Go Back   Team-BHP > BHP India > Motorbikes


Reply
 
Thread Tools Search this Thread
Old 18th January 2013, 07:49   #151
Senior - BHPian
 
aargee's Avatar
 
Join Date: Jan 2010
Location: KATN
Posts: 4,352
Thanked: 1,360 Times
Infractions: 0/1 (5)
Default Re: Honda CBR 250R : Answers to some commonly asked questions

Quote:
Originally Posted by sanjaybabu View Post
Firstly, I have been driving for the past 6 years
RIDING, I suppose

Quote:
Originally Posted by sanjaybabu View Post
and every time...during emergency braking conditions. Is this right?
Not sure, if I've understood things right, but there're lot & lot to post, it's not one simple scenario as the clutch can be engaged in 100 different occasion.

Quote:
Originally Posted by sanjaybabu View Post
Doesn't use of excessive engine braking damage the gearbox?
Define excess? 5K RPM downshift? 6K RPM downshift? 7K RPM downshift? 8K RPM downshift?

Quote:
Originally Posted by sanjaybabu View Post
I did try using engine braking as a normal method of braking but it sounds too harsh on the engine and gearbox. Can engine braking used at all times?
Like I said, quantify them because, 5K isn't excessive + excessive is an abstract term & to each his own.

Quote:
Originally Posted by sanjaybabu View Post
I also plan to change the engine oil. I have been using Honda's engine oil till now, planning on switching to Shell Ultra 10w-40, is this advisable?
10W-40 is THICKER grade of engine oil than HMSI supplied 10W30; From my EXPERIENCE of using 10W30, 300V 10W40 Factoryline & Shell Ultra 10W40 (again, there're two variants, pls be specific about the MRP, cover of the can etc to distinguish them). Have found Shell Ultra to be slightly superior than Motul 10W40 which is way ahead superior than HMSI 10W30 engine oil.

But again, if I were you, I wouldn't recommend switching the engine oil until the warranty expires; not that Shell Ultra, Mobil, Motul or any god damn thing might harm, but, something goes wrong, putting things back to place becomes mighty expensive.

Quote:
Originally Posted by sanjaybabu View Post
and what is the difference between a 10w-30 and 10w-40, i know its a change in viscosity levels but how does it actually affect the bike and which is the suitable grade for the CBR?
10W stands for 10 degree Celsius & Winter; 40 degree means, the engine oil's viscosity level is like 40C when the engine temperature is 100C. The viscosity level of the oil is very important because, higher the temperature, lower becomes the viscosity level & when the viscosity level is down, the oil looses its capacity to lube there by causing damage to the engine. Hope you were able to understand.

Pls go through this - http://www.upmpg.com/tech_articles/motoroil_viscosity/ & http://www.driverstechnology.co.uk/oils.htm
aargee is offline   Reply With Quote
Old 18th January 2013, 16:43   #152
Senior - BHPian
 
naveenroy's Avatar
 
Join Date: May 2009
Location: Now in Bangalore
Posts: 1,295
Thanked: 636 Times
Default Re: Honda CBR 250R : Answers to some commonly asked questions

Quote:
Originally Posted by aargee View Post
Way to go!!! Welcome to the world of DIY (and less headaches from ASC)

You'll need...
- 14mm socket & wrench or open ended wrench
- Long nose plier
- Thin but strong screwdriver (to push the pad holder from bottom)
- C-clamp (I don't have C-clamp either, I use large handle screw driver)
- Phillips head screw driver to fill brake oil in master cylinder, if required

These are all you'll need.
Ok, here goes. The brake pads are the right ones but once I fit in the Galfer pads, there is absolutely no space for the disc itself! So I took it to the service center (again there was engine noise) and asked the technician to check - he also tried and said an idea would be to remove one of the older pads - put in the Galfer pad and do the same for the other once the pads are a little worn. I didn't find this a great idea but have gone ahead and done this.

