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**sunilg** · 01-11-2012, 12:18 AM

Query approved.

**shoeb2015** · 01-11-2012, 08:48 PM

Try swapping the carburetor of a pulsar which is giving good mileage and then check the mileage of your bike ,if it increases then you have a messed up carburetor which can be repaired or re-tuned but if there is no significant change in mileage then other part(s) may be faulty.

Check it and report back.

**karthickj** · 01-12-2012, 01:16 PM

Thanks

My suggestion is - Can I buy a new carburetor and fix it. But my doubt is, If I buy a new one again is there a need to tune the carb or it has company original setting? if it has original setting so that can this bike can give proper mileage? If the tuning required means again its a head ache. no one s a good mechanic by understanding the basics and tuning.

One more heads up. When i was in this tuning process one of the mechanic told me that the timing need to be adjusted. He told he s going to adjust the timing. After that my bike pick up was too low. Is timing is related to mileage.

What is timing?

**Pinaki** · 01-12-2012, 02:35 PM

Timing is the matching of the spark plug's firing so that it fires (sparks) exactly when the air-fuel mixture in the cylinder is at maximum compression , i.e the piston is at the maximum travel (tdc) of the compression stroke of the 4-stroke engine -- and just then the plug fires to ignite the mixture and ensure near full combustion .

**psr** · 01-12-2012, 04:52 PM

Originally posted by karthickj View Post

Thanks

My suggestion is - Can I buy a new carburetor and fix it. But my doubt is, If I buy a new one again is there a need to tune the carb or it has company original setting? if it has original setting so that can this bike can give proper mileage? If the tuning required means again its a head ache. no one s a good mechanic by understanding the basics and tuning.

One more heads up. When i was in this tuning process one of the mechanic told me that the timing need to be adjusted. He told he s going to adjust the timing. After that my bike pick up was too low. Is timing is related to mileage.

What is timing?

You can't adjust the timing and it has nothing to do with your present problem...
First of all check and clean your Air Filter...if the FE does not improve then You have to try and adjust the AFR screw by turning it HALF turn CLOCKWISE from present position..
The AFR (Air Fuel Ratio)screw makes the AF change with the setting...Turning it Clockwise will make the AF mix lean, ie.,less petrol and Anti Clockwise rich...So to get better mileage turn the AFR screw Clockwise to make the AF mix lean..if you lean the mix too much you will have starting and running problems...so do only half turn clockwise.
Here is a pic of Pulsar carb to explain...

**karthickj** · 01-12-2012, 07:14 PM

Hi Sir ,
Hope ur a good techie sound mechanic.

I have changed the Air filter, both the Spark plugs. Now i don't have starting prob in the morning. Normally i used to kick start in the morning.

I dont get the beat sound and the engine sound. very low tup tup tup sound. This happens when I start the bike after long time rest. If I raise the bike then It will give normal pulsar sound. RPM will be 1100.

As u shown in pic the pulsar carb I can see the AF srew (AF adj). The same screw I used to tune. That is in bronze. The position in the pic is the same I have. And when I tight it fully in clockwise it reaches the maximum position in the same horizontal position which shown in the picture. So from that point now I have turned anti clockwise 6 full turns. that is 360 degree.

Is this correct. How shud I check it is correct?

In another site I found the correct mixture is 1:3 ratio. Air 3 and fuel 1 ratio.

One small hint. When I bought this bike I told that when I put speed,power petrol I used to get 60 kmpl. Unleaded petrol 55 kmph petrol. So during this period when I kick 1st time It wont start. At least I need to struggle 4 or 5 times.

Can u track something with this. Is there a separate screw for controlling the AIR input?. PLs help me. It will be thankful to you. If any pin or needle or any stuff inside the carburetor will help in mileage?

**shoeb2015** · 01-12-2012, 07:48 PM

Check The reed switch because a faulty switch will give you less power and mileage.
-Clean the carburetor and check for any clogging and wear of jets.

**abhinavsri01** · 01-12-2012, 08:02 PM

With my 150 UG4 I used to get arnd 55 kmpl till 1st service only..

After that I could never touch 50kmpl. Though when I bugged the service center guys, the 100ml can always showed 5.2kms..

After that, now odo at 25k, I have learnt to be happy if the bike gives 42-45kmpl..

If something else can be done to improve this, It would be like a rebirth for my bike..

**karthickj** · 01-12-2012, 08:07 PM

OK sure I will try that. Is there anything that i need to change inside the carburetor like the jet/needle

And what is the normal mileage should attain when I switch the petrol tap from main to off. So that I can check the mileage improvement easily with switch off the petrol flow

**karthickj** · 01-12-2012, 08:09 PM

in this free service only these mechanics making problems to our bike. Or else it wud be great bike

**aargee** · 01-12-2012, 09:52 PM

Originally posted by karthickj View Post

In another site I found the correct mixture is 1:3 ratio. Air 3 and fuel 1 ratio

You got to TRUST PSR Ji blindly!!!

