tuning carb

trying to get carb tuned , got the idle-low side good 12.4 , bottom/mid a little rich 11 , mid/top richer 9.8, w.o.t. goes super lean 15--16
I going back up to 160 main next, my question is do I need a smaller pilot jet the moose kit I have had the needle with the grooves when I started it was on the next to bottom I now have it next to top groove trying to lean out the mid am I thinking wright on this

I have had better luck running the stock Yamaha needle than the aftermarkets

A moose kit is just a dynojet kit. I would recommend going back to the stock needle. That needle sucks.

Stock needle with all shims and washers below the clip.

Nate
Alba Racing

I put the 160 main back in got rich ,on the way back to shop I took the air box lid off an snorkle thinking it would lean out a little instead it got richer , that just f--d up all my thinking decided I need a cold one an walk off before I be a on this sombitch will start over later

ok finished 1st cold one got 2nd an been pondering this shit , first I think I need to make sure slide is working right, because if its not this would cause being rich
second, I think I will set up with open air box then see what snorkel does to it will try to get 3in for snorkel before it goes back on

Cold ones help... By removing the aibox lid you have now taken away the vacuum that lifts the slide. It will no longer be able to lift correctly and can drastically effect air fuel. Remember that you can only flow as much air as your greatest restriction.

Nate
Alba Racing

Jeff, Sorry I didnt have time to take a pic of the 3" snorkel, putting out fires all day. Nate is right you need the air box lid for proper vacum for the slide to work. That's why on the 720 you really have to run 3" snorkel.

'

ok will put back on in moring after I get back from bone doc, but that explains
why it got richer when I took off the lid, that helps out the pondering a lot

ok got home and going to start again , starting with air box lid on snorkel off
will recheck an set from low idle to w.o.t. see if this changes things

you to need to state rich also so put the needle high like 2 size bigger pilot and main and should be running rich all the way through then. that way u have a starting point because your a/f reading are all over the board.

with the air box lid on an no snorkel is very rich in middle an will lean out on the top , I think the slide is the main deal believe its slow on opening making rich in middle an when w.o.t. it opens an it goes lean . I went down to 160 main trying to help the rich right before w.o.t. an in turn made the top lean out , going to try to get smaller pilot jet sizes an a 162.5 main , I 've already drilled the slide to 1/8 on both holes , slide has some scratches /wear marks on side may see about new slide to see difference

The slide not opening quick enough will make it lean. Lowe your needle. One shim

Jeff, sounds like your getting close, Stick with it and you will be smoken Rzr's for lunch!

thanks Mike been trying every thing with this , Jason when it leans out it is w.o.t. which should have the needle all the way out of jet an in turn if I raise the needle it would make the middle-upper more rich before w.o.t. I think this is right , but I agree that there's something up with slide . Trying to locate more jets now