Query regarding fuel efficiency - xBhp.com : The Global Indian Biking Community

xtremebiker · 05-21-2010, 07:13 PM

Hello,
Owner of Pulsar 200, my bike isn't returning optimum average from last 4000-5000 kms. It has drastically reduced down to mere 28 kmpl

from 42 kmpl. My bike has done 18000kms up till now.
Lately had some problems but now resolved, like changed my chain sprocket set, changed the clutch plates but not the pressure plates as they were fine because the pickup and top speed were affected.

But the bike isn't returning proper average.

Plz help me out. Urgent as i have to travel a lot and i struggling to get good average.

Aryan · 05-21-2010, 08:14 PM

Query Approved.

PRANAV D · 05-21-2010, 11:11 PM

Is your bike completely stock? (without any additions like K&N filter wid bigger jets,FFE etc.)
have u checked whether the carburettor is running a rich mixture?
Is mileage the only issue or are u experiencing any other problems while riding? (as those problems might help in detecting mileage problem)
What about engine oil is the bike drinking too much oil too? try monitoring the engine oil levels.
Members here would be able to help you better if you elaborate on above points.

jd666 · 05-22-2010, 12:56 AM

have the tappets been checked and adjusted?
- have you replaced the spark plug and filter ( if not in a long time, then a good time to do it now )
- Are your tyres leaking air?
- Are you getting your bike filled from the same petrol pump only?? ( if yes, please change pump and check )

xtremebiker · 05-22-2010, 10:21 AM

Relating to above queries :
1. My bike is completely stock, no mods done.
2. Haven't been able to check the carburetor mixture, will check it soon.
3. Mileage is the only issue.
4. No, the bike isn't drinking oil at all (Using Motul 300v 15w50), level no problem.
5. Have duly replaced the spark plug and air filter.
6. No, bike tyres aren't leaking any air (Psi : F - 25, R - 40).
7. Yes I had been using the same petrol pump for the last 3 yrs (Indian Oil), no xtra premium only normal unleaded petrol.
8. The tappets have been checked and adjusted, since i got the whole head clean and also checked with the engine compression (mentioned in the service book i.e. to be checked at every 15000kms)

Hope I resolved all ur queries genuinely, now plz help me out guyies.
Thanx.

NitinGirish · 05-22-2010, 11:15 AM

40psi for Pulsar's rear tyre is standard recommendation? Unrelated to the problem, but I am just curious.

PRANAV D · 05-22-2010, 05:42 PM

Well from my side i can only say check the carburettor mixture as that is the only thing remaining unchecked, rest all seems ok. If it is running too rich a mixture then you will notice-
1. Too much low end torque and thumpy/beaty engine sound especially at low rpms.
2. Electrode of the spark plug will be dark black in colour. Ideally it should be brown/light brown in colour which indicates optimum mixture.

kurtrules · 05-22-2010, 05:51 PM

If the carb is tuned fine, then I believe it is a case of faulty valves and valve guides. Result: low mileage and black smoke from the exhaust Take it to the ASS and get it checked up.

ashwin208 · 05-23-2010, 04:11 PM

NitinGirish is right, 40 psi is too much for the rear tyre.
I have a 220 and the recomended pressure is 28F and 32R(with pillion).
I however keep it at 30 and 34 so that the pressure is never too low even if its not been checked in a while.
Xtremebiker - check the recommended pressure ( will be on the LH side swingarm or in your manual) and keep them 2 counts higher just in case. Might not solve your mileage issue but better not to run on over/under inflated tyres....

xtremebiker · 05-23-2010, 04:15 PM

Ashwin man i had been upto this pressure from a long time but not faced any trouble.

05-21-2010, 07:13 PM	#1 (permalink)
xtremebiker Biking, approved by DAD Join Date: May 2010 Location: Indore, MP Posts: 19	Query regarding fuel efficiency Hello, Owner of Pulsar 200, my bike isn't returning optimum average from last 4000-5000 kms. It has drastically reduced down to mere 28 kmpl from 42 kmpl. My bike has done 18000kms up till now. Lately had some problems but now resolved, like changed my chain sprocket set, changed the clutch plates but not the pressure plates as they were fine because the pickup and top speed were affected. But the bike isn't returning proper average. Plz help me out. Urgent as i have to travel a lot and i struggling to get good average. Last edited by Aryan; 05-21-2010 at 08:14 PM.