And update on the engine noise - got a shim changed - now the engine note is beautiful! Ah good to have the baby back in perfect shape.
naveenroy is offline   Reply With Quote
Old 19th January 2013, 18:25   #153
Newbie
 
Join Date: Jan 2013
Location: Chennai
Posts: 3
Thanked: Once
Default Re: Honda CBR 250R : Answers to some commonly asked questions

Thanks n_aditya and Akhilash95

Quote:
Originally Posted by aargee View Post
Quote:
RIDING, I suppose
Sorry i was vague. Riding, of course.


Quote:
Not sure, if I've understood things right, but there're lot & lot to post, it's not one simple scenario as the clutch can be engaged in 100 different occasion.
What i mean is, when i need to slow down the first thing i do is pull the clutch lever. I then brake and downshift to the appropriate speed. So after i have slowed down to the required speed and if i am in the right gear then only i release the clutch lever and accelerate. So i hold on to the clutch lever as long as i am slowing down , even after i have shifted to the required gear. Basically i was taught that when you brake you have to pull in the clutch lever. So is this right?




Quote:
Define excess? 5K RPM downshift? 6K RPM downshift? 7K RPM downshift? 8K RPM downshift?
Excess in the sense, too many times. If you engine brake too many times doesn't it damage the engine and gearbox? And it's mostly between 5k to 6k RPM downshifts. Only in rare cases does it exceed 6K RPM.


Quote:
10W-40 is THICKER grade of engine oil than HMSI supplied 10W30; From my EXPERIENCE of using 10W30, 300V 10W40 Factoryline & Shell Ultra 10W40 (again, there're two variants, pls be specific about the MRP, cover of the can etc to distinguish them). Have found Shell Ultra to be slightly superior than Motul 10W40 which is way ahead superior than HMSI 10W30 engine oil.

But again, if I were you, I wouldn't recommend switching the engine oil until the warranty expires; not that Shell Ultra, Mobil, Motul or any god damn thing might harm, but, something goes wrong, putting things back to place becomes mighty expensive.
My warranty is over so i want to change and see how it works out. It was the Shell Ultra silver colored can and it costs about Rs.800.

Quote:
10W stands for 10 degree Celsius & Winter; 40 degree means, the engine oil's viscosity level is like 40C when the engine temperature is 100C. The viscosity level of the oil is very important because, higher the temperature, lower becomes the viscosity level & when the viscosity level is down, the oil looses its capacity to lube there by causing damage to the engine. Hope you were able to understand.
Thanks a lot aargee, i understood quite well. I live in Chennai and i think you do too. So for our climatic conditions 10W-40 will be good i guess. Also is it necessary to change the oil filter when the oil change is done? What is the life of the oil filter supplied by Honda?
sanjaybabu is offline   Reply With Quote
Old 19th January 2013, 21:53   #154
Senior - BHPian
 
aargee's Avatar
 
Join Date: Jan 2010
Location: KATN
Posts: 4,352
Thanked: 1,360 Times
Infractions: 0/1 (5)
Default Re: Honda CBR 250R : Answers to some commonly asked questions

Quote:
Originally Posted by naveenroy View Post
once I fit in the Galfer pads, there is absolutely no space for the disc itself!
Reason being...the oil from master cylinder has to be bleeded & the pistons to be pushed back using C-Clamp (with the backside of screwdriver if experience)

Quote:
Originally Posted by naveenroy View Post
I didn't find this a great idea but have gone ahead and done this
Not a good idea :( Anyway, next time when I'm in Bangalore, we'll catch up & look into the Galfer. I'm 101% confident that it works. Did you order the Galfer from the UK site that I mentioned few pages back? They know clearly as what pads work & which don't. Hopefully your supplier hasn't given you unfit brake pads & hence the mention.

Sanjay - So did you complete 32000 Km? Reason to ask is because, it isn't 2 years since CBR 250R is launched for the warranty to expire.

About the brake thing, brake is not to be applied when clutch is engaged. That's not the right way to brake to keep the wheel & engine in sync.

Change the oil filter as per recommended intervals in the service manual. I usually change air & engine oil filters with every service as it costs way too less.

