Richard, I didn't realize it until just now.. We may have finally put all the pieces of the puzzle together regarding decel popping.

Remove the PAIR valve system OR NOT - But get the idle AFR in the 12's with the screw or bigger pilot jet and the screw.


So we will need your pilot jet and fuel screw settings for the 12's at idle..

 

Ha it'll be a while before I pull the 34 off. I've been doing so much carb swapping lately I am ready for a break. I'm using an XR200 fuel screw btw.

 

Of course, but if you're running X main, and X needle and your AFR numbers are good, the pilot size needs to be included in that information. If you change the pilot size, you will change your overall jetting and AFR numbers.

 

I don't know ..you don't read about the pilot interacting above say 1/4 throttle or so. Checking the online charts-there are some showing the pilot working all the way to WOT, but there are just as many charts showing it stops at about 3/8 throttle.

It probably depends on whether there is enough vacuum effect as the slide goes higher to pull fuel through the pilot's tiny orifice. Which is why some charts show it having a limited range.

It maybe something to keep in mind though. I'd say tune the pilot for starting, idling, and low speed; then let the other jets do their work after that.

I think my pilot's a little rich because it doesn't like any choke when starting (80 deg mornings) but the idle a/f is very good; the pumper Mikunis will start on choke though. I think I tried a size smaller 34 CVK pj before, it did start better on choke, but it was popping on decel.

 

I posted somewhere on KF recently that I thought it was odd that the bike was showing a/f numbers of 13 and sometimes 14 at WOT with a 125, then it dropped way down to below 12:1 with the 130 main jet

A few days after adding the 130, I'd richened the needle a half notch with a shim (needs to go richer a net full notch btw still lean at various mid throttle accels) and I'd wondered if that was the reason for such a large richer change in a/f when going to the 130..

So today I stuck the 125mj back in and yahoo! the WOT a/f ratio is right at 12.2. Perfect for my 10% ethanol Shell gas. Must have been the needle moved higher a half notch that unblocked some WOT main jet flow.

By the way I left the TPI unhooked today just to see if it affected the rpm limiter, and it didn't.

 

It's a 38

 

Thanks.
Yes, the pilot circuit never goes away. It flows in addition to the other circuits. On my race bikes, if I make a change to the pilot, I have to make the opposite change to the main in order to keep it from running too rich on top.

If I recall, my 07 bike had a 40P/125 main and N1TC needle. That would explain it.

 

Interesting..

Well I just added an .005" shim under the needle to raise it up a tiny bit but not an entire notch to maybe add a little more fuel without upsetting the jetting that's in place (it already had a .5mm shim under it and still does). I had the .005 shim stock here and it drilled without leaving a burr so it was something fun to make up.

Too many carbs, so little time

 

Here is some good info I use in setting up carbs
Photos