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06 CRF450R bottom end knock?

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Just bought the bike last year and it has very low hours, just barely broken in. Haven't even taken it out, Anyways it was hard starting, finally got that taken care of, I've added the boyesen quickshot and that seems fine.

Problem is there is a very definate "knock" at idle that sounds like it is coming from the bottom end, and it will sometimes cause the engine to stall at idle. It is not constant, it happens perhaps every 15-30 secs, and veries. Could this be related to the transmission? Oil levels are fine and oil is clean. Both engine and tranny.

My friend thought it was running a bit hot too but we idled it for a fairly long period. Any input would be appreciated. We seem to have got the backfiring problem fixed as the pilot was probably a bit learn. Thanks.

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all the motors "knock" what your hearing likely is just the new 4 stroke engine

they do make knocking noise slightly-just the engine working ,dont idle your bike to long

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