss on one cylinder. And if I pull that plug (on #2) the idle doesn't change. The spark on that plug wire doesn't seem as strong as on #4,(by visual inspection) but there is still spark. I am going to check compression tomorrow. I pulled the #2 wire off at the coil and it was full of corrosion I cleaned this but it still seems weak. If I pull this plug wire off while its running, it does not change the idle. if I pull any of the others it kills the engine. do I have a weak coil, or am I looking at bigger issues? I realize I wont know for sure until I check compression. Just askin.
Thanks.



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David-Mantle
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1980 CB400N

Re: nuther Spark question

Postby David-Mantle » Thu Sep 05, 2013 11:44 pm

I would be inclined to change plug wires and caps for the offending cylinders as well as plugs. If that does not improve matters then swap over the spark amplifiers , found under the faux tank , and see if the problem moves over to the other pair.
Just a thought - hope it helps.
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JDMAG
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Re: nuther Spark question

Postby JDMAG » Thu Sep 05, 2013 11:49 pm

New plugs. but I did swap #2 and #4 wires. it still makes no difference when I pull off the wire on #2 cylinder.

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lacanars
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Re: nuther Spark question

Postby lacanars » Fri Sep 06, 2013 6:56 am

Did you swap as in, from the coil to the plug? If you still have the same side of that coil going to the same cyl then I would suspect a bad coil. If you just unplugged at the plugs and swapped one side to the other, then it could be carb or plug related.

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JDMAG
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Re: nuther Spark question

Postby JDMAG » Fri Sep 06, 2013 7:03 am

yes. I swapped from coil to plug.

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lacanars
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1981 Honda CM400C
1978 Yamaha XS400

Re: nuther Spark question

Postby lacanars » Fri Sep 06, 2013 7:20 am

Try just swapping at the wires at the coil and leave the same ends to the plug, they both fire at the same time so no worry about timming. This will tell you if it is the coil.

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JDMAG
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Re: nuther Spark question

Postby JDMAG » Fri Sep 06, 2013 10:07 am

This morning I swapped the wire at the coil. Last night I may have swapped with the wrong coil, and the timing was off. When I swapped plug 1 and 2 and the coil, the back fires moved to the other exhaust. Therefore I apparently have a weak coil pack. I read the Wasted spark article in another post,(constant spark) and it all makes since now. I guess I can still check the compression. Just for learning purposes.
Thanks lacanars for the info! :D

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JDMAG
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Re: nuther Spark question

Postby JDMAG » Fri Sep 06, 2013 1:04 pm

I checked the Compression, about 110 to 115 PSI per cylinder. In the process, one of the "new" plugs, seemed to have NO gap. As I looked at it, the gap came back! It seems the electrode was loose. it was on #1 cylinder. The weak spark, is on #2 cylinder. both are on the same coil. I replaced the failed plug, and it sounds 100% better now. I think I will still replace the coil pack, just to be sure. :geek:

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WingAdmin
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Re: nuther Spark question

Postby WingAdmin » Fri Sep 06, 2013 4:04 pm

Sounds like you've nailed it. The coil packs really very seldom fail - if it's running good now, you shouldn't need to replace it.

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JDMAG
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Re: nuther Spark question

Postby JDMAG » Fri Sep 06, 2013 4:30 pm

WingAdmin wrote:Sounds like you've nailed it. The coil packs really very seldom fail - if it's running good now, you shouldn't need to replace it.

Good!!!




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