Dent in stock muffler?

You can't read spark plugs without leaded fuel and expect to see anything but white. Give up the mythology and jet based on how it runs, by gas analyzer/dyno results, or based on the experiences of others with the same model and locality specifics.

There's a 'sticky'

At The Top of the Index

I run unleaded and used the plug color thing in helping me jet my bike :thumbsup:

It says right in manual to use that theory.

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