**RanjithMN** · 01-12-2012, 10:12 PM

Originally posted by karthickj View Post

Hi Sir ,
Hope ur a good techie sound mechanic.

He is more than that.Blindly do what he says

**Pinaki** · 01-13-2012, 02:05 AM

Originally posted by karthickj View Post

...I have changed the Air filter, both the Spark plugs. Now i don't have starting prob in the morning. Normally i used to kick start in the morning.
I dont get the beat sound and the engine sound. very low tup tup tup sound. This happens when I start the bike after long time rest. If I raise the bike then It will give normal pulsar sound. RPM will be 1100.
As u shown in pic the pulsar carb I can see the AF srew (AF adj). The same screw I used to tune. That is in bronze. The position in the pic is the same I have. And when I tight it fully in clockwise it reaches the maximum position in the same horizontal position which shown in the picture. So from that point now I have turned anti clockwise 6 full turns. that is 360 degree.
Is this correct. How shud I check it is correct?
In another site I found the correct mixture is 1:3 ratio. Air 3 and fuel 1 ratio.
One small hint. When I bought this bike I told that when I put speed,power petrol I used to get 60 kmpl. Unleaded petrol 55 kmph petrol. So during this period when I kick 1st time It wont start. At least I need to struggle 4 or 5 times.
Can u track something with this. Is there a separate screw for controlling the AIR input?. PLs help me. It will be thankful to you. If any pin or needle or any stuff inside the carburetor will help in mileage?

Earlier your carburetor was tuned too lean , which was giving you great fuel mileage of course . Now somehow you have managed to fiddle it too rich .

Originally posted by karthickj View Post

OK sure I will try that. Is there anything that i need to change inside the carburetor like the jet/needle
And what is the normal mileage should attain when I switch the petrol tap from main to off. So that I can check the mileage improvement easily with switch off the petrol flow

Nothing .. just follow what psr'jee said , half/quarter turn clockwise ... then check the fuel-mileage by reserve-to-reserve method by filling just one liter after you hit reserve . Then adjust another quarter or half turn again , and check mileage again ... and continue like this until you find the optimum mix . It'll take time & patience, no shortcuts (i.e forget about the fuel tap idea) . And do be gentle when you use a screwdriver on that screw . Realistically , you should arrive at a fuel mileage between 45-50 kmpl shortly, and get easy starts in the morning too

.

**psr** · 01-13-2012, 10:42 AM

Originally posted by karthickj View Post

Hi Sir ,
Hope ur a good techie sound mechanic.

In another site I found the correct mixture is 1:3 ratio. Air 3 and fuel 1 ratio.

One small hint. When I bought this bike I told that when I put speed,power petrol I used to get 60 kmpl. Unleaded petrol 55 kmph petrol. So during this period when I kick 1st time It wont start. At least I need to struggle 4 or 5 times.

Can u track something with this. Is there a separate screw for controlling the AIR input?. PLs help me. It will be thankful to you. If any pin or needle or any stuff inside the carburetor will help in mileage?

I hope so too for your sake

The ideal AF ratio which is called Stoichiometric is 14.7:1 ie., 14.7 parts of air to 1 part fuel.
http://en.wikipedia.org/wiki/Air%E2%80%93fuel_ratio
HIGH FE is actually not so good for the engine Life....If the max FE of a P150 is 50 try to tune it for 45 Km/lit. This is because the Pulsar 150 is an air cooled engine and the little amount of unburnt petrol is used by engine to wash the bore and make it cool down . Running an engine at high temperature is detrimental to the engine's life....

Originally posted by Pinaki View Post

Earlier your carburetor was tuned too lean , which was giving you great fuel mileage of course . Now somehow you have managed to fiddle it too rich .
Nothing .. just follow what psr'jee said , half/quarter turn clockwise ... then check the fuel-mileage by reserve-to-reserve method by filling just one liter after you hit reserve . Then adjust another quarter or half turn again , and check mileage again ... and continue like this until you find the optimum mix . It'll take time & patience, no shortcuts (i.e forget about the fuel tap idea) . And do be gentle when you use a screwdriver on that screw . Realistically , you should arrive at a fuel mileage between 45-50 kmpl shortly, and get easy starts in the morning too

.

Absolutely correct..and thank you for the confidence ...hope i live up to it.

Originally posted by aargee View Post

You got to TRUST PSR Ji blindly!!!

Originally posted by RanjithMN View Post

He is more than that.Blindly do what he says

Thanks for the confidence shown....hope I live up to it .

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My pulsar tuning gone bad

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