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**Yashas Rl** · 11-11-2013, 10:26 PM

Re: Stuck at 8000rpm on 6th gear on Yamaha R15 v2

Originally posted by incipient View Post

What bike are you riding man?

Of course the same as most of the members in here do! An R15 V2.0. Why whats wrong in the information I provided? Correct me if I am wrong! Its my practical knowledge!

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**abhimanyu31** · 11-11-2013, 10:32 PM

Re: Stuck at 8000rpm on 6th gear on Yamaha R15 v2

Originally posted by Yashas Rl View Post

Of course the same as most of the members in here do! An R15 V2.0. Why whats wrong in the information I provided? Correct me if I am wrong! Its my practical knowledge!

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The reason he is asking is due to the figures you are claiming. It is not possible for the R15 to do 150 kmph at 7,900 rpm. It's not possible as it's against the laws of physics.

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**Yashas Rl** · 11-11-2013, 10:41 PM

Re: Stuck at 8000rpm on 6th gear on Yamaha R15 v2

Originally posted by abhimanyu31 View Post

The reason he is asking is due to the figures you are claiming. It is not possible for the R15 to do 150 kmph at 7,900 rpm. It's not possible as it's against the laws of physics.

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Maybe! But I just told what I saw on my speedo! But wait was it 7.9 or 8.9? :what:
I have forgotten as it was like a few months ago I did that speed! I am sorry people! Confused with how much the tachometer showed exactly! But surely I did 150kmph!

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**Vikas Rao** · 11-11-2013, 11:12 PM

Re: Stuck at 8000rpm on 6th gear on Yamaha R15 v2

Originally posted by abhimanyu31 View Post

Get the compression checked. Also get the valve clearance checked. It seems unlikely that the clutch is slipping only in the 6th gear at the top end of the rev range.

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well the 6th gear does need a lot of torque to turn! Can you suggest me a good local mechanic where I can get this done? I stay in bellandur

**aditya_YZF-R15** · 11-11-2013, 11:53 PM

Re: Stuck at 8000rpm on 6th gear on Yamaha R15 v2

Originally posted by Yashas Rl View Post

Until ECU is replaced with a custom one it cannot cross 8k rpm. Mine did 150kmph at 7.9k rpm in 6th gear and did not go beyond it! And lastly, a stock ECU which our bikes come with cannot be remapped!

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:O

mine does something like 135-137 kmph at around 9.5k on the odo..how do you get to 150kmph at just 7.9 k ?

guess it's again maybe one of those cases where people's speedometers behave differently as one nears their bikes' maximum capabilities, whereas of course the true speed (that we never really know) at a given RPM and at a given gear is the same for all.

----consecutive posts auto-merged-----
[MENTION=61982]Vikas Rao[/MENTION] - does your 6th gear still get stuck at 8000 even if you take all (or most of) the lower gears all the way to 10000 before shifting up ?

**abhimanyu31** · 11-12-2013, 12:12 AM

Re: Stuck at 8000rpm on 6th gear on Yamaha R15 v2

Originally posted by Vikas Rao View Post

well the 6th gear does need a lot of torque to turn! Can you suggest me a good local mechanic where I can get this done? I stay in bellandur

On the contrary; post 8,000 rpm torque drops sharply (the torque for this bike peaks at 7,500 rpm). The 6th gear is kept spinning by the power made by the engine after 9,000 rpm. However, since there is very little torque available after 9,000 rpm, the bike susceptible to outside forces like wind resistance which can be more than the available torque, thus speed drops till it reaches an rpm where the torque is able to counteract the outside forces.

Sorry, can't help you with the local mechanic part. I live in Mumbai. However, it's highly doubtful that a local mechanic will have a compression gauge to measure the compression. You will be better off going to the SVC to get it checked.

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**Princepaji** · 11-12-2013, 12:14 AM

Re: Stuck at 8000rpm on 6th gear on Yamaha R15 v2

Originally posted by aditya_YZF-R15 View Post

:O

mine does something like 135-137 kmph at around 9.5k on the odo..how do you get to 150kmph at just 7.9 k ?

guess it's again maybe one of those cases where people's speedometers behave differently as one nears their bikes' maximum capabilities, whereas of course the true speed (that we never really know) at a given RPM and at a given gear is the same for all.

----consecutive posts auto-merged-----
@Vikas Rao - does your 6th gear still get stuck at 8000 even if you take all (or most of) the lower gears all the way to 10000 before shifting up ?

Even i was assuming same but i got my top speed i.e 145km/h
if you want to cross 140.....you need to have proper tyre pressure.....Chain should be properly lubed.......dont carry any backpack.....and change the 5th gear when you are at 125 km/hr.....you will definitely cross 140.....and yes.....you need to crouch all the time when u want to touch the top speed......

Still if you dont get then remove the Tyre Hugger....

