I have a tight section at my local, from a hair pin up a hill to a tight right- right combo. I sometimes instead of lifting for the first part of the right- right bit, I choke.
Its probably not doing anything for lap times but its a relatively slow part of our circuit and easier to do it there than into the faster corners (the Local doesn’t have any sweeping corners off straights that are easy to choke in).
I really only do it if i think the engine temp on my KA is getting too high. A cylinder head temp of 160’ is supposed to be the top safe temp, but I don’t like going over 150’
@Peter_Zambos Funny story, about line pinching
The KA isn’t supposed to need it either, but of course everyone does it. Pole sitter was pinching his line as we went through the tracks cut through. A rock bounced up hit his shoulder and trickled all the way down his arm and got stuck in the gap between the throttle lever and the bit that the cable comes out on the side of the carb, this jammed the throttle closed. Couldn’t figure out what was wrong, so we started the race with out him. Apparently the swearing was quite impressive.
It made for a good weekend, he was super quick anyway but he had to start from the rear for most of the event, it was a great game for me, to see how long I could hold him up. Not long usually, and showed his class in the way he cut through the field to either win or be second.
So in that case the answers are - “when” never through the cut through. and “why”- because something you would never expect to happen will!