So in regards to my previous thread, i had my 400 rebuilt. 11:1 wiseco, stg2 hot came, crf timing chain, new valve-train. it runs, and runs good. But it makes a weird noise. not im not talking about the valve tick (which got louder from the stg 2 came. which i expected). its making a weird knock noise from the bottom end.
at first i though it might either be a rod bearing or or a crank bearing, but it 1) doesnt do with when its cold, only after it warms up, and 2) if it was a crank or a rod bearing, i would expect it to get a lot worse as the motor climbed through the RPM's but it doesnt. i cant hear the noise anymore once its on the throttle.
i embedded a video i took of the motor running. the noise that i feel as a knock is not as loud in person as it is in the video (taken with a galaxy note 3). I dont know if this noise was there before and its louder now because of the more aggressive cam? or it was there and now im just over analyzing any small noise cause i just rebuilt this. My builder checked the crank and doesnt think it was bad and thinks it cause of the more aggressive cam and because the jetting was lean.
anyone else ever hear a noise like this?
thanks for any input you guys can give me
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