Sterling...
 

How do you modify the Nikki? Not a step-by-step thing, I mean what changes do you make to it? And, since I'm pretty clueless about carbs, can you explain a bit of carb theory???

His site has a good explanation of the modded nikki.

Hope this isint too simplistic of a basic explanation.
http://static.howstuffworks.com/mpeg/chainsaw3.mpg

Accompanying article
http://auto.howstuffworks.com/question377.htm

thats a good way to tell how a carb works. it works on the same idea of a vacuum(is that right sp?) hold down for a mill.

you have a T in a air line the air flows at the top of top of the t and it pull air from the bottom of the T causing a vacuum effect. but on a carb it pull's gas in to the motor.

Pretty much. ;)
It's called the "Venturi Effect", and it was first quantified by Daniel Bernoulli in the 18th century. Giovanni Venturi, a generation or so later, is credited with developing apparatuses to harness that pressure differential that occurs; Hence the "venturi".
Venturis are used for everything from carburetors to nuclear power plant cooling towers.

Are you getting a modded Nikki or a Sterling. They are different.:P

I don't believe Carl builds carbs. I think he did a lot of the R&D work along with Sterling, but the carbs are all built by Sterling. Yaw has been out of the business for many moons now.

Yep. Yaw's out. I wish I knew what that guy knows.

Carl did. I have one on my '85 (was on my now departed SA). :icon_tup:

Better get your order in quick before Dennis gets too swamped. It's not an overnight deal, but it's worth the wait.

The return orifice in the inlet banjo bolt must be blocked.
What kind of pressure are you putting through there?

-What the level in the fuel bowls? It's very strange to see that.

...I honestly can't even understand how that can happen. Basically the only way that can happen without the bores filling up is that all four fuel circuits would have to be completely blocked.

Is there also fuel dribbling out of the nozzles into the barrels?

Sure, it could simply be sticking floats. Happens all the time to carbs I've shipped. Tapping on the banjo bolts while the fuel pump is running usually unsticks them.

Have you tried asking Sterling? Either email him, or go to his forum. He keeps telling people that, but I keep seeing these threads pop up....