rich or lean

[quadzilla87]

got my 87 quadzilla fired up yeasterday and still runs horrible bored 10 over trinity pipe 39 pwk carb new reeds new plug runs good at high rpm but in 1,2,3, it stumbles real bad almost as if it is missing do ineed more jet then a 170 and where should i set the air fuel mixture screw.

[burgiebird]

Im running a 190 main and 1 1/2 turns out. It sounds lean. How does the plug look?

[bean86]

Id say you are lean also, thats what i am running in 250R. Its a little rich but not bad.

[quadzilla87]

the plug looks like tan about the way my 4 stroke looks like my predator has a 150 but anything much bigger then that it starts to flood i tried a 180 in the quadzilla and when you open it up it just starts cutting out so i whent to a back 160 and it runs like a bear

[fulltiltrider]

Depending on elevation, Im at about 1700ft, I'd move the clip down one notch on the needle and go with a 185 main 1.5 turns on the air screw. Do a plug chop, 5th gear wot hit the kill switch pull in the clutch. Check the color , tan is probably lean you want a nice chocolate color. Get your main right first then we'll go from there

[quadzilla87]

i played with the carb today it had a 60 pilot and 160 main needle was 3 one down seemed to run okay plug was tan so i tried to move the clip down and put a 50 pilot in and whent to a 175 main but now it cuts out when you are wide open at high rpms and has a bog to it screw is around 1.5 turn

[fulltiltrider]

I would say that the 60 pilot was ok. maybe a little rich. I have a 52 in my 250r. Something just doesn't sound right. When I did my friends stock zilla we had a 39mm with a 58 pilot and 172 main. You are at a little lower elevation with a pipe you should be a bit richer than that.

[quadzilla87]

i put 60 back in tried a 172 main 1.5 turns on screw seems to be better now it seems that run better with a 160 the any thing but i figured that was lean because most of you guys are clear up in 180 to 190 range

[fulltiltrider]

Originally Posted by quadzilla87

i put 60 back in tried a 172 main 1.5 turns on screw seems to be better now it seems that run better with a 160 the any thing but i figured that was lean because most of you guys are clear up in 180 to 190 range

Try giving your air screw another 1/4 to1/2 turn. But be careful you can easily lean her out pretty fast with the air screw

[jarnold106]

I just finished jetting mine. The motor is stock, but I have reeds and FMF pipe/Sil with a PWK 39MM carb at around 1000 ft. I also run a K&N Air filter with the air box lid off, here are my specs:

Main - 175
Piolet - 52
Needle - 2nd Position from top
Air Screw - 1 1/4 Turns out