plugwirs on wrong cyl. (front vs rear cylendrs)
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Road Warrior
Joined: Sep 2006
Posts: 1,570
Likes: 45
plugwirs on wrong cyl. (front vs rear cylendrs)
whoe just found the my sparkplug wires were put on backwards at the coil end!(front vs rear cyl.) po or dealer must have put them on the wrong posts at the coil if you will.
anyway i swapped them back according to my service manual and found the bike ran smoother with better throttle resp!!
i would of thought the bike would of run like sheet with the plugwires on opposite cyl.
anyway i swapped them back according to my service manual and found the bike ran smoother with better throttle resp!!
i would of thought the bike would of run like sheet with the plugwires on opposite cyl.
Seasoned HDF Member
Joined: Nov 2009
Posts: 15,705
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From: Farmington ,MS
With the stock ignition, it doesn't matter...both plugs fire every time.
http://en.wikipedia.org/wiki/Wasted_spark
Last edited by Tom84FXST; May 19, 2011 at 06:20 AM.
Ultimate HDF Member
Joined: Jun 2007
Posts: 9,193
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From: Richmond, VA
I'm gonna guess based on the lack of care that the last person put into the job, that at the very least you have those wires pushed all the way on, and seated better than before. Bikes will run with loose plug wires, but they will run better when the wires are properly seated to the coil.
Last edited by bikerlaw; May 18, 2011 at 09:51 PM.
Tourer
Joined: Sep 2010
Posts: 471
Likes: 9
From: Far NorCal
Love them old dual fire popping johnny's....welcome to the real Harley motor.
I always heard they fire a mill-second apart, but I never put mine in the lab.
Probably what bikerlaw said.
Once after an indy put new plugs in my bike I found the spark plug screw-on top connectors completely loose. Bike ran much better.
Have fun and good luck.
I always heard they fire a mill-second apart, but I never put mine in the lab.
Probably what bikerlaw said.
Once after an indy put new plugs in my bike I found the spark plug screw-on top connectors completely loose. Bike ran much better.
Have fun and good luck.
Elite HDF Member
Joined: Sep 2007
Posts: 4,468
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From: Bluffton, South Carolina
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Club Member
Joined: Sep 2010
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From: Beyond Fucital
Don't think so. Not sure on the degree difference, but you need to be around 180 degrees so the cam turns. Wouldn't that make more sense?
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Elite HDF Member
Joined: Sep 2007
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From: Bluffton, South Carolina
Older harleys had what was known as a "wasted The coil fired both cylinders whenever a cylinder called for a spark. The cylindrer that wasn't on the combustion stroke just fired into a cylinder with burnt gas in it, hence the monicker "wasted spark". Harley claimed for years that there was no advantage to single fire system, then went to them claiming better spark, less emmissions, smoother running!!! Kind of makes you wonder doesn't it.
I for one like single fire systems as you can do a lot more with it. Hope this halps.
I for one like single fire systems as you can do a lot more with it. Hope this halps.
Club Member
Joined: Nov 2008
Posts: 5,481
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From: Georgia
Older harleys had what was known as a "wasted SPARK. The coil fired both cylinders whenever a cylinder called for a spark. The cylinder that wasn't on the combustion stroke just fired into a cylinder with burnt gas in it, hence the monicker "wasted spark". Harley claimed for years that there was no advantage to single fire system, then went to them claiming better spark, less emmissions, smoother running!!! Kind of makes you wonder doesn't it.
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