I've noticed several people experiencing problems with the 426 missing at 1/4 to 1/2 throttle, including myself. I'm just wondering what effect removing the silencer and putting in a YZ throttle stop has on the stock settings. To be more direct, does removing the plug make the bike run richer, or is that problem a function of the other 101 variables that affect the way this bike runs? I've also been told the idle speed setting can affect how the bike runs at lower speeds. I turned mine up a bit, and it doesn't backfire as much when shutting down at half throttle after a hard hit. Coincidence? I'm waiting to do some serious adjusting until I get a good moderate temp day and a spot to ride around 3000 feet, but I want to try to avoid monkeying with adjustments that don't need fixing. Any helpful advice for the best place to start and what changes to expect would be appreciated. I also asked earlier if putting the silencer back in after changing the throttle stop causes excessive exhaust pressure problems at ludicrous speeds. I haven't seen any problems mentioned yet.