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Rejetting for YZ Pipe

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Hey guys, I obtained a YZ 450 stock pipe for my 2003 WR 450. I would like to install it and see how the bike starts and runs before I start messing around with jetting. What do I look for to determine if I need to rejet? Im assuming if it starts backfiring or starting hard? Sorry for the stupid questions but I have never messed with jetting and I dont want to ruin anything.

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