05-21-2010, 08:14 PM	#2 (permalink)
Aryan Senior Member Join Date: Jan 2006 Location: New Delhi/ Shillong Posts: 18,274	Query Approved. __________________ ...in search of that perfect world - My Travel Blog :)

05-21-2010, 11:11 PM	#3 (permalink)
PRANAV D Jack the Ripper!!! Join Date: Feb 2010 Location: Mumbai Posts: 182	Is your bike completely stock? (without any additions like K&N filter wid bigger jets,FFE etc.) have u checked whether the carburettor is running a rich mixture? Is mileage the only issue or are u experiencing any other problems while riding? (as those problems might help in detecting mileage problem) What about engine oil is the bike drinking too much oil too? try monitoring the engine oil levels. Members here would be able to help you better if you elaborate on above points. __________________ RIDE IT LIKE YOU STOLE IT!!! Last edited by PRANAV D; 05-21-2010 at 11:17 PM. Reason: points added

05-22-2010, 12:56 AM	#4 (permalink)
jd666 Senior Member Join Date: Sep 2009 Location: Gurgaon/Faridabad Posts: 3,390	have the tappets been checked and adjusted? - have you replaced the spark plug and filter ( if not in a long time, then a good time to do it now ) - Are your tyres leaking air? - Are you getting your bike filled from the same petrol pump only?? ( if yes, please change pump and check ) __________________ My offerings to the gods of speed - - KTM Duke 200 - Yamaha RXZ 5 speed

05-22-2010, 10:21 AM	#5 (permalink)
xtremebiker Biking, approved by DAD Join Date: May 2010 Location: Indore, MP Posts: 19	Relating to above queries : 1. My bike is completely stock, no mods done. 2. Haven't been able to check the carburetor mixture, will check it soon. 3. Mileage is the only issue. 4. No, the bike isn't drinking oil at all (Using Motul 300v 15w50), level no problem. 5. Have duly replaced the spark plug and air filter. 6. No, bike tyres aren't leaking any air (Psi : F - 25, R - 40). 7. Yes I had been using the same petrol pump for the last 3 yrs (Indian Oil), no xtra premium only normal unleaded petrol. 8. The tappets have been checked and adjusted, since i got the whole head clean and also checked with the engine compression (mentioned in the service book i.e. to be checked at every 15000kms) Hope I resolved all ur queries genuinely, now plz help me out guyies. Thanx. __________________ There are two types of people in this world, people who ride Motorcycles and people who wish they could ride Motorcycles.

05-22-2010, 05:42 PM	#7 (permalink)
PRANAV D Jack the Ripper!!! Join Date: Feb 2010 Location: Mumbai Posts: 182	Well from my side i can only say check the carburettor mixture as that is the only thing remaining unchecked, rest all seems ok. If it is running too rich a mixture then you will notice- 1. Too much low end torque and thumpy/beaty engine sound especially at low rpms. 2. Electrode of the spark plug will be dark black in colour. Ideally it should be brown/light brown in colour which indicates optimum mixture. __________________ RIDE IT LIKE YOU STOLE IT!!! Last edited by PRANAV D; 05-22-2010 at 05:47 PM.

05-22-2010, 05:51 PM	#8 (permalink)
kurtrules Come as you are! Join Date: Jan 2009 Location: On the foothills Posts: 1,167	If the carb is tuned fine, then I believe it is a case of faulty valves and valve guides. Result: low mileage and black smoke from the exhaust Take it to the ASS and get it checked up. __________________ " I'd rather be hated for who I am, than loved for who I am not" - Kurt Cobain

05-23-2010, 04:11 PM	#9 (permalink)
ashwin208 member Join Date: May 2010 Location: Bangalore Posts: 468	NitinGirish is right, 40 psi is too much for the rear tyre. I have a 220 and the recomended pressure is 28F and 32R(with pillion). I however keep it at 30 and 34 so that the pressure is never too low even if its not been checked in a while. Xtremebiker - check the recommended pressure ( will be on the LH side swingarm or in your manual) and keep them 2 counts higher just in case. Might not solve your mileage issue but better not to run on over/under inflated tyres....

05-23-2010, 04:15 PM	#10 (permalink)
xtremebiker Biking, approved by DAD Join Date: May 2010 Location: Indore, MP Posts: 19	Ashwin man i had been upto this pressure from a long time but not faced any trouble. __________________ There are two types of people in this world, people who ride Motorcycles and people who wish they could ride Motorcycles.

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