Carburetor Thread

[psr]

Thanks sir. But with any pictures are really appreciated. Without pics, its kinda difficult to visualize things.

[aargee]

Yes, that looks much much better. Will go through them tomorrow morning. Tks again for your continued help sir.

[psr]

Thanks sir. But with any pictures are really appreciated. Without pics, its kinda difficult to visualize things.

Use the second link..the explanation is much more detailed with picture..

[aargee]

Thanks sir. But with any pictures are really appreciated. Without pics, its kinda difficult to visualize things.

[psr]

Sorry for a noob question, where exactly does this venturi come into picture in a carb, both functionality as well as physically? Pls help understand sir. Tks.

Here is a link which explains everything in detail and in correct perspective.

http://www.lbfun.com/warehouse/tech_..._explained.pdf

and also this link:

http://www.justkdx.dirtrider.net/printcarbtuning.html

[aargee]

Yes...a larger venturi,than stock, reduces the Venturi air flow velocity, so can fill only lesser amount of air and fuel.

Got my mistake. Tks sir.

If the flow velocity is high,then even with the smaller jet bike will run near normal.

Ok, so how about changing the jet size to something even smaller, say like 115 or less? Then will I be able to near my stock carb setting?

Sorry for a noob question, where exactly does this venturi come into picture in a carb, both functionality as well as physically? Pls help understand sir. Tks.

Unless the CC of engine is increased, merely fitting a larger venturi Carb will result in lower performance.

True. Completely agreed through your education + my experience

[psr]

Ok, help me understand on this front...
180 main jet with venturi size 28 is throwing too much fuel, so I lower the jet to 165 (which is also stock size for Rx135), so why isn't the fuel flow getting lesser? Ofcourse, its clearly evident that the fuel flow is less because the vehicle CAN NEVER get beyond 60 kmph at top gear. Why is this happening? Is it the same narrow hose dia, larger hose dia issue? Pls help me understand this point sir. Tks.

Yes...a larger venturi,than stock, reduces the Venturi air flow velocity, so can fill only lesser amount of air and fuel. If the flow velocity is high,then even with the smaller jet bike will run near normal.
Unless the CC of engine is increased, merely fitting a larger venturi Carb will result in lower performance.

[aargee]

Thanks sir for the response, but after this post there were several experiments that I've done (will post it on my Rx rebuild thread soon) & I've firmly learnt that, TM28 is an overkill on stock Rx135 & that's why you see a Arial bold request on my signature

1. with 180 main jet when you open throttle there is excess petrol going in causing flutter..please lower the throttle needle by a notch.

Yes, I've done this & the needle was at top most position & even then there's a jerk, BUT, the intensity was much lower.

2.with 165 main jet you are getting lesser petrol when you open throttle and so the mix becomes very lean..try lifting the throttle needle by one notch,with 165 jet...

Ok, help me understand on this front...
180 main jet with venturi size 28 is throwing too much fuel, so I lower the jet to 165 (which is also stock size for Rx135), so why isn't the fuel flow getting lesser? Ofcourse, its clearly evident that the fuel flow is less because the vehicle CAN NEVER get beyond 60 kmph at top gear. Why is this happening? Is it the same narrow hose dia, larger hose dia issue? Pls help me understand this point sir. Tks.

[psr]

Experts - appreciate a little help here. This is my carb on my Rx. The model is Mikuni TM 28 running on 180 main jets (not sure what's the pilot size). The issue is, the vehicle flutters like mad; assuming the mixture was running too much rich, it was decided to change to 165 mains, which is the size in stock Rx. After changing to 165 mains, last evening the issue is horrible; after certain point of twisting the throttle, the engine shuts off (here's a video & write up as well).

I don't know what I need to be doing; some guidance is really appreciated. Tks.

There are two different things happening here. ...
1. with 180 main jet when you open throttle there is excess petrol going in causing flutter..please lower the throttle needle by a notch.
2.with 165 main jet you are getting lesser petrol when you open throttle and so the mix becomes very lean..try lifting the throttle needle by one notch,with 165 jet...
I am assuming all other settings are stock...

[TOTALLER]

Hiiii ....dude can u pls tell me where i can get a good performance carbeurator..... Something like mikuni ..... In banglore

[aargee]

Experts - appreciate a little help here. This is my carb on my Rx. The model is Mikuni TM 28 running on 180 main jets (not sure what's the pilot size). The issue is, the vehicle flutters like mad; assuming the mixture was running too much rich, it was decided to change to 165 mains, which is the size in stock Rx. After changing to 165 mains, last evening the issue is horrible; after certain point of twisting the throttle, the engine shuts off (here's a video & write up as well).

I don't know what I need to be doing; some guidance is really appreciated. Tks.

[vishalsun]

Homda DIO

Have anyone of u tried tuning HONDA DIO!! i need some help out here..

[mithun]

the red circle is the idle screw and the the blue circle is the Air screw/Fuel screw.. (This carb image is of BAJAJ CT100)

Almost all the Bajaj bikes(after year 2000) are having the same carb style.

[vishalsun]

Pls dont mind the imae quality!!

the red circle is the idle screw and the the blue circle is the Air screw/Fuel screw.. (This carb image is of BAJAJ CT100)

[Prabhakar150]

Carb tuning for p150

Hey guys i want to know the factory setting of P150 ug4. I screwed up my carb. How many turns it should from completely closed (leanest possible) position? Turn in the sense means half or full rotation of screw? Pls dont advise mechanic visit.
It would be really helpful..
Waitin for experts answers..