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Author Topic: Spark Plug question  (Read 825 times)

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jgcalifornia

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Spark Plug question
« on: September 21, 2009, 04:52:04 PM »
hello,..just was wondering, on my CB350F i went to test the spark plugs and noticed, with the engine running, 3 and 4 read great, and 1 and 2 didnt read at all, but the pipes were just as hot as the working ones.  After removing the 2 "not working" plugs, i put new ones in and got the same problem.  I verified the gap settings and not sure what else to check.
(tested with multiple testers..)
any thoughts?

thank you for any help!
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Offline BVCB650

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Re: Spark Plug question
« Reply #1 on: September 21, 2009, 04:56:27 PM »
My thoughts are if the pipes are hot as hell, leave it alone.
« Last Edit: September 21, 2009, 05:48:29 PM by BVCB650 »
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1979 CB650, 25K miles, recently refurbished

jgcalifornia

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Re: Spark Plug question
« Reply #2 on: October 06, 2009, 01:40:39 PM »
what would you suggest if their hot infrequently. 
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Offline Duke McDukiedook

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Re: Spark Plug question
« Reply #3 on: October 06, 2009, 01:51:14 PM »
What I want to know is how do you read your plugs with the engine running?
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jgcalifornia

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Re: Spark Plug question
« Reply #4 on: October 06, 2009, 02:16:59 PM »
spark plug test light tester.  goes over the wire.
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Offline TwoTired

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Re: Spark Plug question
« Reply #5 on: October 06, 2009, 06:00:20 PM »
Try inverting the inductive pickup.
   A positive pulse on lead 1, would be a negative pulse on lead 4.  Lots of cheap equipment is sensitive to thinks like that.
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