When I read this thread, I was thinking it absolutely had to be a joke. I've been here since 2000, and I can honestly say I've never read anything this ridiculous. The whaaaambulance should have been fired up a long time ago, for sure. I can't believe it.
Idling for a few seconds is ok but anything after that is going to load up the plug although you should be able to clean it off with a few revs.
Anyone loading up plugs is just not jetted properly to account for low signal. Sure, these CV type carbs don't like to work at low rpm since the same condition (signal) exists as at high rpm--a straight shot through semi-open reeds into the heart of the matter. But, it's doable--and my KX500 will idle all day long without 'loading up', as they say. Then again, my particular bike likes it real lean down low and rich up top.
Orton--AV GAS is the worst sludge you can run in a 125. That fuel's tendency to resist detonation is at least partially due to its high aromatic hydrocarbon content. Problem is, aromatics (benzene, toluene etc.) give poor throttle response either by affecting the distillation curve or flame front propagation--don't remember which, or both? The better fuel for a 125 would allow you to advance ignition timing as far as possible without causing detonation--since they're RPM monsters. AV GAS works great in planes where hum drum rpm's eliminate that concern.