Very few run when cold enough to matter much on pre 850. 750 are all around jetted richer and can do without chokes easier.
Tickling/flooding is essential. Once fired up the engine is still running on a rich/high fuel level but going down to normal quickly.
The 850 is entirely different. Balance exhaust pipe mainly for noise reduction also gave a bit of low RPM freeflow which induced scavenging with resultant leanness,to compensate for both effects. The lean 4 ring .needles AND cutaway spray tube.This pair work together to make a much leaner system that calls for a choke as much more essential
If you run "no 850 balance pipe" than it all goes out the window,,, run 750 jetted carbs
