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[Fireguy]

As a rule, how often do you replace your plugs? Are there any signs that would indicate they are going bad?

[GregKhougaz]

Here is a very informative article for you:  NGK Spark Plug Tech Support.

[RJW]

Every year ,their cheap.

[sixgun95]

How often you replace them on your car?  About that much!

[porthole]

How often you replace them on your car?  About that much!

75,000 - 100,000 miles might be a bit much for the bike.

[grc]

How often you replace them on your car?  About that much!

I don't think so.  Any late model car has platinum plugs and a pretty powerful ignition system, and they can go 60k to 100k miles on a set of plugs.  A Harley has a relatively anemic ignition system by comparison, and standard plugs.  I would suggest that 10k to 20k would be good on a Harley.


Jerry

[dlaws01]

Every other ride.

[lilcoot]

"Every other ride."

Perhaps, running a little rich, maybe?     Sounds like my old dirt bikes.

[trwtow]

"Every other ride."

Perhaps, running a little rich, maybe?     Sounds like my old dirt bikes.

must be long rides

[Fired00d]

As a rule, how often do you replace your plugs? Are there any signs that would indicate they are going bad?

Every 5k when bike gets serviced.

 
Ride Safe,
Fired00d
 

[Skillet]

I change mine at 10,000 miles.

[harleyteam]

according to my dealer,,,,,, if the bike is running good,  DON'T F--K WITH IT.

have 30,000 with originals, and runnin strong.

[MKW]

Its random for sure.  I changed my originals out after 10K but no real indication-just made me feel better.

[wideglidejoe]

On my '05 Wide Glide, I took it from 88 to 95 when it had 7,000 miles on it.  10.5:1 cr CP forged pistons, S&S gear drive 585 cams, NRHS heads, etc.  107 hp/107 tq.  The dyno operator suggested I put in a hotter plug, so he used V-Rod plugs; sorry I don't have the plug number in front of me right now.  It  was still running great at 47K miles.  I thought I better change them, so I put new V-Rod plugs in it, and can't tell it runs any better.  Plugs still looked decent with 40K on them.  I kept them for a road spare.

Prior to the 95 upgrade, I had an occasional check engine light.  Code was rear plug misfiring, even tho' you couldn't feel or hear it misfiring.  The engine light only came on if I was really pushing it.  Normal riding, the light would eventually clear itself.  Replaced the plug, problem fixed. 

If plugs were getting old, needing replaced, misfiring, etc.,  wouldn't the diagnostics give you an check engine light?

[15CVOSG]

is upgrading to SE plugs worth the money...you think any better performance out of them....and while asking...how about the SE plug wires...thx