I just wanted to follow up on this old note of mine.  I had an inspection done by a local shop in May 2011 and therefore did not think the plugs would be a high probability item.   I've had hard starting and idle problems all summer.   When a plug stopped firing yesterday I pulled all of them and the gaps were set to something less than 0.010 on 10/12 plugs.  There were some balls of (lead?) deep into some of the plugs, whitish deposits on the insides and some of the gaps were shorted of course.     These are massives, RHB32E on the IO-550N.  These plugs had about 70 hours since the "condition inspection".  I forgot to check the resistance that one owner wrote about but I did test them under pressure and all fired properly after cleaning.  

As suggested here, I did not go after the injectors.  

On 2011-08-22, at 1:28 PM, Ron Laughlin wrote:

> You might want to do a "cruise power" LOP mag check before pulling injectors. It's more likely a plug(s) or plug harness problem than an injector. Also, a "GAMI spread" test should be done. Please refer to the GAMI website for instructions.
> Ron
>
>
>
> On Aug 22, 2011, at 9:09 AM, paul miller wrote:
>
>> Question: On my IO-550N which I run LOP almost all the time, it runs quite well on the stock injectors.  It now has almost 500 hours and I do not believe the injectors have ever been cleaned.    I am getting some small vibration at LOP now and one or two cylinders are getting colder than the others leaning.  I would like to hear from people with experience on how they cleaned, what materials or ultrasonic cleaner was used and whether they replace the o-rings and where to get them.
>>
>> Paul
>> Legacy, Calgary
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