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Drz400sm small pops on decel and engine braking

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Hi guys I'm sure there is tons of info already on this. Sorry. But I did the 3x3 jd reject followed the instructions. Full yoshi rs2 with silecencer/spark arrestor removed. The bike runs great no idle issues no issues going WOT. When clutch is in and I snap the gas quick it has a loud pop not sure if this is normal. It also pops when letting off the gas. I'm just trying to make sure I'm not lean. Header is golden colored. Blueish the 6" closest to head. Was gonna go check my plug buts it's a 2017 with 600 miles on it I'd expect it to be pretty clean? Help!

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Okay yeah that's what I was thinking since it's running great. Thankyou!

Probably a dumb question but How can you tell if it gets too hot?

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