06 yz450 f knocking sounds

i have a question. i put a fmf 4.1 pipe on my bike. i have changed the main jet to a 170 and the pilot to a 50 and brought the clip down to the 5th slot to get rid of the popping sound and it worked. But now i hear a pinging in the engine. it is like when a rocker arm in a car that is loose or worn out. is this normal i do not know if something else is wrong or if this is normal can someone help me please do not want to blow up the engine

i have a question. i put a fmf 4.1 pipe on my bike. i have changed the main jet to a 170 and the pilot to a 50 and brought the clip down to the 5th slot to get rid of the popping sound and it worked. But now i hear a pinging in the engine. it is like when a rocker arm in a car that is loose or worn out. is this normal i do not know if something else is wrong or if this is normal can someone help me please do not want to blow up the engine

that seems like very stout jetting - especially for the heat I see in Nevada weather reports.....

try a 45/48 pj and 165/168 mj

i am not in nevada right now i am in mo. I was just wondering if that pinging could be from bad gas or low octane gas. or is it from the jetting and main because this is what fmf told me too do?

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