Spark plug colour query.

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7/16/2017 10:22 AM

I jetted my sons sx65 using the pro circuit chart before he rode today and the bike sounded like it was running awesome but looking at the plug I'm a little worried it might be a bit on the lean side. What's your thoughts? Photo

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7/16/2017 12:01 PM

The plug look old, but the color looks ok.

Paw Paw

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7/16/2017 12:13 PM

Cheers paw paw. The plugs only been in the bike a couple of rides, I noticed it was quite rich last time out so tried the different jetting today.

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7/16/2017 2:19 PM

Can't properly read a plug just looking at the top portion of the insulator. The "coloring ring" ,is down at the base of the insulator. A proper scope or cutting the threaded portion of the plug to expose the insulator, is the only true way to read plug coloring.

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7/16/2017 2:21 PM

Tan to brown is the sweet spot

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7/16/2017 4:02 PM

it looks kinda dirty and im asuming its pump gas which if it is is fine if thats straight race gas its still to rich

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