Help on diagnosing lean condition

PS You do know that the needle is connected to the slide, right?

When the throttle plate is opened, engine vacuum is applied to the carb throat. The bottom of the slide has a hole in it. When vacuum exists, air is pulled through that hole so that creates a vacuum above the slide diaphragm. This naturally pulls the slide upward.

In order to make that happen, the underside of the diaphragm is connected to outside air or airbox air through that wide crescent port at the carb inlet. The diaphragm has vacuum on top and intake air on bottom, so it moves up.

The diagram you posted doesn't show the hole at the bottom of the slide, but you mentioned you altered yours by drilling it so you know it's there.

Oooh I see, it's that kidney bean port is how the air is supplied to the diaphragm.

My crude calculations say that in order to maintain laminar flow at 75mph, you'd want an opening of about 0.4 inches in diameter so I'm going to try making a restrictor that fits inside the pod and see how that works out.

Every now and then I check eBay for an airbox and I got lucky today to find that there was one for sale that actually included the cap. I'm going to try to get the pod works but I will finally have a stock air box. Pretty bummed though, those things aren't cheap.

YOU WON'T REGRET IT
Steve

TexasKZ wrote:

I did a similar thing to this with an XS400; clamped pods onto the stock intake runner tubes. Prior to doing this I couldn't get the bike to run for crap regardless of what jets I installed. On the XS the filters are behind the side covers, one per side. I couldn't afford the proper filters thus the pods. At any rate, I think it's a good approach assuming there is room.

Here are some visual representations of what I was trying to explain about the interrelatedness of tha various carb circuits.

www.kzrider.com/forum/3-carburetor/61106...rottle-stages#807484