If your running a really over size carb for the bike just 10 degrees will make a difference.
Like the guy early said it really don’t mess with stock bikes ..
I had a 72cc bike that stock had a 16mm carb ..after stage 5 porting and a spanny etc I got to a 30mm carb that ran great in Florida on the normal hot sticky mid day 85 to 95 and 80% humidity with 105 main ,,and a dark brown plug .., but if I rode out at 8am and it’s 72degrees … ish the plug would turn light light tan to gray in the middle .. the 110 main would fix it ,,,, then 60 degree morning 115 main or it would lock up ..
I REALLY don’t no your term 4 stroking ?
As in what the bikes doing ??
If you are running a to bigger jet for the air temperature the plug will be really dark brown and at the end of each gear if you hold it out to get maximum REVS it will feel like it’s pulling back and sound bad ,, same if your a no gear bike but at max speed .. if this is what you mean … as it 4 strokes as you say … roll the throttle back just like .1/16 to 1/4 and if it clears even picks up a little speed … your to fat ..on the main by a little bit .FOR that day that air temp ..
Yep 2 cycles …. Like a women …. A hot one that knows it ..
hard to get it just right … but when you do
( oh yer baby ) !!!!!