Oil bolt loosened up and un knowingly ran out .it doesn't knok when revving.
Sounds like a faulty connecting rod at it's beginning. This knocking will escalate with use to louder knocking.Take off the cylinder head's cover, the camshafts and the chain tensioner to check them for damage. If they are ok it would be wise to proceed to an overhaul repair and check everything inside and replace the connecting rod with a new one.
SOURCE: What Oil to Use in My CRF 250X 2004
If you have the owners manual check that, otherwise ring a bike shop and ask them for advice.
SOURCE: are the frames the same? 05 crf 250r and a 07 crf
would plastics on a crf 450x be different than on a crf450r 05
SOURCE: Trying to remove the carb. All is ready but the
SOURCE: how do i jet my crf 250x?
pull the carb, remove the main jet, take to a motorcycle shop and ask for the next size up and the one after that. Replace jet and ride, if it feels better try the next one up and so on until you no longer feel a better result, then go back one.
SOURCE: CRF 250x 2004 Smoking a bit
Besides the worn rings, a cylinder expands when hot adding clearances between cylinder walls and pistons skirting and rings
microgrooves wear into the cylider walls further allwing cp,[pressed gasses and oil to escape and go where they arent wanted, needed, try a thicker oil maybe? as the piston moved up and down the air flow through the engines cases causes blow by or maybe its burning out the pipe as described, high rpms make the engines interior like a little air pump not just in the cylinders but the crankcase as well as the pistioons displacing then rising sucking and so on.
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