Venture Flash codes not in any manuals

Runs good until long running heats it up. Figuring its due to temp and not being able to compensate in -1 to 0C temperatures at 60km/hr cruising. Power drops off and eventually surges back then off again. When its seems good pushing it hard gets to 80km/hr fine and not exceeding 7k but seems to bog trying to push above that easily at least which it should. Leaving it stopped for a short wee break revives it. It feels like fuel issue. Most speeds easily achieved within 6-7k rpm. It may be going slightly higher but certainly not over reving.

Now that I have it back the -20C temp are gone. LOL I alt least got a 200km drive yesterday. Generally its fine expect when I get the loss of power at a steady speed attained already.

Is this carb totally automatic or are there manual adjustment the mechanic may not got right after cleaning them?
 
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