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Virtually the only time you will get a false reading of the spark plug colour is if you have just started the bike from cold.Check the plugs after a ride or take a plug spanner out with you and stop somewhere safe and check.
If ever you have the carbs off you may want to do the modification I have done,
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I have ground off both sides as per the picture of the substantial carb bracket to allow easier access to the idle mixture screws and have ground an angle on a small screwdriver to use as an idle adjuster tool.
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HTH
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If ever you have the carbs off you may want to do the modification I have done,
I have ground off both sides as per the picture of the substantial carb bracket to allow easier access to the idle mixture screws and have ground an angle on a small screwdriver to use as an idle adjuster tool.
HTH