Since you're in Chennai, would you consider joining this group - https://www.facebook.com/groups/ChennaiCBR250R/
aargee is offline   (1) Thanks Reply With Quote
Old 19th January 2013, 23:23   #155
BHPian
 
Akhilash95's Avatar
 
Join Date: Dec 2012
Location: Bangalore
Posts: 141
Thanked: 61 Times
Default

Is it ok to upshift without pulling in the clutch ?(except 1-2 as there's neutral in-between resulting in a not so smooth).
Eg : running in 3rd gear @ 6k rpm
1.preload the shift lever
2. Hands off throttle for a moment
3.at the same time shift to 4th gear
4.continue throttling

Does it cause any problem overtime ?
Does it reduce the life of the transmission or engine ?
Akhilash95 is offline   Reply With Quote
Old 20th January 2013, 08:00   #156
Senior - BHPian
 
aargee's Avatar
 
Join Date: Jan 2010
Location: KATN
Posts: 4,352
Thanked: 1,360 Times
Infractions: 0/1 (5)
Default Re: Honda CBR 250R : Answers to some commonly asked questions

Quote:
Originally Posted by Akhilash95 View Post
Is it ok to upshift without pulling in the clutch ?
Perfectly yes to destruct the motorcycle

On a serious note, I tried once & I couldn't shift; thought I'll break the gearbox & then didn't attempt it.

Quote:
Originally Posted by Akhilash95 View Post
Does it cause any problem overtime ?
Does it reduce the life of the transmission or engine ?
Needless to say, otherwise clutch would've not even been a part of automobiles...universally isn't it?

Last edited by aargee : 20th January 2013 at 08:02.
aargee is offline   (1) Thanks Reply With Quote
Old 20th January 2013, 17:35   #157
Distinguished - BHPian
 
Sheel's Avatar
 
Join Date: Jul 2006
Location: Purnea(Bihar)
Posts: 4,643
Thanked: 3,839 Times
Default Re: Honda CBR 250R : Answers to some commonly asked questions

Quote:
Originally Posted by Akhilash95 View Post
Does it cause any problem overtime ?
Does it reduce the life of the transmission or engine ?
Rest assured if done correctly, it doesn't. There is no evidence that it does if done correctly. You may scour the internet for more dope on it.

Few friends do clutch-less downshifts as well & frankly, I haven't tried doesn't mean it isn't possible.

One of them is a member here pulsurge. He has done close to 30K on his 250R & the other's CBR is close to 50K.

This isn't limited to the 250R BTW as you know.

You have got the basics right & you won't master it in a attempt or two. And no, your engine won't get into trouble if you are doing it the way you have mentioned.

Thanks :-)
Sheel is offline   (2) Thanks Reply With Quote
Old 20th January 2013, 18:58   #158
Senior - BHPian
 
aargee's Avatar
 
Join Date: Jan 2010
Location: KATN
Posts: 4,352
Thanked: 1,360 Times
Infractions: 0/1 (5)
Default Re: Honda CBR 250R : Answers to some commonly asked questions

Quote:
Originally Posted by Sheel View Post
Few friends do clutch-less downshifts as well & frankly, I haven't tried doesn't mean it isn't possible
Interesting; I was under the impression that it's not possible to shift the gear without clutch, like cars. Let me talk to Pulsurge & find out or try out tomorrow.
aargee is offline   Reply With Quote
Old 21st January 2013, 08:30   #159
Senior - BHPian
 
aargee's Avatar
 
Join Date: Jan 2010
Location: KATN
Posts: 4,352
Thanked: 1,360 Times
Infractions: 0/1 (5)
Default Re: Honda CBR 250R : Answers to some commonly asked questions

Tried to shift without clutch this morning & I was amazed that it was quite possible; something that I thought isn't possible did happen. Now to the details...

