Carburetor Thread

[dip097]

Help needed regarding assembling carburetor.

Hi guys, recently i dismantled and assembled carburetor of gs 150r to remove power drop at 5000 RPM. But now there is no enough power past 5000 RPM. My doubt is that there might me a vacuum leak at the output side of the carburetor. I suspect that an O-ring might have gone missing. Below is the picture of outlet side of my bikes carburetor. You can see a brown liquid (Petrol) at the face of the carburetor and there is no O-ring on it.

I have also attached the picture of outlet side of a carburetor that i found on the Internet. It has an O-ring on it.
What do you guys think?, Does it look like my carburetor is missing an O-ring?. Please help.

[ron_9191]

Yamaha SS125 carburetor options. Need help.

Hi Everyone,

I have a Yamaha SS125 and I have been experiencing something really weird with it. It is somewhat brand new as it has done just 3000km on the odometer but it seems to have an almost endless problem with erratic idling. I had it checked with the Yamaha service so may times, they would do something, the thing idles clean for sometime and then again Looks like the carburetor in this thing has a mind of its own.

I was thinking about giving it a carburetor swap and was wondering if anyone out here could help me with a few suggestions. The SS125 runs a Mikuni BS24 (24mm) carburetor by the way. I am also trying to figure out if anyone else have been facing the same problem and how they got rid of too. If I could do the same too, I could keep the BS24 and still enjoy my ride. Please help.

Cheers!

[DesiRider]

Re: [UT]: Tuning your Motorcycle Carburettor.



I have a RE classic 350. Is the screw marked in red the fuel screw? The bike does not have a tachometer so how does one go about tuning it? Any slightly different instructions for bullets or the same apply to all to the dot?

[sanket779292]

Re: Carburetor Thread

Hello friends,
I own a pulsar 150 UG 4.5, i want t know how to tune the carburator to its default position, can anybody post the complete guide preferably with pictures. I tried many times (reading from the net) but couldn't get it right nor the so called mechanics (ASC as well as outside)

Regards

[The Monk]

Re: Carburetor Thread

Topic Approved

Made this a Universal Carburetor Thread, discuss anything and everything to do with carbs. If a thread already exists, then please let me know. Thanks

[smrutisourav]

Carburetor Thread

Yesterday i saw my bike's carburetor drain pipe fallen in ground near my bike. This was done by a small street dog. Thing is installing back was very difficult. For that i would need to open many parts of the bike. Like air filter box, tank cover and tank.

So i wanted to know what are the possible consequences of not having carburetor drain pipe installed.

It doesn't matter still if it helps my bike is pulsar 200ns

I want help from everyone so please don't merge this post with ownership thread.

Sent from my Nexus 5 using Tapatalk

[Legend Racer]

Re: [UT]: Tuning your Motorcycle Carburettor.

bump......

[murlidhar]

Re: [UT]: Tuning your Motorcycle Carburettor.

When i gave full throttle .. the bike carb main jet on. what about the pilot jet is he stop flowing petrol during full throttle when main jet on...?

the main jet is controlled by accelerator cable and pilot jet is controlled by idling screw. now answering to your question "no"

[Legend Racer]

Re: [UT]: Tuning your Motorcycle Carburettor.

how to tune a crab without tachometer. with tachometer we can adjust and set the needed rpm in engine, but without it? i have seen good mechanics listening to the engine and tuning it. but how? i got a chetak and an rx 100. how to tune them? they both dont have tachometer. I can tune bikes with tachometer.

[royal racer]

Re: [UT]: Tuning your Motorcycle Carburettor.

When i gave full throttle .. the bike carb main jet on. what about the pilot jet is he stop flowing petrol during full throttle when main jet on...?

[amitmalve]

Re: [UT]: Tuning your Motorcycle Carburettor.

In most 4 stroke bikes, it is fuel screw.

There is a simple & crude way of determining this. Just find the location of the screw on the carburettor. If it lies between engine & carburettor it is fuel screw. If it lies between carburettor and air filter, it is air screw.

Correct, it is a fuel screw

[pwcrulez]

Re: [UT]: Tuning your Motorcycle Carburettor.

Wow good stuff, I am sure to try these stuff out.

[Adarsh_Bk]

Re: [UT]: Tuning your Motorcycle Carburettor.

Could any on tell me whether the pilot screw found on honda bikes carb (viz. unicorn, dazzler, hunk/cbx extreme) is a air screw or a fuel screw?

Afaik its an air screw. The cv carbs work by controlling the throttle butterfly valve using air flow (vacuum) which in turn opens the slide based on what the engine can handle. So the screw should be controlling the amount of air.

In most 4 stroke bikes, it is fuel screw.

There is a simple & crude way of determining this. Just find the location of the screw on the carburettor. If it lies between engine & carburettor it is fuel screw. If it lies between carburettor and air filter, it is air screw.

[DukeDey]

Re: [UT]: Tuning your Motorcycle Carburettor.

Could any on tell me whether the pilot screw found on honda bikes carb (viz. unicorn, dazzler, hunk/cbx extreme) is a air screw or a fuel screw?

Afaik its an air screw. The cv carbs work by controlling the throttle butterfly valve using air flow (vacuum) which in turn opens the slide based on what the engine can handle. So the screw should be controlling the amount of air.

Sent from my GT-I9100

[amitmalve]

Re: [UT]: Tuning your Motorcycle Carburettor.

Could any on tell me whether the pilot screw found on honda bikes carb (viz. unicorn, dazzler, hunk/cbx extreme) is a air screw or a fuel screw?