Air mixture screws...where abouts?

[berger]

I was wondering where exactly the air mixture screw is...I think I know where it is, but I want to be sure. Is it the recessed screw at a nine o'clock position from the main jet?

I know that I should seat it lightly and then turn it out 1.5- 2 turns...depending on the jets I have, which I will verify before I do anything.

[Dwight]

Assuming that you have the stock CVK's on your bike, the air mixture screw is located in the recess on the bottom of the carb - you can get to it WITHOUT removing the fuel bowl from the underside of the carb. 1.5 - 2 turns from a SOFT seat of the screw is a good point to begin with... Some CVK's come with a plug in the recess which you'd need to drill out to gain access to the air mixture screw.

Just curious - are you having a problem of some sort with the fuel delivery system on your bike - or just a general question?

Dwight

[Gummiente]

I was wondering where exactly the air mixture screw is...I think I know where it is, but I want to be sure. Is it the recessed screw at a nine o'clock position from the main jet?

No, that's the idle jet - do NOT unscrew that one. Leave the float bowl on, the air mixture screw is on the outside of the carb body and lies directly underneath the throat closest to the cylinder head. Like Dwight says, 1.5 to 2 turns is a start point.

[berger]

Assuming that you have the stock CVK's on your bike, the air mixture screw is located in the recess on the bottom of the carb - you can get to it WITHOUT removing the fuel bowl from the underside of the carb. 1.5 - 2 turns from a SOFT seat of the screw is a good point to begin with... Some CVK's come with a plug in the recess which you'd need to drill out to gain access to the air mixture screw.

Just curious - are you having a problem of some sort with the fuel delivery system on your bike - or just a general question?

Dwight

Thanks Dwight.

I am experiencing the occassional run-on or burps on shutdown. I want to check the plugs and make sure I am not running rich and I was told to take a look at the jets and verify the mixture screw....in comparison to the jets.

Berger

[berger]

I was wondering where exactly the air mixture screw is...I think I know where it is, but I want to be sure. Is it the recessed screw at a nine o'clock position from the main jet?

No, that's the idle jet - do NOT unscrew that one. Leave the float bowl on, the air mixture screw is on the outside of the carb body and lies directly underneath the throat closest to the cylinder head. Like Dwight says, 1.5 to 2 turns is a start point.

Cool, I thought I saw a pic somewhere and it appeared to be on the outside of the float bowl.

Thanks Mike.

[BillyG]

It don't matter what jets you got...1.5 to 2 turns out will work...and a half turn difference is going to cause your problem.

[berger]

It don't matter what jets you got...1.5 to 2 turns out will work...and a half turn difference is going to cause your problem.

I just took a look at my plugs, and while the top is tan brown, the rim of the plug is a little black. I think it might be running rich.

[Thunderstruck]

Here is a photo with every thing labeled. Pictures help a bunch.

[BillyG]

You are not looking at the rim of the plug to "read" them (partial lie...but not for what you are looking for). Only the insulator and if it is tan you are good to go.

[berger]

Here is a photo with every thing labeled. Pictures help a bunch.

That is exactly what I needed! Thanks!

[berger]

You are not looking at the rim of the plug to "read" them (partial lie...but not for what you are looking for). Only the insulator and if it is tan you are good to go.

Thanks Bill. It does look pretty tan to me.

[greenmachine]

The range of fuel mixture adjustment on them screws isn't enough to make the engine run " rich " with stock jets anyways.

What will make one not fire clean is: plug not gapped wide enough.... plug wire terminations at either end not secure... leaky float valve .... air filter partially clogged with too much oil or sumthin like that there.... oil fouling from poorly seated or busted rings .

YMMV
AFAIK
FWIW
ETC....

;-)
kermitski

[berger]

The range of fuel mixture adjustment on them screws isn't enough to make the engine run " rich " with stock jets anyways.

What will make one not fire clean is: plug not gapped wide enough.... plug wire terminations at either end not secure... leaky float valve .... air filter partially clogged with too much oil or sumthin like that there.... oil fouling from poorly seated or busted rings .

YMMV
AFAIK
FWIW
ETC....


kermitski

Ya, I am going to check it all.

Thanks Kermi

[greenmachine]

I forgot the simplest one ......


BAD GAS !


;-)
kermitski

[berger]

I forgot the simplest one ......


BAD GAS !



kermitski

I thought of that one, so I make sure to go to different stations and only use premium.

Berger