Carburetor Thread

[pronoy_banerjee]

U can see the screw from where fuel tap is located, its of golden color.

Buddy my bike is a 2004 model,

there is no golden screw, everything there is gray, so i need an image... could you help me out

[anmol_1990]

U can see the screw from where fuel tap is located, its of golden color.

[pronoy_banerjee]

Trouble locating the A/F screw

Hey guys, I have a Karizma,

could you help me locate the Fuel screw on my bike by posting a picture or may be explaining.??

The RPM goes up easily but takes long to come down, Im sensing an untuned carb..
Waiting for your replies..

[MotionFreak]

what to do about bikes w/o tacho?
I think i'll have to judge by my ears only

[pioneeraron]

Nice piece of info guys..Keep it up!! I guess its a pain when it comes to tune a classic cbz's carb..The H.H.A.S.S guys dont do proper tuning..im riding widout tuning my bike past 2yrs..im getting an avg of 33-35kmpl..it was 40kmpl before..and now the response is not that great and theres lots of harshness when revved..anyone help me out with this tuning thing?? I only know the idling screw...cant locate the AFR screw..does this tuning procedure hold for cbz also?? Cuz the cbz carb's are a slide type rather than those CV types...correct me guys if im wrong

[RascalAngel]

Thanks Abhi!

[abhijeet080808]

^^ Yep that is the one.

[RascalAngel]

Is the screw highlighted in red circle the A/F screw?(Pulsar 150 Mikuni)

[aargee]

Ok, will try that this evening. Thanks for the education & ideas

[psr]

Makes a perfect sense & no wonder I couldn't think in these lines I understood my mistake. I'll go get a VM22's needle. But on the other hand, what happens when I try using bigger needle? I know I cannot use the top or may be even 2nd from top's position, but still, just want to understand. Any insight is appreciated. Tks.

A larger needle will not go inside and seat properly.It will get jammed ....If you want to know...insert the original 22's needle in the 22's emulsion tube till 3/4th and see the amount of gap or play between the emulsion tube and the needle...you wil understand..

[aargee]

Makes a perfect sense & no wonder I couldn't think in these lines I understood my mistake. I'll go get a VM22's needle. But on the other hand, what happens when I try using bigger needle? I know I cannot use the top or may be even 2nd from top's position, but still, just want to understand. Any insight is appreciated. Tks.

[psr]

I'm under the impression that the round/flat slide needle controls the flow of AF mixture during the idle. Is my assumption right or incorrect?
The needle controls AFR, but after 2,000 RPM.

So I got a new needle y'day & unfortunately it was smaller (of VM20s). This means, the top most point of VM20's is the second position of VM22. So I positioned the new needle (VM20) to top most position thinking what bid deal, just that the AF mixture would get richer. But I was wrong.

This morning, the vehicle behaved as if its starving for air or fuel or even both & I was really surprised as why this is happening. Switching ON choke seems to be easing out.
You can't put a 20's needle in 22. They have different Taper profiles,and it will cause the needle to be slanted in the emulsion tube and when you raise throttle it will be dancing inside the tube to give varying Mix each time. The emulsion tube and Needle come as a Matched set , and should be used as a matched unit...

Appreciate if anyone could point me what went wrong with my assumption or actually what is going on inside the carb. Tks.

answers in bold

[aargee]

I'm under the impression that the round/flat slide needle controls the flow of AF mixture during the idle. Is my assumption right or incorrect?

Problem - I've a heavy flutter (along with jerks) after certain rev (which I'm unable to say the RPM due to lack of RPM meter) especially when the throttle is closed. So after a lot of adjustments, I placed the pin lock to the top most, trying to make the AF mixture leanest during idle. There was some success that the flutter has come down considerably along with jerk that is much better than before. What I expected was a hum when the throttle is closed, which I'm unable to obtain till date. The carb I'm using is VM22.

So I got a new needle y'day & unfortunately it was smaller (of VM20s). This means, the top most point of VM20's is the second position of VM22. So I positioned the new needle (VM20) to top most position thinking what bid deal, just that the AF mixture would get richer. But I was wrong.

This morning, the vehicle behaved as if its starving for air or fuel or even both & I was really surprised as why this is happening. Switching ON choke seems to be easing out.

Appreciate if anyone could point me what went wrong with my assumption or actually what is going on inside the carb. Tks.

[psr]

Its the IDLE screw, not the airscrew. Sry about the miscommunication ji!!!
Throttle, cable including screws are new & well lubricated in this case.

Something seriously wrong with me :banghead:

Take a break get some rest.

[aargee]

Its the IDLE screw, not the airscrew. Sry about the miscommunication ji!!!
Throttle, cable including screws are new & well lubricated in this case.

Something seriously wrong with me :banghead: