Re: New Honda CBR250R launched in Indonesia

Is it ? Honestly, for me what I felt was that, handling the bike in the city traffic meant doing the gear dance all too often than i would like to mention. It gives a feeling like the current gear is too tall for the speed and you shift down and now suddenly you are short geared and need to shift back up again. In lean traffic it is quite alright.
Then again a bit of getting used to is needed, now i am not that much bothered about it and doesn't nag too much , but still it is always in my mind and i wish that it would have been a bit more matured (:-D) in the lower gears.

And this seems to be getting more strange, but for highway cruising(my speeds are like a comfortable 90-110kmph) I feel it is just right at home, not much load and glides smoothly.


It is very interesting to find that you have the exact opposite feeling with the stock setup, I wonder why..!!

Cheers
Ride Safe
Krishna

Re: New Honda CBR250R launched in Indonesia

now this is what i am looking for...


i do agree with [MENTION=33779]icemang[/MENTION] .. yeah the bike does just fine with 6200rpm at 100kmph but then it will be far more smoother if it does at 5500-5700 rpm...
the speedo will still show 100kmph at 6200 rpm..

diffrence is this time you will be doing actaul ton instead of sitting at 92-93 and showing 100kmph
and yes the 1st gear is too short. i find it rather clunky and unusable in heavy traffic..

Re: New Honda CBR250R launched in Indonesia

Ok, i guess I can only comment on it being better once i ride the bike with the 15T setup.

Cheers
Ride Safe
Krishna

Re: New Honda CBR250R launched in Indonesia

trust me.. you'd enjoy it to the core... as most of your riding is on highway and you prefer riding at ease.. no hurry .. 15 T will be a boon for you.. and even in city you'd like it.
power loss is minimal..

with 13T it will be quicker but losses as far more significant..

Re: New Honda CBR250R launched in Indonesia

Meh, 13T is not even in consideration, I do not want a super quick bike. Just a calm tourer friendly setup is good. And the occasional high rev action I guess stock is good for now.
When it is time for a chain sprocket replacement, the 15T will be surely in consideration.

Cheers
Ride Safe
Krishna

Re: Honda CBR 250R

Guys which 15 teeth front sprocket fits CBR250R, I would change mine right away.

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Re: New Honda CBR250R launched in Indonesia

Hello sir,

would request you to do an observation if over-gearing your CBR 250R from 14 - 15T front sprocket results in increase of chain and sprockets life in comparison to stock set up. On my FZ this was an unexpected gain i witnessed once i shifted to 15T from stock 14 - 40 config. Earlier, my bike had consumed 2 sets of chain and sprockets under 13 - 14,000 kms even after careful cleaning and lubrication at specified intervals, most of riding at highways and speeds roughly 85 - 90 kmph. Post 15T sprocket mod, the chain adjustment has barely moved 1 notch even after completing 15,000+ kms and the sprockets seem to have lesser wear in comparison to earlier stock config. I believe, under the current circumstances, this set will surpass 30,000 kms easily.



Pic 1: Life of chain after 15,000 kms using 15 - 40 sprocket config instead of stock 14 - 40. Pardon the muck!! All thanks to using SAE 140 gear oil for chain lubrication..

On further digging i was surprised to find that the same has been witnessed by other riders even on KB100 to other 100 - 150CCs whoever attempted over-gearing their respective bikes..

I feel most likely due to torque spread on the final drive to the rear wheel with 15T, reduces the overall stress on the chain and sprocket components: exponentially increasing the life of the same. If you witness this effect on the current config i guess it will confirm my theory.

Cheers,

Re: New Honda CBR250R launched in Indonesia

Don't kill me for the question but does turning the stock front sprocket from 14T to 15T increase accelaration or topend speed. What would be the effect on fe. I know this topic has been discussed earlier, its just that I am too lazy to search the thread . And can anyone suggest were can I source a 15T sprocket for CBR and for how much.

Re: New Honda CBR250R launched in Indonesia

16-19k is time for chainset to last... looking forward for the mod job..

buddy you would need one which will fit with .520 chain pitch and it should also work with the shaft size of the cbr.
as far as i know locally nothing available. if any of your friends are travelling from states to india anytime.
you can order cpl of them from amazon and other few websites for as low as 18$..


yes the torque will be widespread but another strong reason for the chain to last longer is the chain slack reduces with the 15T as it will be in bigger size than the 14T hence you'd see the chain reaching the replacement mark later than stock setup. also the chain goes through less stress due to lesser jerks and eenly spread torque...


if you are hypermiling and keep the revs 6k and around the FE will increase as distance travelled is more in same rotations however
the speedo and trips will be still working as per the stock configuration hence even if you travel say 120km with better FE the
meter will still show 110 or lesser and you'd still think the FE is more or less the same.

theoritically the top end will increase by 7% but then cbr is already geared too tall and does not budge beyond 8700-8800 rpm in 6th gear
with speedo a little above 150ish however the real speed will be close to 140ish (gps/speed gun). if you can manage to pull the bike 8700rpm with 15T
be rest assured that you are doing actual (real) 150+..

