Bump for a good question.
Sorry, I do not know the correct answer.
How many miles on thoes plugs? Track / street?

 

Just under 31K on stock plugs. (I know, you're supposed to change them every 8k).

80% commuting, 20% spirited canyon rides, the occasional clutch wheelie

I change oil every 2K, usually Mobil 1 Tan cap 15-50, sometimes Valvoline motorcycle oil 10-40 JASO MA spec (when in stock at AutoZone). Other than that, hardly any other maintenance done on bike (besides tire changes, and I did the 520 -1/+2 conversion this past weekend)

 

06 raven ...probably nothing wrong with your coils ....nothing wrong with testing..but you can get three different testers and come up with different results....the tests posted are not within specs but .... it depends on the test equipment....I 'm sure you
have replaced your plugs since you have them out...

 

Just an update in case someone is searching.

IT WAS THE IGNITION COIL!!! (the #2 coil)

The UPS guy dropped off my new OEM part today. (A big thanks goes out to Ron Ayers for selling this part at half of what my local shop wants to charge me.) I plugged it in and started up my bike and it sounded normal for the first time since August 5th.

On August 5th, the #2 coil resistances were 1.8 Ohms for primary and 8.42 k-Ohms for secondary (then 8.35 a while later). Secondary should be between 8.5 - 11.5. Even though it was just slightly below spec, the low resistance WAS IN FACT an indicator that this coil was going bad. I tested the #2 coil today and the secondary was down at 8.09 k-Ohms. I have been riding it every day even though it was probably ill advised. The stuttering and missing definitely got worse, which was reflected in the resistance reading today.

As a sidenote, the service manual states the primary coil resistance should be between 1.19 to 1.61 Ohms. All of mine were consistently at 1.8 Ohms. My bike runs fine. If your SECONDARY resistances are a little low, then that is the likely the problem.

Hope this helps someone down the road.

(By the way, it helps if you take a Sharpie and label your coils on the clear/yellowish plastic top part just to prevent any confusion)

 

Your values are almost within specs. What meter are you using to take your readings with? Meter accuracy? I don't think your problem is coil related.

 

Well, it ran like crap for 6 weeks. I replaced the ignition coil that was below spec. Now it runs perfectly.

I'm not sure why you don't think it was the ignition coil.

Keep in mind, the secondary resistance values are KILO-OHMS, not Ohms. i.e. 8090 Ohms isn't "almost within spec" of 8500 - 11,500 Ohms. My other coils are at 9600 Ohms and higher. The new one from Ron Ayers read 9690 Ohms. The #2 coil at 8090 Ohms is clearly well below spec.

I have a Sperry digital meter, purchased from Home Depot on August 5th of this year (it's brand new and they're decent meters).

 

did you change plugs at the same time as the new coil? 'cause the center electrode on your old plugs look well worn to me.:dunno

 

I changed plugs on August 5th. Plugs weren't the (entire) problem though a plug change was definitely well past due. I replaced with the stock CR9EK and though the engine sound improved a little, the hesitation and rough idle did not go away but rather continued to worsen until I replaced the ignition coil.

 

cool bro!:thumbup looks like you got it sorted :rock
btw, i like the cr9ek plugs. i use them too.:hellobye

 

Are you sure those were the stock plugs for a '06 in your picture? Should'nt they be a fine wire iridium electrode?

 

The service manual states on page 3-23 (page 100 of the PDF) that NGK CR9EK are the correct plugs. That's what I pulled out of my bike. That's what I replaced them with.