4 is what it should be

but youl probably find that 6 or 8 will make it run better.
the mark that looks white in the photo looks like 4degrees to me. tdc, 2 then 4.

tdc is the thickest/deepest groove, 2's are the smallest, with 4's being the 2nd thickest to the tdc.
re carb- mixture screw in means leaner (less fuel/air going into engine) out means richers....

will probably be around 1.5- 2 truns out from fully in when setup properly, but time the engine first, fuel comes second.

if when tuning the carb the engine revs rise above 1000rpm, stop and bring it back down to 800rpm using the speed screw, then continue tuning the mixture.



"Understeer" is when you hit the fence with the front of the car.
"Oversteer" is when you hit the fence with the rear of the car.
"Horsepower" is how fast you hit the fence.
"Torque" is how far you take the fence with you.