- If you rev the engine, it becomes extremely hard to shift the gears, be it upshift or downshift
- Something in the range of 3-4K RPM is quite easy; but again, not consistent; what I mean is, the gear shifts are sometimes feather touch, sometimes with a little loud clank; sometimes have to be pressed little harder, sometimes not
- There's no definite pattern relating the RPM, speed with feather touch gear shift. I'd this in my Rx where I can be sure that at certain RPM's the gear WILL be smooth shift, but that's not the case here or may be I'm still learning with CBR
aargee is offline   Reply With Quote
Old 21st January 2013, 12:46   #160
Distinguished - BHPian
 
Sheel's Avatar
 
Join Date: Jul 2006
Location: Purnea(Bihar)
Posts: 4,643
Thanked: 3,839 Times
Default Re: Honda CBR 250R : Answers to some commonly asked questions

Quote:
1.preload the shift lever
2. Hands off throttle for a moment
3.at the same time shift to 4th gear
4.continue throttling
Quote:
Originally Posted by aargee View Post
- If you rev the engine, it becomes extremely hard to shift the gears, be it upshift or downshift
- Something in the range of 3-4K RPM is quite easy; but again, not consistent; what I mean is, the gear shifts are sometimes feather touch, sometimes with a little loud clank; sometimes have to be pressed little harder, sometimes not
- There's no definite pattern relating the RPM, speed with feather touch gear shift. I'd this in my Rx where I can be sure that at certain RPM's the gear WILL be smooth shift, but that's not the case here or may be I'm still learning with CBR
No clanks please. Use clutch then.

We all shift just shy of the red-line & it is all smooth.

It shall get bad, IF you aren't riding hard, that is riding in commuter mode. You have to keep the throttle wide open after shifting. This is what I have experienced.

Scour the net, watch You Tube videos & practice. Nothing like it.

Thanks
Sheel is offline   (1) Thanks Reply With Quote
Old 21st January 2013, 20:36   #161
Distinguished - BHPian
 
Join Date: Jul 2009
Location: Kolkata
Posts: 3,285
Thanked: 1,660 Times
Default Re: Honda CBR 250R : Answers to some commonly asked questions

Quote:
Originally Posted by Akhilash95 View Post
Is it ok to upshift without pulling in the clutch ? .....
Does it cause any problem overtime ?
Does it reduce the life of the transmission or engine ?
Quote:
Originally Posted by aargee View Post
.......
otherwise clutch would've not even been a part of automobiles...universally isn't it?
http://www.team-bhp.com/forum/techni...ml#post2354649 (Emergency driving - Without clutch)

I think lots of us have done clutchless gearchanges in an emergengy (clutch cable failure).

Regards
Sutripta
Sutripta is offline   Reply With Quote
Old 21st January 2013, 20:46   #162
Senior - BHPian
 
naveenroy's Avatar
 
Join Date: May 2009
Location: Now in Bangalore
Posts: 1,295
Thanked: 636 Times
Default Re: Honda CBR 250R : Answers to some commonly asked questions

Quote:
Originally Posted by aargee View Post
Reason being...the oil from master cylinder has to be bleeded & the pistons to be pushed back using C-Clamp (with the backside of screwdriver if experience)
Yes, guess that was it. And he kept insisting that the silencer needs to be removed for fitting the back pads. Don't think that is required.

Quote:
Originally Posted by aargee View Post
Not a good idea :( Anyway, next time when I'm in Bangalore, we'll catch up & look into the Galfer. I'm 101% confident that it works. Did you order the Galfer from the UK site that I mentioned few pages back? They know clearly as what pads work & which don't. Hopefully your supplier hasn't given you unfit brake pads & hence the mention.
No, I am certain it is nothing wrong with the pads - they are the right ones also - confirmed from the seller before placing order and the site you had mentioned.
naveenroy is offline   Reply With Quote
Old 22nd January 2013, 08:45   #163
Senior - BHPian
 
aargee's Avatar
 
Join Date: Jan 2010
Location: KATN
Posts: 4,352
Thanked: 1,360 Times
Infractions: 0/1 (5)
Default Re: Honda CBR 250R : Answers to some commonly asked questions

Quote:
Originally Posted by Sutripta View Post
I think lots of us have done clutchless gearchanges in an emergengy (clutch cable failure)
Have done several times on my old Rx when the cables broke, but I don't like to ride without clutch, not that because, I cannot, but, I feel like hurting the poor vehicle.

