Re: Honda CBR 250R


Thanks Buddy!! Will check.

Re: Honda CBR 250R

Your coolant level infact is low, if not too low at least when viewed from your angle. With the bike upright, or someone holding the bike upright, the coolant level should almost fill half of the reservoir. In layman terms the reservoir would look aqua blue. But from yours I can see it's quite low in fact. I'd suggest first check with the bike up right after parking the bike overnight. If it still is the case as you've posted above, you require coolant topup.

Guys let me put this in perspective. There is so much confusion with this ECU remap thing. Disconnecting the battery WONT and WILL NOT clear the ECU of its error parameters or its stored error data. What it effectively does is it temporarily forgets your riding pattern, not the very data itself. It's just like deja vu for the ECU after a battery reconnect this time with more precise inputs feeding it. ECU error is always indicated by the flashing MIL amber lamp on the CBR's console, which almost usually indicates a visit to service personnel to find out what error it is and then clear the error codes.

What we've suggested with this disconnect and reconnect is a cheap trial and error fix and then proceed if with other parameters if the issue isn't solved. What I'd also suggest in case of frequent stalling is the condition of the air filter themselves, blockage or bogged down air filter too can cause intermittent stalling.


Good click mate, and good info.

Cheers!
VJ

Re: Honda CBR 250R

Eggactly! Its not a remap, its a reset of its stored memory of our riding habits. Like rebooting a phone.

Thanks for the replies, folks. Blackthorn, I replaced air filter 6000 kms back, the problem persisted after replacement. 😤

Why I suspect the ecu now is because I read a news article that Honda changed the ecu in 2013 models, to make the bike run leaner. Why would they do that, unless the previous model's ecu was running rich?

Before the ecu reset, the bike ran differently each time. Some days it felt eager, jerky and fast, other days it was hesitant and slow. After reset, throttle response is the same each time I start it. Especially at low RPMs. Its behaving like when I first bought the bike. Now 10k rpm on second gear gives ~68 kmph. Can somebody check their cbr250 at 10k rpm in 2nd gear and report the speed? Tia.

Re: Honda CBR 250R

Bro i clicked that pic when my friend was holding the bike upright. Anyways i'll check it once again tomorrow morning, if it's the same, will topup the coolant by evening. Thanks bud!

Re: Honda CBR 250R

Thanks to ever increasing emission norms, manufacturers lean the AFR, purely due to adherence to emissions standards. The throttle response should be the same across the RPM range, it shouldn't flutter or misfire, which is actually a good sign meaning the bike is actually is re-learning. I'd suggest you check your air filter again and replace it if necessary.

Cheers!
VJ

Re: Honda CBR 250R

Does oil filler cap comes with any kind of gasket?

I am seeing a lot of oil deposits around the oil filler hole and there is no gasket on the filler cap. Rubber gasket on oil filler cap is present in my other bike (FZ16)

Re: Honda CBR 250R


There is rubber O ring which is attached to the oil filler cap.

If that O ring is busted, get it changed.

Cheers,
Sanjay

Re: Honda CBR 250R

i highly doubt that disconnecting the battery makes it 'forget' the riding pattern. it might be the case with certain ecu's (Car's/bikes) in the past but not the current crop of ecu's. i remember reading about this. i think it requires a specific tool to 'forget' and re-calibrate itself. i might be wrong wrt cbr and would appreciate if someone could share a manual/document where it points to this topic.
example: on the ktm's, disconnecting the battery will not do anything but just reset the clock. but using their tool and clearing the dtc/memory will cause the ecu to 'forget' and this can be felt in the way the bike behaves i.e. the first 15 to 20 minutes it will jerk/shut off at times on leaving clutch and idle a bit erratically. i get it done at every service. it is recommended to let the bike idle for around 15min after clearing the memory and it settles down to normal.

Re: Honda CBR 250R

I wrote earlier about this. You are right and people are still 'believing' that the ECU resets by a battery disconnect. That is misinformation. Nothing is reset except the clock, the bike forgets nothing that is stored in the EEPROM. I have no idea why people believe the bike is behaving better when nothing has happened at all. You can do it the 'easy' way by using the Honda HDS tester, or you can do it the manual method by removing the ECU, jumping the DLC wire and following the instructions given below.
@Divya Sharan shared this link earlier and I need to share it again so people can understand the effort that goes into resetting the DTC.

