ravisghosh

I got Honda CB Dazzler (modified unicorn) few months back and ever since has been running to the service center for one or other problem.

Before first service, the bike used to give a mileage of 50+ kmpl.
After first service, the mileage dropped to 35-40 kmpl! This led to me running to service center frequently to get it fixed. All they would do is do some tunning and the issue won't be fixed.

Finally, they did a mileage test with 100 ml petrol in the can. On the test, the mileage turned out to be 60 kmpl! This high mileage was absurd but I was speechless. It was me who was riding so the question of difference in mileage due to riding style did not arise.

In nutshell;
On road mileage is 40 kmpl.
Test milelage (with 100 ml can) is 60 kmpl.

How can this difference be explained? If I go to the service center, they would say the test is showing the mileage correct and there is no issue in the bike. I'm really confused.

Please help.

sunilg

Query approved.

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princesirohi

what is your method of checking on road mileage.........???

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ARNandal

@ravi: The mileage tests you have done doesnt give exact figures.. itz just a calculation.

at what speed or rpm range are you getting your mileage,

b/w.. as PRINCE asks how do you check the mileage? since 20kmpl difference is possible only if the clutch plates are burned... and that can be observed only at higher rpms.
How did you perform the running-in process

i suppose you are not depending on fuel indication on the dial for calculations...

Make your tank empty, that is ride till it stops, (there can be some fuel left, and that is the unusable part) and add 1L, ride and test. or else fill your tank 1L above reserve and check. (do alwayz keep some fuel with you as spare )

If the same persists...

Give your carburetor for cleaning, ask them to check the mainjet and the clutch

If the mainjet is tampered it can sent more fuel than required at higher rpms (but still it wont give 20kmpl difference)
How many service and kms did you cover, and tell us how you change gears, hope you dont maintain riding a gear less than the top gear
and ask him to check whether you are using the same carburetor your bike should be using.
these all are rare chances as your bike is new...

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Prabhakar150

Mileage test on 100 ml petrol will not give exact mileage figures. It differ a lot from everyday start, stop heavy traffic or high speed ripping and riding. Explain them about that.

The carburetor needs to be tuned properly. Service center people always mess up with this tuning..

Prabhakar150

If you want to know the exact mileage then empty the tank. Fill atleast 3 litres of petrol and ride it till it comes to an end. This will give the most accurate figures.

If your bike is still in run-in process then i advice you to wait until it crosses 2000 kms, to worry about mileage. Because the mileage will improve after proper running-in .

sandeepcf

First of all check your petrol bunk/filling station if they are filling exact volume of petrol.
Amateur mileage testing.
make your own mileage testing can, because when the service center people use their can & if there is any error in its volume reading, the mileage error also magnifies by 10 fold. because they multiply 100ml by 10 right.
Take a pet bottle(your fav soft drink), buy 1 meter of petrol pipe, make a hole in the cap and insert the pipe real tight, make a small hole at the bottom with a pin, use a plaster or cellophane tape to cover the hole.
Fill it with 100ml of petrol.
turn off the fuel, remove the fuel pipe, ride the bike until it gasps, use choke to burn every single drop of petrol in the carburetor bowl. now connect the pipe of your bottle, invert the bottle, remove the plaster to let air in, wait until the petrol flows into the carb, ride. you need a friend who can hold the bottle.
1. Highway testing(constant throttle at midrange or economy range)
2. City traffic conditions.
before testing, make sure the correct tyre pressure is there, make sure the airfilter is clean, chain tension is checked and well lubricated, engine oil is good(svc center guys sometimes don't change the engine oil but gives you bill for oil change)
Log your recordings, test different configurations of air/fuel screw turnings etc, come to a conclusion.
I get 63 on highways and 51 in city conditions on my unicorn

eliksir

sorry for being OT but thats one crazy method

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ravisghosh

Thanks a ton guys for the replies. Here is the method I used for testing mileage:

1. Reset the trip meter to 0 when the bike goes into reserve.
2. Fill petrol varying from 1 to 4 liters (I've bought petrol in bottles to overcome the suspicion that bunk guys dispense less petrol).
3. Run till the bike goes into reserve again.
4. Note the trip meter and calculate mileage.
5. I have repeated the process at least 20 times and got to the same average.

Is emptying the tank necessary or reserve-to-reserve serves the same purpose.

Riding Condition: City riding.
Current Odometer reading: 2600 km.

@ARNandal - Thanks a lot for the insight into what can cause the dip in mileage. However, if those things are causing dip in mileage, then I should get same low mileage while testing with the can at service center.

The confusion is how service center test gave 60 kmpl and my road test gives 40 kmpl consistently. In both, the road conditions were same, city riding with lot of traffic.

The only reason I can think of is that their can is tampered.

Are you guys aware of any mechanic/Honda service center who can assess the problem properly.

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ARNandal

Reserve to reserve will serve the purpose, but would be approximate but definitely wouldnt give more 800ml of variation.

Clear all these questions..

> Have you done any modification on your bike?
> how did you perform the running-in process, did you follow the riding instructions like speed limit & rpm limit on each gears....?
Improper running-in can affect mileage.
> most common speed and rpm you maintain during your daily rides?
> Did you change the engine oil after the first 500kms run?
> Which Engine oil are you using? did you fill it up or the service centre?
> Does your engine overheat
> Does your Engine knock, or do u feel less power or acceleration?
> do u feel any hiccups or sounds or uneven or not smooth ride, when accelerating.
> place your vehicle in centre stand rotate both the wheels and check whether they move freely or not
> do u feel your bike accelerating by sound and not moving.
> do you experience hard gear shifting?
> Did you see the mechanic removing the carburetor, or did he just did tuning using the screw driver
> is this the first time you are riding a bike?

2600km on the odo is high time your bike should be giving good mileage.
Tell us with on all the above queries and we will help you with a way to get the issue sorted.

__________________
Presence of MIND and self CONFIDENCE is the primary aspect You need to be on road, not what brand your riding gears are.
If you lack these two then DONT

Feel the pleasure of Ultimate Biking
__________________________________________

. . . alwayzaLive . . .