Anyway, last evening, I tried a few times shifting gears with highrevs; the result were mixed again, sometimes I was able to shift smoothly like feather touch, sometimes not, had to try multiple times. May be I need to press little harder.

Quote:
Originally Posted by naveenroy View Post
Yes, guess that was it...that is required
Crazy mechanic; try to change your ASC. Absolutely not required.

Quote:
Originally Posted by naveenroy View Post
No, I am certain it is nothing wrong...placing order and the site you had mentioned.
Can you post a pic pls? I'm sure it's a direct fit on Nissin or may be we should talk as what went wrong & where. I'm 100% sure it's a direct fit.
aargee is offline   Reply With Quote
Old 24th January 2013, 15:33   #164
BHPian
 
dreamseller's Avatar
 
Join Date: Nov 2005
Location: Mohali/SGP
Posts: 363
Thanked: 310 Times
Default Re: Honda CBR 250R : Answers to some commonly asked questions

My two cents: Please don't mix a two-wheeler gearbox with a 4-wheeler's. Motorcycles have a sequential gearbox, i.e., you HAVE to go through the sequence of gears unlike cars where you can jump gears. Hence, one can very safely make clutchless shifts. The trick is to keep the RPM at the right level in order to use the pre-loaded lever to slot into the next higher gear. Clutchless downshifts are possible too, although upshifts are easier to master.

As Sheel has pointed out, youtube is a good place to learn.

Last edited by dreamseller : 24th January 2013 at 15:36.
dreamseller is offline   Reply With Quote
Old 24th January 2013, 21:57   #165
Distinguished - BHPian
 
Join Date: Jul 2009
Location: Kolkata
Posts: 3,285
Thanked: 1,660 Times
Default Re: Honda CBR 250R : Answers to some commonly asked questions

Quote:
Originally Posted by dreamseller View Post
My two cents: Please don't mix a two-wheeler gearbox with a 4-wheeler's. Motorcycles have a sequential gearbox, i.e., you HAVE to go through the sequence of gears unlike cars where you can jump gears. Hence, one can very safely make clutchless shifts. The trick is to keep the RPM at the right level in order to use the pre-loaded lever to slot into the next higher gear. Clutchless downshifts are possible too, although upshifts are easier to master.
Actually it is even easier to make clutchless gearchanges, esp. downshifts, in a car compared to a bike. The sequential shift pattern in a motorcycle is not relevant in this regard, the lack of a well defined neutral between every pair of gears is. Cars have a well defined neutral position.

Regards
Sutripta

P.S. Ever wondered why in a DSG, downshifts take longer than upshifts?

Anyway before it becomes a controversy, here's my take on clutchless gearchanges:
Can it be done - Yes
Will it damage the gearbox - If perfectly done, IMHO, no.
Should one do it regularly - No. Because doing it perfectly 100% of the time is very difficult. And when you don't get it right, you are damaging/ causing extra wear and tear on the gearbox.

Last edited by Sutripta : 24th January 2013 at 22:07.
Sutripta is offline   (1) Thanks Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Honda gives CBR 150R, CBR 250R new colours, decals for 2015 ashwin.terminat Motorbikes 23 31st October 2015 22:32
Honda recalls CBR 150R & CBR 250R for defective starter relay Added_flavor Motorbikes 0 15th August 2015 11:42
2014 Honda CBR 250R shares design with the recently unveiled CBR 300R JayPrashanth Motorbikes 6 25th October 2013 17:21
CBR 250R or CBR 600F2 sharad_kmc Superbikes & Imports 8 14th March 2013 21:04


All times are GMT +5.5. The time now is 01:59.

Copyright 2000 - 2016, Team-BHP.com
Proudly powered by E2E Networks