to fix this you can get speedo healer/fixed (multiple brands ) 10$- 80$ again from states..


acceleration will reduce.. but then marginally which you find a feasible sacrifice over the comfort of revised short gear ratios. comfortable for city.


so all in all : now the bike does 100kmph at 6200 rpm but actual speed is 92-93 . with a 15T you will be doing actual 100kmph with 6200 rpm.. simple..


add a FFE + 15T + better air filter + loose extra weight and you'd have a actual 100 mph machine...
i wont do it though.. not practical investment as per my calculation..

so removed the air filter cap + 15T + stiffened front forks + increased pre load on rear + lost some weight + refined the riding skills + maintaining the machine in top shape .. and i am good..




Tyga Performance - Sprocket, Fr. 15T, CBR250R - Sprocket

Amazon.com: PBI Steel Front Sprocket - 15T , Sprocket Teeth: 15, Sprocket Position: Front, Color: Natural, Material: Steel, Sprocket Size: 520 382-15: Automotive

Re: New Honda CBR250R launched in Indonesia

Thanks for the information buddy. I am already planning for a Simota airfilter(bike done 20800kms, soon will be time to replace the airfilter). I would like some reduction in weight as well as a better sound but not those loud ffe's. Also, I agree that spending a large amount of money on a 1.5 lakhs bike seems impractical. Better would go for a N300 or the R25

Re: New Honda CBR250R launched in Indonesia

if i am not simota/cosworth/green are north of 3K+ and k&n around 5k for the air filter whereas the stock filter costs close to 300 bucks which is 1/10 of the price.
i would advise not to go for the same as you would not get any gain changing the air filter. even if the 3rd party performance filters let more air go in with lesser
restriction the ECU runs open loop uptil 6k rpm and would not benefit any way with the more air flow.

downside the cbr already runs lean from stock you'd end up making it more leaner which will increase the engine heat and more wear and tear.
if you want to get a little more sound to make it fun remove the air filter cover below the front seat which will allow better air flow and more sound.

either of the filters wont change the sound if you go for stock replacement. i would suggest you change the air filter at 6k instead of suggested 12k interval
i replaced the filter once at 6k and then at 12k interval and found no diffrence in feel of the bike hence no more change at 6k.

if you still go for the filter replacement go for the stock size ones. do not opt for the universal conical ones as they would do more harm...

as for sound FFE is the only option and anything decent costs 20k+ and makes the bike more like a motocross bike.
you'd only enjoy the FFE or air filter post 6k rpm where the ECU runs closed loop and benefit you further from the changes..

a fuel controller with variable maps is the best bet to juice out but then here in India nothing comes cheap and is not practical with the deficiency of good tuners..

Re: Honda CBR 250R

Good discussion about sprocketing and atleast at the right time for me . I am planning to switch to 13T front in by this Saturday, thats when she is due for her 4th service. I will post the experiences here soon.

I need the bottom end to be a little better as I am fed up of doing the gear dance in mad Bangalore traffic. I hope 13T will prove itself. If i find I am loosing the smooth and unstressed feel, i will switch to original gearing.

BTW, my chain set is a goner at 13.5k and it has no adjustment left, even after lube and clean sessions regularly. Is this how long they last? I am wondering how in world my brake pads are outlasting my chain set. Brake pads are yet to be replaced and look like they have atleast 5K more in them.

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Re: Honda CBR 250R

if you are running an ABS version the normal life of brake pads is 15k+- 1k. (average)
if non abs then 6k.. max 8k ..

the chain set lasts anything between 12k-20k.. depends on riding style.
if the major time you are riding between shorter gears then its quite obvious that the chain is taking toll of the sudden jerks and torque and not widely spread power over higher rpm's and tall gear ratio's.

my chain set went bad (chain went out- uneven slack) at just 10k but still managed another 8k with the same chain. its just at low speeds it used to be little odd with that uneven feeling and more noise...

13T will be fun for city ride and you will be able to redline quicker but then expect a drop in FE.
i will be glad to know the real world FE difference. i am getting constant 34kmpl and now 35+ since 600 kms after suspension mod.
odo 22k+ now..

Re: Honda CBR 250R

Mine is at 13.5k and the chain still has a lot of adjustment left, out of the 13.5k , almost 10k has been pure highway rides and very less city rides and moderate chain maintenance, but still it hold because, lesser gear shifts across it whole life span, riding in traffic and gear shifting and a bit of dragging in each gear for that extra torque puts more wear and tear on the sprockets and chain, hence the low life, if you would have skipped on maintenance then it might have been the same at 10k kms.

Mine front pads are still intact, a few more thousand kms to go, replaced the rear once, strange it was, I do not use the rear as much as the front.


Cheers
Ride Safe
Krishna

Re: Honda CBR 250R

Well that explains the chain wear part. The rear brake pads tend to stick to the disc. You may have to get ot checked occasionally, atleast mine does stick and makes noise. I get it cleaned up every service.

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