It is not my video, just a good one I found on youtube.
1 gallon of gas to 4oz of oil is a 32:1 ratio of mixed fuel.
32:1 is an excellent ratio to use for petroleum pre-mix oil and an engine that has been broken in.
If your engine is still new (less than 500 miles) you should use a 25:1 ratio.
5.12oz of oil to 1 gallon of gas.
Rich is relating to how much fuel the carburetor adds to a given volume of intake air.
Rich = too much fuel.
Lean = not enough fuel.
A basic starter for beginning to tune the carburetor:
To lean out the mixture raise the clip on the slide needle. Doing this lowers the needle into the needle jet on the floor of the carburetor's throat and reduces the fuel added into the incoming intake air.
Make this change one needle notch at a time until it runs better.
After the engine runs good, you need to do a plug chop to determine if the mixture is not too lean.
Operating an engine with the carburetor tuned too lean can quickly do serious, permanent damage.
This is why you do the adjustments one needle notch at a time to sneak up on the perfect tune, not jump a couple of notches at one go.
Again, this is just a basic starter to begin tuning an NT carb.
NT carbs are stone simple to work with if you are willing to learn.
http://www.google.com/cse?cx=partne...gsc.tab=0&gsc.q=tune NT carburetor&gsc.page=1
This is also an excellent read:
This procedure is very commonly needed and I am glad to hear that you were willing to keep at it until the jet was sized correctly.I had to tune to the extreme. Solder the Jet shut and redrill it to a smaller Jet number and keep doing that till i got it right.
lol, thanks man. it works like a champ. I build cars and do alot of custom fabrication work anyways. So its nothing to keep at it till its right.This procedure is very commonly needed and I am glad to hear that you were willing to keep at it until the jet was sized correctly.
Some folks end up pulling their hair out and quit after a few tries.