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Thread: Performance vs KMpl

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    Rookie saurabh.agrawal's Avatar
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    Default Performance vs KMpl

    Hi, this is my first thread and I have a noob question for you guys.
    I own a Honda CBF Stunner 125, and I've done less than 3000 kms on it. While getting my bike serviced a couple of months back, I complained that the bike was only giving me ~40 kmpl. After that, it increased by 10-15%. Recently, one of my friends said that i was over-revving the engine and that was the probably the reason for low milage. I took his advice and started shifting up earlier than I used to. This bike doesn't have an rpm meter so I cant give the exact numbers. The milage further increased by 10% to ~50 kmpl.
    Now, though I'm happy with the milage, I'm not quite satisfied with the bikes "power"(not sure if thats the correct tech term). What I mean is that in the top gear just when the speedometer needle crosses 50 kmph, the engine starts vibrating like its under a lot of stress. I'm quite sure theres something wrong. I shouldn't have to over-rev the engine just to cross 50 kmph, right? Even mopeds like Activa go faster than that!
    Is it possible that the service center guys did some kind of tuning to increase the milage which adversely affected the performance of the bike?

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    ya ur right.........i have also experienced that...but you should keep in mind that itz a 125cc...so donot expect a rocket power....weell jokes apart..i don't know but i have experienced that in all honda bykes.....

    i rode honda shine before..,...if u see the shine and cbf stunner has the same specifications.....

    when crossing 60 it vibrates so much as if it doesn't want to go beyond that.....while riding at alower speeds it was comfortable.......

    but this is not the case with hh and bajaj...they easily cross 60 without vibrations......

    even my late 115cc calliber go beyond 60 withouit any hesitations.....at 80...it starts to vibrate.....
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    Quote Originally Posted by ceasar View Post
    ya ur right.........i have also experienced that...but you should keep in mind that itz a 125cc...so donot expect a rocket power....weell jokes apart..i don't know but i have experienced that in all honda bykes.....
    I understand that its just a 125cc bike. But its really embarassing when my bike finds it difficult to keep up with a girl on a Activa! Doesn't it have a 100cc Honda engine too?

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    I rode shine. i did till 90 on it with lil vibes.
    So stunner might be equal if the specs are same !!
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    Saurabh you can't marry both the sisters you have to settle with one of
    them either mileage one or a power one ..
    "Engine tuning is not an exact science, but with some practice and patience you'll get comfortable with your skill and be able tune for any conditions mother nature throws at you"


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    Quote Originally Posted by saurabh.agrawal View Post
    Hi, this is my first thread and I have a noob question for you guys.
    I own a Honda CBF Stunner 125, and I've done less than 3000 kms on it. While getting my bike serviced a couple of months back, I complained that the bike was only giving me ~40 kmpl. After that, it increased by 10-15%. Recently, one of my friends said that i was over-revving the engine and that was the probably the reason for low milage. I took his advice and started shifting up earlier than I used to. This bike doesn't have an rpm meter so I cant give the exact numbers. The milage further increased by 10% to ~50 kmpl.
    Now, though I'm happy with the milage, I'm not quite satisfied with the bikes "power"(not sure if thats the correct tech term). What I mean is that in the top gear just when the speedometer needle crosses 50 kmph, the engine starts vibrating like its under a lot of stress. I'm quite sure theres something wrong. I shouldn't have to over-rev the engine just to cross 50 kmph, right? Even mopeds like Activa go faster than that!
    Is it possible that the service center guys did some kind of tuning to increase the milage which adversely affected the performance of the bike?
    Hey saurabh,

    I wouldn't be able to say anything specifically w.r.t the Honda Stunner but then the symptom that you are talking of i.e. that of over-revving relative to earlier happens with a leaner mixture if it is the carburettor setting that is at fault. Also this could be a result of worn out clutch plates. But then the possibility of a faulty carburettor setting looks more likely as you had mentioned the mileage thing to the service center guys & like you pointed out they might have fiddled with the settings.

    I can say this from personal experience when I did rejetting in my bike, which used to feel stressed even at speeds close to 50-60kmph with a lean setting but the throttle response & even the feel improved a lot with a richer (relative to the stock) setting. The reason I had to rejet my bike was because of a free flow exhaust that I had installed on the bike.

    And hey, there can a whole lot of other reasons that can be responsible for this, but then according to me, these two are the most likely of them all.

    Take care.

    Happy & safe riding,
    Prakhar
    Last edited by blackfire_9; 04-26-2009 at 01:51 PM.

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    Thanks for the response guys. I just wanted to know if my bikes behaviour was normal or not. I'll make sure I point this out the next time I get my bike serviced. I really don't mind 45kmpl if my bike can atleast comfortably run @60kmph

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    Quote Originally Posted by saurabh.agrawal View Post
    Thanks for the response guys. I just wanted to know if my bikes behaviour was normal or not. I'll make sure I point this out the next time I get my bike serviced. I really don't mind 45kmpl if my bike can atleast comfortably run @60kmph
    Hey saurabh,

    It's a pleasure helping out fellow riders, & hey do update the thread with whatever develpments happen.

    Take care.

    Happy & safe riding,
    Prakhar

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    Quote Originally Posted by saurabh.agrawal View Post
    I understand that its just a 125cc bike. But its really embarassing when my bike finds it difficult to keep up with a girl on a Activa! Doesn't it have a 100cc Honda engine too?
    an ot altogether: you can just not keep pace witha girl, no matter how potential your steed might be......
    Its not about the BHP or the CC, its about one common religion called Biking!!!

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