From: "Charlie England ceengland7@gmail.com" <flyrotary@lancaironline.net>
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Date: Thu, 25 May 2023 13:58:55 -0500
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Subject: Re: [FlyRotary] AR2592 gap
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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On 5/25/2023 8:13 AM, Finn Lassen finn.lassen@verizon.net wrote:
> For those of you who use the AR2592 spark plug in the Renesis, do you 
> use the 0.6mm gap the plug comes with? I bought 8 of them some years ago.
>
> I've been using the stock plugs (RE7A and RE9B) for maybe 100 hours by 
> now. Experienced a brief 200 RPM drop on last takeoff. Wondering if 
> it's time to change plugs. Or re-gap the stock plugs to what?
>
> What can I learn by looking at plugs?
>
> Best way to clean them?
>
> Finn
Since no one else is jumping in...

I don't remember ever swapping plugs in either of the RX7s I used to 
own, but based on general info for IC engines, the general appearance of 
the 1st and 3rd look to me like they're running way too hot.  Here's one 
site about 'reading' plugs:
https://www.lazerhelmets.com/lean-spark-plug-chart/

At $5-$6 each, it's hard for me to justify cleaning/gapping an old worn 
plug, especially if it looks pretty rough.

Charlie

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