Misfire when wet - Wrist Twisters
 
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post #1 of 9 Old 03-10-2015, 11:12 AM Thread Starter
Tirone
 
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Misfire when wet

Recently I've had an issue with the 04 919 with a misfire on cylinder 1 when riding in the rain or even on wet roads. I've pulled that plug and it looks just fine. However, in my completely scientific testing, I've noticed when I let the bike idle in the garage and throw water on top of the engine, one of the wires (I'm assuming to cylinder 1) was arcing visibly in the middle under the frame. Trying to reproduce it later didn't visibly show the spark, but it still produced the misfire and made the clicking sound indicating a voltage leak. Moving the wires didn't seem to effect the issue.

As far as I can tell, water isn't getting into the actual plug holes at all and the boots look ok. Has anyone else had this issue? I didn't think it would be a problem on a bike with only 7400 miles and an untouched ignition system.

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post #2 of 9 Old 03-10-2015, 11:26 AM
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Quote:
Originally Posted by zgrounds View Post
Recently I've had an issue with the 04 919 with a misfire on cylinder 1 when riding in the rain or even on wet roads. I've pulled that plug and it looks just fine. However, in my completely scientific testing, I've noticed when I let the bike idle in the garage and throw water on top of the engine, one of the wires (I'm assuming to cylinder 1) was arcing visibly in the middle under the frame. Trying to reproduce it later didn't visibly show the spark, but it still produced the misfire and made the clicking sound indicating a voltage leak. Moving the wires didn't seem to effect the issue.

As far as I can tell, water isn't getting into the actual plug holes at all and the boots look ok. Has anyone else had this issue? I didn't think it would be a problem on a bike with only 7400 miles and an untouched ignition system.
unscientific or not, anytime you can see visible arcing there's something seriously wrong going on... First I'd check and make sure all your ground wires are tight, and then replace the plug wires... Small cuts in the insulation can be hard to spot but cause big problems...

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post #3 of 9 Old 03-10-2015, 12:20 PM
Discen
 
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The wire could arc in a place and not in the other.

Replace the plug wire, they do go bad.

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post #4 of 9 Old 03-10-2015, 01:59 PM Thread Starter
Tirone
 
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Well I think I found the problem... Insulation is ripped through all the way to the wire. Anyone know how to get the wire out of the boot? They are sold as two pieces.[IMG][/IMG]

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post #5 of 9 Old 03-10-2015, 02:03 PM
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post #6 of 9 Old 03-10-2015, 02:55 PM Thread Starter
Tirone
 
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Fixed with a gratuitous amount of electrical tape for now. Seems to have fixed the problem at least until the new wires ship. Thanks guys.

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post #7 of 9 Old 03-10-2015, 07:43 PM
Discen
 
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The wire is just screwed on the boot.

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post #8 of 9 Old 05-16-2015, 09:18 PM
Milites Gregarius
 
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Should the boots be replaced too? Can the boots leak? At least one wire on my bike is leaking and it is black in those spots, but no sign of breaks. Can the isulation just get old and not resist as much?

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post #9 of 9 Old 05-16-2015, 11:43 PM
Why's everything on fire?
 
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Yes and yes.

Just FYI, the wires and boots are sold separately.

Boots:
30700-MCZ-000, MSRP $21.04, need four.

Wires:
WIRE, IGNITION (1) 30733-MCE-505 $13.65 (Old number 30731-MCZ-003)
WIRE, IGNITION (2) 30732-MCZ-003 $12.93
WIRE, IGNITION (3) 30733-MCZ-003 $13.51
WIRE, IGNITION (4) 30734-MCZ-505 $9.00 (Old number 30734-MCZ-003)

1986 Honda Nighthawk 700S
2002 Honda 919
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