How to reset an ECU unit on CBR250r ~ Honda CBR 250R Malaysian Community Blog

Also sharing a video link - click part 2 and 3 as well to know how much needs to be done.



Since people don't want to search for a service manual, here we go.

1) HDS Tester procedure - note what it says for page 5-50 of the service manual.



2) Manual reset :



3) Page 5-50 (needs to be done for idle throttle setting after ECU reset).



And still people insist that there is a difference after removing the battery!

Re: Honda CBR 250R

O ring is not present in my bike. It wasn't there after first service. and i have been running it w/o o ring since last 7 months and 7000kms. Can i get this O ring from roadside vehicle repair shops incase its unavailable at honda A.S.S.?

Any size specifications? Couldn't find anything in the manual.

Re: Honda CBR 250R

The size is 18x3 mm. You may get it at service center as well as from other autospares shops.

Re: Honda CBR 250R

AK3D the extensive elaboration you've given is absolutely right, pictures, videos, you're right..But you're off-topic, here's why.

What I would encourage is not to drag around a single notion of what works or what doesn't unless you're sure you have experience on it. I've had this fair share of experience in my car, where it used to judder in idle every morning. It literally took us weeks to figure out everything, OBD diagnostics, injector cleaned, spark plugs replaced, ignition coil checked, everything was good and still we had the same problem for close to two months. That's when we did this ECU reset drama. We did a 30 minute ECU battery disconnect/reconnect and let the car idle for close to 10 minutes without touching the throttle and revving to redline a couple of times and did high speed, low speed and normal driving stints and it's been close to a year since I've ever had that issue.

I appreciate the "elaboration" you've given is absolutely fine, but it is "meant" to clear and find error codes, and reset. I've nowhere said it's a permanent fix, it's a trial and error basis and it doesn't always work for everybody, as I again said, trial and error.



Remember I and we all are still learning a ton of information daily. Throating down what is your side of perspective is not what it is all about. We are here to help and learn, and starting with what's easy helps fellow folks know their machines better, not everyone is equally adept in understanding the technical know-how and then delve into complicated resolutions.

Please go through my earlier posts twice or thrice to discern.

Again it's up to individual's mental potential, whatever he/she understands between the lines.

Cheers!
VJ

Re: Honda CBR 250R

I am not off topic when the thing under discussion is the ECU reset procedure for this particular bike. Not only is there a lot of misinformation being shared, it is misleading for anyone who would refer to these posts.

Trial and error doesn't mean that whatever someone says overrides the details given in Service Manual. It implies the rest of us know more than the engineers who built the bike.

I don't care about your encouragement. I see there is a reason why senior riders or experienced people do not participate in these forums and it is precisely because of these reasons. Half baked knowledge is shared and newcomers lap it up as if it were the real thing. There is a difference between every vehicle, be it your car, be it a CBR250R or a KTM duke. Your car's experience is not relevant to the CBR250R. Every vehicle is different and implying that another vehicle's methodology for a particular troubleshoot will work on this one is plainly not acceptable.

If you read the posts (and the clearly mentioned links) - that is the procedure for resetting the ECM. There is no here and there about it no matter what anyone says. As for mental potential, that much is clear, at least.

Re: Honda CBR 250R

arvstreetracer is absolutely right, it is 18x3. Running without that O-ring isn't crime per se.
The O-ring is present to prevent the oil from the clutch basket weeping via the hole. If you've observed in some bikes after you've had a super spirited ride, you would see small amount of oil weep around the oil filler cap. The O-rings are there to prevent this weep and provide good seal between the cap and the casing.

In case you want to get an HMSI part, the part number is 91307-035-000 O-Ring 18x3

Cheers!
VJ

Re: Honda CBR 250R

Thanks for the detailed info, guys. Good to have different perspectives. I don't have the mil blinking, so there is no need to clear DTC and reset ECU. I wasn't able to reproduce the auto shut off when the Honda asc mechanic checked it for a 2km ride.

Perhaps another cbr250 owner can try disconnecting the battery for 15-30 minutes and post their experiences? That way we can find out if its a placebo effect or a real change.

I'm not holding any belief, just posting my experience.