Remove the main jet access nut in the float bowl and turn the fuel on.  May sure there is enough constant flow to keep the float bowl full.

A 20 degree change in intake temperature should require about one main jet leaner.  Has your fuel been setting for a month or so and all of the good stuff as evaporated and is trying to run on an abnormally high mixture of premix oil. 


My definition of a bog is when the engine is lazy or does not make power and does not sputter.  If you have a bog it is usually lean.  If it sputters at 3/4 to full throttle it is rich or has an ignition problem.