I just did Dave's mods on my 2004 xr 650l I did the new jets (55\158) de-snorkeled it, and pulled the Baffle from the back While in the carb, I also drilled the slider to 5\32. When I put it all back together, I was noticing some popping when decellerating (using the engine as a brake) I think this is called afterburn...though I am not sure cause I'm pretty new at this. and I only rode for 10 minutes. I did miss one step in the mods (the one with the washer for the pin) How crucial is that washer step. is the popping just really noisy because I took the baffle out? Any replies would be greatly appreciated.