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2010 honda crf250 head

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I noticed a small hole about 1/8 " in diammeter, on the right side of the cylinder head , about 2 inches behind where the head pipe bolts on.

I can see this hole in a picture in the owners manual , but it does not say what it is for.

Does any one know ???

thanks

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im pretty sure youre talking about the drain hole for the spark plug. if water gets down on top of the spark plug it will drain out instead of just sitting there and possibly causing some problems.

this is krony506's bike on here but it shows the hole. and it is the drain for the spark plug.

IMG00045-20100211-1816.jpg

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Yes, that is the hole I was referring to. Thanks for the info and picture.

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yep, drain hole.

its a good idea to pull the plug cap out and blow through it every now and then with compressed air to prevent clogging.

i try to do mine everytime i wash mine, i blow the moisture out of plug cap also.

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Nah, that's the "about to seize" indicator. When the plug that's in there from the factory pops out like that it's time to sell me that bike is all...

👍

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