CRF450R Carb Problems

So I just finished building the bike and put it back together. It ran fine when I used it as a dirt bike last year and since then all I have done is put on the Yosh full exhaust, high comp 13:1 piston, and check the valves to see that they were in spec. It also has a K&N air filter and the airbox is cut...alot. I am getting popping on accel and decel and the header is turning red. Here is the video. It is an 03.

Glowing header is normal. Thin wall pipe needs air passing over it to cool it. Do not let it just run sitting still.

Open pipe does not muffle the pops that have always been there. You can ensure you have no exhaust leaks and live with it. Or put the stock pipe back on.

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