06-19-2024, 11:18 PM | #16 |
Join Date: Feb 2021
Location: Kansas City
Posts: 2,659
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Prodigit is joking. The dark stuff on the threads of the plug might be oil, but you read a plug at the electrode and porcelain insulator, NOT the threads. And that part of the plug looks pretty good. No reason to clean it with a wire brush! There is nothing there.
Your M is low miles. Over time the porcelain will discolor to off white. But if it gets a chaulky residue, too lean. If it gets sooty, too rich. Yours is neither. But I think that's a cheap Torch plug. Get a good plug in there. NGK DR8EA (7162) is a good one.
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-NOS 2020 KTM 250SX (2-stroke motocross) Last edited by Thumper; 06-20-2024 at 11:37 AM. |
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06-20-2024, 09:44 PM | #18 |
Join Date: Aug 2013
Posts: 328
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The thread occasionally can get discoloration on it as well. It all depends on how deep these generic plugs can screw into the block, with a piece of the threaded section entering the combustion chamber.
Either way, brushing it off gets you a newly looking plug, that'll be easier to read. I myself just listen to the exhaust tone, and smell if a bike is running rich or lean. Last time I pulled my plug, it was golden brown, with a slightly darker brown on the bottom than on the top . |
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