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cmawest
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« on: June 17, 2014, 06:36:31 AM » |
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I'm having a problem I can't pin down. my #1 spark plug keeps coming up black while the other 5 are normal, clean, and nice white insulator. obviously its running too rich. I have checked the wire and with a substitute plug it is getting as much spark as all the rest of the plugs. the carbs were gone through last year with all new oem jets. it actually runs o.k. and sounds very good going down the highway, but I stop and pull the plug and its black again. any ideas ?
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Patrick
Member
Posts: 15433
VRCC 4474
Largo Florida
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« Reply #1 on: June 17, 2014, 09:56:30 AM » |
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Any problem with the air box or intake tube/runner ?
Also wondering about the carburetor diaphragm or spring.
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BonS
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« Reply #2 on: June 17, 2014, 10:19:38 AM » |
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Seconding what Patrick said, I've seen an intake air tube leak cause a black, fouled, rich plug. It's counterintuitave.
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John Schmidt
Member
Posts: 15232
a/k/a Stuffy. '99 I/S Valk Roadsmith Trike
De Pere, WI (Green Bay)
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« Reply #3 on: June 17, 2014, 01:12:50 PM » |
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I have a problem with the other five. You said they're all "normal, clean, and nice white insulator." That would seem to indicate those are running too lean if the insulator is "nice white" when they should be kind of a dusty tan looking. Sounds like you may have more than one problem; too lean on the "normal" five and too rich on the one. Might want to open up the mixture a bit so it runs a bit richer, then start looking for the problem with the one currently running rich. I'd start with the suggestions already given.
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sandy
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« Reply #4 on: June 17, 2014, 01:46:13 PM » |
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Patrick may be on to the issue. If you have an air intake leak, it could be so lean that it won't fire causing a buildup of hydrocarbon on the plug. When I took a carb theory class, this was called a lean miss fire condition. It looks like it's too rich but is actually too lean to fire.
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cmawest
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« Reply #6 on: June 17, 2014, 04:35:37 PM » |
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figured it out, I appreciate your effort but all were wrong. the air passage into the carb was blocked, took off the chrome cap and sprayed carb cleaner down the hole and viola' runs smooth and all plugs the same color.
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Patrick
Member
Posts: 15433
VRCC 4474
Largo Florida
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« Reply #7 on: June 17, 2014, 04:57:34 PM » |
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Glad its fixed. But, what hole are you talking about ? Wouldn't that hole have something to do with the diaphragm or slide since the 'chrome cap' had to be removed ?
Since as you put it we were all wrong, I guess we'll not have to help with anything again.
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Patrick
Member
Posts: 15433
VRCC 4474
Largo Florida
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« Reply #10 on: June 18, 2014, 03:21:50 AM » |
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Thats not what I said and why don't you answer the question.
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