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what size radiator cap?

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The OEM cap should have enough pressure(the factory designed them that way) I guess before you buy any thing look to see if he one you got is damaged if it is try a new OEM one.

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Look for the metric presure. (KG/CM) You will probably find it a 1.1, and I know a KX500 uses a 1.4. My grandsons KTM 65SX also uses a 1.4.

A 1.1 is a 15 lbs cap a 1.4 is a 20 lb cap. a .9 is a 13 lb cap. Higher pressure will give you higher boiling point, but there can be too much pressure also.

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