82-1100 Interstate Missing? - Steve Saunders Goldwing Forums

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post #1 of 39 (permalink) Old 04-09-2019, 08:37 PM Thread Starter
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82-1100 Interstate Missing?

Just started up the 82-1100 after its long winter's nap and went for a 40 mile ride. At idle, when warm, there is an occasional loud knock that sounds like a cylinder is missing. Could be an almost-plugged slow speed jet, I suppose, so I'll put Seafoam in the tank when I gas it up tomorrow.

Question: When I got back, just for grins, I checked the plugs. When I removed the #1 or #2 plug, the engine stumbled but continued running (rough). However, when I remove either the #3 or #4 plug, the engine quits. Could this be an indication that I have weak coil or cable?

Also: The left side plugs were Autolite 4163 plugs and the right side were NGK DPR8EA-9. I'll replace them all with new DPR8's tomorrow, but could that have caused the knocking?

Thanks.

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post #2 of 39 (permalink) Old 04-09-2019, 09:32 PM
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Sounds like a misfire on #1 or #2. Check plug caps

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post #3 of 39 (permalink) Old 04-09-2019, 10:19 PM
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Quote:
Originally Posted by PAPete View Post
row.

Question: When I got back, just for grins, I checked the plugs. When I removed the #1 or #2 plug, the engine stumbled but continued running (rough). However, when I remove either the #3 or #4 plug, the engine quits. Could this be an indication that I have weak coil or cable?

.
You already have a dead cylinder on 1 or 2 so when you pull a wire off 3 or 4 you have 2 dead cylinders, it just can't idle on 2 cylinders.

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post #4 of 39 (permalink) Old 04-10-2019, 07:17 AM Thread Starter
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Originally Posted by DaveO430 View Post
You already have a dead cylinder on 1 or 2 so when you pull a wire off 3 or 4 you have 2 dead cylinders, it just can't idle on 2 cylinders.
Thanks, Dave. But since it happens to both, do you think it might be the coil?

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post #5 of 39 (permalink) Old 04-10-2019, 07:23 AM Thread Starter
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Originally Posted by Sprocketrocket55 View Post
Sounds like a misfire on #1 or #2. Check plug caps
Thanks, Sprocket. Not sure how to check the caps, but if it's in the manual, I'll find it.

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post #6 of 39 (permalink) Old 04-10-2019, 07:26 AM
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Secondary winding on these coils is isolated, so the coil secondary winding depends on BOTH sparkplugs to complete the circuit. If either is compromised, neither will fire. So if you pull the wire off either #1 or #2, both will go dead.

But if you ground the wire you pulled off a sparkplug, this will allow the other plug to resume sparking.
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post #7 of 39 (permalink) Old 04-10-2019, 08:58 AM
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Check continuity with an ohm meter. Should be a high value my gl1200 is 5k ohms

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post #8 of 39 (permalink) Old 04-10-2019, 01:32 PM Thread Starter
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Check continuity with an ohm meter. Should be a high value my gl1200 is 5k ohms
Thank you, Sprocket. I'll check that out after re-testing the spark, per DenverWinger's post (above).

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post #9 of 39 (permalink) Old 04-10-2019, 01:38 PM Thread Starter
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[QUOTE=DenverWinger;5834747 So if you pull the wire off either #1 or #2, both will go dead. But if you ground the wire you pulled off a spark plug, this will allow the other plug to resume sparking.[/QUOTE]

Thanks, Denver. I'll try that. Now if I can just figure out how to get the double cap cover off those two plugs.....

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post #10 of 39 (permalink) Old 04-10-2019, 01:43 PM
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Might have to warm the rubbers up with a blow dryer to soften them. Then the Caps unscrew from The Wire. Turn the cap while holding the wire counterclockwise to unscrew it, it threads into the wire core

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