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Old 08-20-2013, 11:54 AM   #1 (permalink)
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Honda 300 coil testing

I've been building up a big 300 lift 29.5 ol2's body lift bored .30 over wiesco piston kit, 54% gr, head work fo-4 exhuast, strectched big red cam, yea im probably missing some. And a New battery

well to the question the bike is complete i went to crank it and the nuetral light wouldnt come on well i had to ground the wire got that now it turns over good, but as far as i know im not getting fire.

wats the best way to test the coil to find out???

would a test light hooked to the ground on the battery and stuck in the spark plug boot do it!!!
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Old 08-20-2013, 02:43 PM   #2 (permalink)
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come on now i know somebody knows how to test a coil.
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Old 08-20-2013, 03:02 PM   #3 (permalink)
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That would only let all of the analog smoke out of your test light!!

There are tests out there looking for specific values of resistance in ohms between the various coil wires and ground. These indicate whether you have broken wires in the coil or perhaps the enamel insulation on the wire is breaking down. These tests are usually done with the plug cap removed so that any resistance there is NOT part of the circuit under test.

The problem here is that every different part number for coils has different values for resistance which makes stating absolute values for any particular type of coil impossible. I have resistance values for my 70's Honda minibike engine coils but that will not help us here.

I will say this - most coils do not fail internally. Usually, it is a broken wire that can be fixed with a high tension wire splice kit. Or, the plug cap fails open with infinite resistance (due to trapped rusty water) on a continuity test on a multimeter - simply get a new plug cap.

I have also "repaired" coils by removing the plug cap and then nipping a quarter inch of the wire off and then reinstalling the cap. Rusty water can wick its way up the wire and kill the spark.

Rick
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Old 08-20-2013, 04:44 PM   #4 (permalink)
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ok thanks so just pull the red boot off and clip a lil' then try her agin??


i love my 300's just hate dang electrical stuff which usualy never have electrical problems.
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Old 08-20-2013, 09:13 PM   #5 (permalink)
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You can try cutting a little off the high tension wire. Just be careful to not damage the plug boot.

How do you know you are not getting spark?? Are you laying the spark plug against an engine cooling fin and cranking the engine to see if you see a spark at the gap? In a dark garage, you can really get a good look and hope to see a fat blue spark.

Rick
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Old 08-21-2013, 08:09 PM   #6 (permalink)
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Yea I've tried it on a fin and no spark then I pulled the boot off and when I did the plug wire came rite out Is it not connected to the piece inside the boot and wat exactly are y'all talking about cutting I cut te rubber back on the wire there is wat looks wire some wire w a loop. I may be sounding stupid but I've never pulled a plug boot off and dnt know wat to do w cutting the wire. Shoot this thing was a frame less than 2 weeks ago and she's 100% complete just want fire now
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Old 08-21-2013, 09:37 PM   #7 (permalink)
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You might try cutting some of the insulation away from the spark plug wire and try it against the fin again. If the plug cap came off that easy, you may have just found your problem.

Then replace the plug cap with this:

NON RESISTOR SPARK PLUG CAP (B_CAP)

The shop manual for my Foreman 500 has an extensive section on coil and ignition testing, voltages, where and what to test, what equipment to use. I am certain the shop manual for your 300 will be equally helpful but I am running out of ideas from here.


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Old 08-22-2013, 04:18 PM   #8 (permalink)
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Well guys I took a coil and a cdi off a running bike and no fire even took the plug out and layed it to the fin agin and still no fire could this be a wiring harness problem
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Old 08-22-2013, 04:48 PM   #9 (permalink)
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What else have you checked? I'm looking in the book here and it says there's a main fuse that would cause it not to get spark under the seat. It's also telling me about a test to see if you are getting voltage to the ignition control module. It says disconnect the connectors, turn on your ignition switch, and engine stop in the run position. Then connect your positive multimeter lead to the black/white connector pin and the negative to the green/white pin. It should read what battery voltage you have. After that, you have the pulse generator resistance test, reverse switch test (won't allow it to start if faulty), and then the stator resistance test.
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Old 08-22-2013, 04:49 PM   #10 (permalink)
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That was for a TRX300EX. Hope that's the bike you are talking about.
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