(Also posted in Jetting forum.) Bike: 2004 WR450F with the following power mods: YZ exhaust cam, Vortex ignition, YZ exhaust, open airbox, JD Jetting , R&D Power Bowl, Zip-Ty carb mod. I was having problems with “the bog ”. After buying the R&D Power Bowl, the bog was getting better, but still there. So, in a final attempt to get rid of it completely, I sent it to Steve at Zip-Ty for the carb mod. Steve’s great to work with – never in a hurry to get off the phone and answers all your questions. Their carb mod now includes a completely new AP linkage. When I installed the Zip-Ty modded carb, almost all of the bog was gone, but some was still there. Called Steve, and he walked me through tuning the adjustable leak jet in the Power Bowl. Bog gone! Seems the best combo for me is Zip-Ty + Power Bowl. Yes, I could save money on the Power Bowl by pulling off the carb bowl and messing with the leak jets, reinstalling, testing, and doing it all over again. But, now I don’t need to pull the bowl – ever. My only adjustments will be the needle position and jets through the bowl drain bolt. So glad to be done with the bog! Call Steve at Zip-Ty. They sell the Power Bowl and a good price, so you can send it out, and they’ll have it back to you in a week, ready to go.