Spark Plug Question
Stellar HDF Member
Joined: Aug 2009
Posts: 3,212
Likes: 212
Maybe the question is, if you bought a six year old car with only 2800 miles on it (<500 miles/yr), would you consider that normal? The lack of use can be worse for a vehicle than one that's ridden daily and you can expect to find parts that have simply aged out.
The factory Service Manual calls for your plugs to be replaced every 10,000 miles. The Harley branded plugs are made by Champion, the xref # is RA8HC. And yes, the RA8HC meets the Harley 20 ohm spec. and they're about $1.50 ea. at most auto parts stores.
FYI - I have 84,000 miles on my bike running the RA8HC's, no problem.
The factory Service Manual calls for your plugs to be replaced every 10,000 miles. The Harley branded plugs are made by Champion, the xref # is RA8HC. And yes, the RA8HC meets the Harley 20 ohm spec. and they're about $1.50 ea. at most auto parts stores.
FYI - I have 84,000 miles on my bike running the RA8HC's, no problem.
I would run the new and gapped plugs for a while and see if they start looking black/nasty. That would mean you need to start looking elsewhere for problems. If they are fine, just chock it up to old plugs. It happens.
I too run the RA8HC plug based upon CHarley's recommendations and it is a fine plug. No problems whatsoever, and it sure makes tuning carbs cheaper when I don't have to spend $12/chop to put in new plugs.
Tourer
Joined: Nov 2010
Posts: 309
Likes: 13
From: Lawrenceville, Ga.
"The bike is stock except for the exhaust which appears to be after market. The plugs were both completely black on the ends. They were a little damp with gas but not enough where it should have been flooded. As for the stock Harley Plugs are they an absolute necessity? The closest Harley dealership is over an hour away and because of work its nearly impossible for me to get there while they're open."
I wonder of someone put oil in the cylinders, knowing it would not be ridden for a while? Or put it away and left the fuel petcock on.
I wonder of someone put oil in the cylinders, knowing it would not be ridden for a while? Or put it away and left the fuel petcock on.
Club Member
Joined: Feb 2007
Posts: 16,320
Likes: 306
From: Boynton Beach, FloriDuh
"The bike is stock except for the exhaust which appears to be after market. The plugs were both completely black on the ends. They were a little damp with gas but not enough where it should have been flooded. As for the stock Harley Plugs are they an absolute necessity? The closest Harley dealership is over an hour away and because of work its nearly impossible for me to get there while they're open."
I wonder of someone put oil in the cylinders, knowing it would not be ridden for a while? Or put it away and left the fuel petcock on.
I wonder of someone put oil in the cylinders, knowing it would not be ridden for a while? Or put it away and left the fuel petcock on.
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