hi,
when I start the engine it sounds a bit rough and I get a slight tingling metallic sound ,its present all the time and the engine also makes tac tac noise on ideal, I showed it to the svc, the mechanic told me that the engine sounded normal, but m still not convinced
is it normal???
the noise is coming from the front near the keyhole (tingling noise) and the tac tac from the engine part eight behind the fan (vertical part don't knw what its called)

hi,
when I start the engine it sounds a bit rough and I get a slight tingling metallic sound ,its present all the time and the engine also makes tac tac noise on ideal, I showed it to the svc, the mechanic told me that the engine sounded normal, but m still convinced
is it normal???
the noise is coming from the front near the keyhole (tingling noise) and the tac tac from the engine part behind the fan (vertical part don't one wat its called)

Did you read the info on the link you just posted? It mentions exactly the same thing i mentioned.
Some highlights from the link above:
'' Application of the rear brake does not engage the front brake until the electronic controller senses rear wheel locking. It's only when the rear brake begins to lock, that the brake pressure is transferred to the front wheel. This allows the rider to use therear brake as a normal non-linked brake for superior control during high speed riding, specially during track days, as this does not come in between the suspension settings and steering control.
On the other hand, when the rider tries to use the front brake,the electronic control senses if the front brake has been applied. Once the electronic control senses that the front brake has been applied, the braking force is distributed automatically between the front and the rear brakes and boththe brakes are modulated on activation and subsequent release for accurate braking and to provide the most outstanding Super Sport motorcycling.''


Does that clear up the doubts?

If i am not mistaken, ABS monitors front wheel only through slotted inner of the DISC, and hence if the rear locks up, there is no way the ABS can sense it and help....

And then what about this ?
The image is from Official Honda website.
Honda Worldwide | CBR250R

Sir, rear also has the slotted disc rotor

Ok sorry..the pics I had did not clearly show the rear slotted disc and hence thought there is no rear wheel lock sense....my bad...
The CBR 250 ,C-ABS does have sensor for both wheels
@Metal_MaNiac and @Aargee Thanks for the knowledge sharing.....

Im pretty sure it isnt wheel locking he is referring to but just the lack of grip on the tyres under hard braking

Sir...what is this???? Sorry & things???

My experience with ABS was very limited when we rode through Panathur to Bhagamandal; one stretch was dense forest, yes FOREST with rocks as side walls & very wet road. sayhi2sai was generous to let his Galfer fitted ABS ride on this stretch & the experience was totally amazing, total confidence & sheer brilliance. Only thing is one has to get used to that "tick tick" noise when ABS kicks in & shouldn't panic to release (and I did that few times ) the brake.

Again, if people who are still confused about the working of C-ABS, go through this as well
2009 Honda CBR600RR C-ABS Review - Motorcycle.com

Some pointers from this link aswell:

Posting a wrong info is dangerous for the members to believe in, hence i said sorry , and thanks for giving me knowledge so i won't repeat it..
The link @ Metal maniac had given explains ABS clearly...and at the same time is a bit confusing...it says " high deceleration is obtained when the foot brake is applied, but this system assumes a sports ride when the hand brake is applied (on the front wheel), thus allowing the front brake to function independently."...
So if the front brake is applied it is no Longer Combined ABS, but independent front braking
Which also means that ONLY the twin caliper pistons of front three pot Caliper,will work, when applying the front brake ...

and the foot note says.
*Combined brake system is designed to assist braking operation. The basics of braking concurrently operating the hand brake (front wheel) and the foot brake (rear wheel) according to the circumstances should not change.
*ABS is not designed to shorten braking distance, but assist braking operation. Therefore, just like with vehicles without ABS, it is necessary to follow save riding practices such as decelerating sufficiently before cornering. The system does not control reckless driving.

members please clarify...
A big thanks again for the knowledge ...

Aaha...Tks to you as well Ji

OT - Time & again who the hell is rating this thread poor but refuses to show up the reason? It was rated 4.52 this morning by 75 votes, last 2 jokers whoever rated it poor is not stating the reason due to which is 77/4.45 now. Why this kolaveri? Why not come forward to share what needs to be improved instead of hiding your cowardly face? Be a man!!!

Thanks again for the 600/1000 RR C-ABS review....They are Technically different from the 250R's...

Ive seen a link of Cbr 250R's engineering talk/pre release walkaround where a guy mentions how its ABS functions. And IIRC i think he mentioned that the ABS is activated by pressing the foot pedal and not the front lever. Thus ABS only kicks in when the Rear brake is activated. The Front lever is going to stay independent as long as there are no signs of wheel lockup at the rear. If the sensor does detect lockup then it will also command the Front brake pressure to maintain constant speed between the two wheels.

I'l see if i can find more info on this. However do not take my word for it until i get proof.


Edit: Found this:
Note:

a) The CBR250RA does NOT use the Electronically Controlled Combined ABS system from the CBR600RA and CBR1000RA models which a much more complex and expensive system. Essentially that system is "brake by wire" and is designed with the super-sport / track day rider in mind. (the schematic "Ducky" posted above is ECC ABS).

b) The CBR250RA CBS actuates one of the three pistons in the front brake caliper upon application of the rear brake (pedal), though the front brake lever remains independent of the rear. Comparatively, Honda's DUAL CBS and adds rear braking with application of the front brake lever (with variations on # of pistons applied per caliper depending on specific model dynamics). Honda CBS systems use a delay valve to reduce the front wheel braking force upon "light" application of the rear brake pedal (i.e. during technical or parking-lot maneuvers). This prevents unexpected behaviour, or perhaps better put, prevents the chassis being upset (or the rider for that matter...) if applying the rear brake in a low speed turn.

c) The CBR250RA ABS system is "enhanced" from Honda's previous generations by combining the ECU within the ABS modulator (previously a separate ECU was used) to control each wheel's ABS function with more precision. (CBS systems without ABS do not use ECU control)

So the answer is:
a) Yes it is electronically controlled.
b) No it is not like the CBR600RA/CBR1000RA system.
c) When using the rear brake lightly and/or at low speeds the front brake application of the CBS is delayed slightly to prevent unexpected braking behaviour (response) from the bike.


Tada Found proof: http://www.youtube.com/watch?v=gZ5LoqcrErY

Yes you are spot on..the 600/1000 ABS senses the brake pressure applied ,and through a set of Pneumatic motors /pump apply pressure to the calipers...the feel on the braking lever is artificially simulated by having liquid resistance through rubber diaphragm modulated by the electronic control unit....
Thanks for the DIGGING and Sharing.