Re: Honda CBR 250R

Clean chain first (many a times its a case of stuck plastic pieces in the chain that gets very irritating)...

Also there is a rubber like chain guard in place to keep the chain on track... see if that has a problem and replace if needed.

'kirr... kirrr... kirrr' sound with intervals is chain... kirkirkirkirkirkir a little faster could be wheel....

Need to know more to say anything Hy.

Hope it gets sorted... my suggestion is tackle the problem with simple solutions first...

Cheers.

Similar stats on TwoBros Street exhausts...



Gain of...




5-8 kmph in terms of top speed only yes, but overall it feels like the bike is a tad bit more eager and nippy in all rpms... not too much of a difference like buying a more powerful bike altogether... But say you already have something more powerful and want to add a little more bite to an existing CBR 250 in the garage... its for things like that I guess.

Nice discussion.

Re: Honda CBR 250R

Sorry mate,

couldn't help but barge into this interesting discussion.. Well with just a slip on exhaust and the DB killer installed there won't be any noticeable difference between the stock and the Slip on. With the DB killer removed the differences will be slightly visible in terms of engine being slightly more revvy. With Gas Flow Porting + Slip On with DB killer removed the performance difference between stock and this set up would be very much noticeable:

* The low end grunt will be more pronounced in comparison to stock,
* Engine will become lot more smoother due to volumetric efficiency achieved with gas flow porting,
* The overall vibrations will reduce,
* The acceleration timings will improve in comparison to stock
* The most visible thing will be the way the vehicle would gather speed in comparison to stock. If the stock CBR post 120 kmph takes time to hit the top end, with the above mentioned set up the rider should notice that the vehicle is taking much lesser effort to hit the high nos. on the speedo.
* Due to the sprocketing of the stock bike, one should not expect extremely high speeds without altering the gearing, installing high lift cams or pumping in more fuel by using piggyback ECUs like Dynojet DFC with custom aggressive fuel maps. Top end will remain more or less same (at the max +-5 kmph more over stock.)

The dyno curves shared above are with the Db insert removed..

However,as blabbered earlier.. it is advised to interact with the existing users and see the real term test reports... Questioning everything is always encouraged..


Cheers,

Re: Honda CBR 250R

Yes, that's why the discussion. This is something that I always wanted to know. Apart from hot rodding the engine which I'm against; exhausts and filters and ECU mapping are terms that cross a learner's mind. My queries were to know that after spending 25k on a slip on, I'd be getting around 5-8 kmph extra and some extra boost in torque throughout the rev range.

Basically, I was trying to calculate the VFM-ness in the entire process involved.

Re: Honda CBR 250R

'around 5-8 kmph extra and some extra boost in torque throughout the rev range' - blinds the VFM part.

Re: Honda CBR 250R

Exactly! Why don't people get that?

Re: Honda CBR 250R


It's more of a fetish kinda thing Divya, having a akra does makes one feel a bit better..:-P

Crying sitting on a akra fitted CBR is better than crying on a stock CBR...:-P Lame joke, I know...hehe



Cheers
Ride Safe
Krishna

Re: Honda CBR 250R

I'd hardly call that blabbering by you Shv... very nice discussion earlier too with the gas flow porting... Just desperately need a few first hand reports now ... to study it through for fun.

Me too man... Not too much into hot-rodding, in fact I hate it when someone relatively new to riding buys a CBR and goes ahead to spruce it up early... I'd always suggest juicing out the stock to its fullest before extracting more out of it. Its a lovely machine and its well built by itself with incredible balance in every aspect.

Also someone thinking about performance upgrades isn't thinking about VFM in the same sentence... Its like cigarettes i guess... no VFM, bad for health, habitual or even creating false illusions with a bump in body hormones... but we still chase its highs as humans ... that said...

Just met a new CBR150 owner the other day at the ASC, young chap, he rode in with an after market exhaust that was welded in place outside somewhere... The piping was literally burning the plastics below with a singeing putrid smelly fume of white... His odo had done 900 kms... Laughed in my head for a long time.


Also guys doing high RPMs a lot, please check the rubber hose beside the radiator for wear and tear at regular intervals, replace if any is found... do also check on the metal clips that hold the rubber hoses in place periodically and get them replaced if you see signs of loosening up.

Cheers all.

Re: Honda CBR 250R

Mate ,

when it comes to hot roding, believe me you can never ever justify the VFMness in comparison to stock. If you look at senior rider abhimanyu's list of mods, he has already spent half the value of a brand new Ninja 300R on his bike with state of the art stuff like Marchesini wheels from Brembo, ASV grips and only god knows what else he has more in store for his beloved vehicle!!

Your bike is an extension of your persona, so personalising it has always been embedded deep inside us every rider, even for an HH splendor owner with the LED light strips wired badly on his bike.. Earlier i used to wonder why people act crazy and stupid going for crazy mods... but after watching the motorcycle documentary "why we ride" i now understand the emotion behind it. For some it may be a simple stickering job or light conversion, for some it may be slip on exhaust and other stuffs..

Heart has reasons sometimes the logical brain and the bank balance can never justify!!..