**incipient** · 11-12-2013, 01:20 AM

Re: Yamaha YZF-R15 version 2.0

Originally posted by Anuj_Gupta

Suzuki going to enter 150cc sports bike regime...
My twin Girlfriends- > 200cc sized 23.5 bump of raw power and 150cc blue edition fairing style v2..!!

Cool, now you can have triple Girlfriends and become the envy of every moron on the street!

**Vikas Rao** · 11-12-2013, 01:22 AM

Re: Stuck at 8000rpm on 6th gear on Yamaha R15 v2

Originally posted by aditya_YZF-R15 View Post

:O

@Vikas Rao - does your 6th gear still get stuck at 8000 even if you take all (or most of) the lower gears all the way to 10000 before shifting up ?

hmm haven't tried that. My friend asked me not to redline on the lower gears and to only do it on the 5th.

**incipient** · 11-12-2013, 01:56 AM

Re: Stuck at 8000rpm on 6th gear on Yamaha R15 v2

Originally posted by Vikas Rao View Post

hmm haven't tried that. My friend asked me not to redline on the lower gears and to only do it on the 5th.

You can ask one your friends who you say regularly does higher speeds on a R15 to ride your bike. If he is able to do it then it must have something to do with your technique and not the bike.
BTW, how much do you weight?

**Vikas Rao** · 11-12-2013, 02:02 AM

Re: Stuck at 8000rpm on 6th gear on Yamaha R15 v2

Originally posted by incipient View Post

You can ask one your friends who you say regularly do higher speeds on a R15 to ride your bike. If he is able to do it then it must have something to do with your technique and not the bike.
BTW, how much do you weight?

Well my friend just started riding.. But I'll just exchange bikes with him next time... I weigh about 75.. I have a friend who is about 60 and hit 144.. Another 110 and has hit 148.. Another on doubles with luggage hit 140 but he has Joel's air filter though... And he did ride my bike and he felt the same

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**incipient** · 11-12-2013, 02:05 AM

Re: Stuck at 8000rpm on 6th gear on Yamaha R15 v2

Originally posted by Vikas Rao View Post

I weigh about 75.. I have a friend who is about 60 and hit 144..

15kg makes a big difference on a lower cc bike like the R15. Your top speed on the same bike will be quite a bit lower than him.
Still, you should be able to do 135kmph or above on your bike if everything is working well.

**Vikas Rao** · 11-12-2013, 02:07 AM

Re: Stuck at 8000rpm on 6th gear on Yamaha R15 v2

Originally posted by incipient View Post

15kg makes a big difference in top speed on a lower cc bike like the R15.

Yes it does.. But that's not the only example.. I have given you two more instances.. BTW I have removed the tire hugger..

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**aditya_YZF-R15** · 11-12-2013, 02:42 AM

Re: Stuck at 8000rpm on 6th gear on Yamaha R15 v2

Originally posted by Vikas Rao View Post

hmm haven't tried that. My friend asked me not to redline on the lower gears and to only do it on the 5th.

well, firstly, it's not really redlining, since R15 has a ECU enabled rev limiter which kicks in at 10400-500 (beyond which is the red line) and so you never go so far into the red area anyway...

occasionally, particularly for testing purposes, there's no harm at all in taking to 10000 in low gears once in a while...if nothing else, one gets to know more about his bike doing that a few times...

actually i dont think there should be any harm to the bike on a regular revving to 10000 at low gears, except maybe the mileage going down (in my case whenever i did that a few times in a test ride, the mileage went down quite a bit, so i think it was due to that)...anyway, i dont do it either anymore now that i have checked it out before a few times...engine feels very harsh at high RPMs low gears so one doesnt even tend/want to do it often anyway.

of course, dont rev it so hard on a cold engine, in that case it'd be harmful to the engine in the long run i suppose...

**Vikas Rao** · 11-12-2013, 12:55 PM

Re: Stuck at 8000rpm on 6th gear on Yamaha R15 v2

Originally posted by aditya_YZF-R15 View Post

well, firstly, it's not really redlining, since R15 has a ECU enabled rev limiter which kicks in at 10400-500 (beyond which is the red line) and so you never go so far into the red area anyway...

occasionally, particularly for testing purposes, there's no harm at all in taking to 10000 in low gears once in a while...if nothing else, one gets to know more about his bike doing that a few times...

actually i dont think there should be any harm to the bike on a regular revving to 10000 at low gears, except maybe the mileage going down (in my case whenever i did that a few times in a test ride, the mileage went down quite a bit, so i think it was due to that)...anyway, i dont do it either anymore now that i have checked it out before a few times...engine feels very harsh at high RPMs low gears so one doesnt even tend/want to do it often anyway.

of course, dont rev it so hard on a cold engine, in that case it'd be harmful to the engine in the long run i suppose...

Well I'll have to wait till this weekend then.. Will try shifting at only 10k rpm. So the rev still drops on 6th back to 8000? what should I conclude?
And If someone with more experience can just ride my bike and get a feel for the problem that would be great.

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