...saying engines run lean in cold weather is just nonsense and aperantly wasn't "Googled" properly by gryphon lol
Boooya, GTAM forums and I and all the other readers and posters have little patience with those who post misleading (or just plain incorrect) information.
Especially in the Technical forum, where it is assumed or hoped those without knowledge will not guess poorly in response to legitimate questions.
Internal combustion engines, all else being equal, run leaner in cold weather and richer in hot weather!
This is just a fact. It is first-day stuff in 'carb tuning 101' class (which you apparently never attended)...
I was tearing down and tuning banks of Keihin carbs back in the 1970s. I have forgotten more about carburetion than you'll ever know.
And I can WRITE the tech info that YOU, Boooya, should probably have 'Googled' heheh...
Now I don't mean to rag-out on you friend, but you might consider being a little more humble.
L8R