Regardless, learning from the experience of my past, even though i am confident what i am sharing here will hopefully benefit other riders taking informed decisions, without proper long term test logs shared by respective riders i am clearly putting forward a disclaimer that: i would neither promote or recommend things less we repeat the whole story over. Again from an objective point of discussions: head porting will not reduce the life of the stock engine as the only thing that is altered is the increased and efficient delivery of charge. No changes are made to the valve train system, nothing is messed around with regarding the timing. Only the delivery of AF charge is improved over stock. If done right the benefits are profound, if done wrong well, on my FZ18 thread i have already shared what it would lead to..

Regardless, @krish: mate being suffering from OCMD (Obsessive Compulsive Motorcycling Disorder ), i couldn't help but do some R&D of my own and now i can confirm that Fuelmoto USA, does provide you custom maps for the Dynojet DFC piggyback ECU with lifetime support of fuel maps of the same. Unlike a certain "Parts supplier", they do provide you 24X7 support and can remotely take over the ECU and map it if required provided you have access to a fast internet connection..



One only needs to provide them the whole year's weather pattern (as shared by abhimanyu on his post with his Fuelmoto ECU for his Ninja300R on the ninja 300R ownership thread) and they will provide you custom maps for the same. The beauty of the set up is: they can customise the maps based on any performance upgrades you may do with your bike in future which may include performance air filter, a complete FF exhaust etc.

On their site, they have clearly mentioned that only those Dynojet DFCs which have been sold by Fuelmoto will get this support. Anyone who has purchased the same directly from Dynojet or through some other seller will have to get in touch with their respective sellers only and will not be supported by Fuelmoto.

In a true sense this ECU is a no-wires-cut, "plug & play" system as shown in the installation video below:




NOTE:
The above mod is only for a performance enthusiast and not for riders looking for power, FE and everything at the same time.. If you go for the performance route, donot expect FE as stock!! If someone is looking for something more than just stock, this seems to be one of the ideal options to choose from as the after sales support from a states based company is guarenteed.


Cheers,

Re: Honda CBR 250R

Ah..you explained what I intended to say, but did not know how to put in down.

And about the FuelMoto...that's great, so atleast when I decide to go for the Full system, I am definitely going for fuel moto Kit and custom maps..!!

But first steps to be covered are the slip-on and a Free flow filter.Need to educate myself more on that and then decide about the rest, it is as tehy say, One step at a Time.

Cheers
Ride Safe
Krishna

Re: Honda CBR 250R

Hope you guys don't mind my butting in ... I am not a CBR250 owner but thought I provide some clarifications to @Divya Sharan. Here is the low down on slip ons:

1. As a general yardstick slip ons do not provide huge power gains. Normally it will be within 0.5 to 1 bhp gain. The torque gains will be even less in many cases. However, much depends on how restricted the stock system is to begin with.

2. Modern bikes are very precisely tuned for fuel economy and emission control. Most of these bikes are tuned on the leaner side. Therefore, while in most cases a slip on will not require a fuelling change, depending upon the how restricted the stock system was and how lean the stock fuelling is, using a slip on its own may create flat spots in the power band.

3. While in most cases a slip on will not provide power gains, it will definitely reduce good amount of weight and mass. The general yardstick for such a weight loss is around 3 to 4 kgs.

Now coming to your query of whether you will get around 5 - 8 kmph more out of a slip on. The answer is no. Your top speed is dictated by the gearing of you bike, therefore, with stock gearing you will get slightly better acceleration but your top speed in each gear will remain the same as stock.

Re: Honda CBR 250R

Thanks for pitching in with some valuable info Abhi, your down low on aftermarket exhausts benefited me too... Much appreciated and butt in anytime.

That is invaluable. So all you need to do is give them a detailed yearly weather report and they come up with a custom map thats made in accordance with the mods youve put in place? Seriously good to hear.

Re: Honda CBR 250R

Hello friends,

Today I gave my bike for it's 3rd free service at 11396kms on the odo to 21 Honda in Powai. The following problems were mentioned to the service advisor

1) Fuel pump needs to be replaced (will be replaced under warranty due to fuel indicator malfunction)
2) Shims need to be checked as the engine makes a metallic sound from 4k rpm to 6.5k rpm. This was asked to be done is warranty. However the service adviser said that if the shims have to be replaced the cost would be about 2000 RS. Members who have had their shims replaced during the warranty period please shed some light on the time.
3) My indicators are turning brownish. Also in the monsoon i can see some water residue inside the turn indicators. Please let me know if the same will be replaced under warranty.

I've told the service advisor that if he cant replace the shims in warranty to give me a call and I will send a email to Honda for the same. The bike was dropped off this morning and I have not yet received a call yet.

Thanks in advance.
Taher

Re: Honda CBR 250R

[QUOTE=taher70;1038008]Hello friends,


2) Shims need to be checked as the engine makes a metallic sound from 4k rpm to 6.5k rpm. This was asked to be done is warranty. However the service adviser said that if the shims have to be replaced the cost would be about 2000 RS. Members who have had their shims replaced during the warranty period please shed some light on the time.

Cost of a shim is approx. Rs.200

Re: Honda CBR 250R

What is a shim? I have read a lot about this shim issue, but have no idea what it is.
My CBR is just about 2 months old though. About 1300+ kms.

Re: Honda CBR 250R

Hi Guys,
Which is the best service centre In Hyderabad. need an urgent reply.