Re: Honda CBR 250R

That's probably the most beautiful CBR I have seen mate! Amazing

Re: Honda CBR 250R

The picture of console looks a bit blurred to me. Not able to see the customisation done here.

Re: Honda CBR 250R

Console is same no changes done there we just wanted to show graphics on tank.

Re: Honda CBR 250R

Repost the pic in better quality please. Really love the work you've done on your bike.

Re: Honda CBR 250R

I do not frequent xbhp, hence this delay in responding. Well Pirelli is meant for performance which means the tires are soft, offering a superb grip on the road. It will at least go 10k easily if you are not into burnouts, etc. I will say it is much better than Michellin! You can try Dunlop if you want hard rubber like that offered by MRF and you can have it for at least 2 years.

Re: Honda CBR 250R

I'd left the bike idle for two days and today it started with single crank but died after 15 secs.
After that it wouldn't crank even though the cranking sound was very strong and clear.

Called up the mech and he said may be due to the decompressor not working properly. Suggested to crank with full throttle and keep the revs high for a few secs once started.

This worked well with only a hiccup in fueling once I started off which was easily solved with blipping a couple of times. Rest of the journey was uneventful.

Has anyone experienced this? Experts please advise.

Re: Honda CBR 250R

Sounds like a case of air lock to me and nothing with the decomp.

In case this happens again, try opening the tank cover for a bit and start again.

I strongly suggest not starting an FI equipped bike with throttle full open. Plus revving a cold engine will also damage the engine internals as oil will be yet to reach all parts of the engine.

Sent from my MI 3W using xBhp Connect mobile app

Re: Honda CBR 250R

I too thought air lock and tried with tank open, didn't work.
Honda manual recommends cranking for 5 secs with throttle open in case of flooded engine, this worked in my case.

Most forums point to a jammed idle air control valve but I feel that since problem occurs when bike is idle for long could mean either too much too much fuel in line which combined with rich mixture at starting leading to flooding.

Senior members please advise.

Re: Honda CBR 250R

P 38 of the user manual
If the engine fails to start after repeated attempts, it may be flooded.
1 Open the throttle fully.
2 Press the start button for 5 seconds.
3 Follow the normal starting procedure.
4 If the engine starts with unstable idle, open the throttle slightly.
If the engine does not start, wait for 10 seconds, then follow steps 1 - 3 again.

Number of factors - how long since you replaced the air filter? How many kms has your bike done? If over 30K, perhaps you might want to replace the fuel filter.
Injectors might also be getting clogged, perhaps using System G for a few tankfuls will clean them up.

Re: Honda CBR 250R

Bike has done over 33k kms. If injectors are clogged then it would also show up as jerky acceleration during daily rides.

Will check about the air filter replacement and update.
One thing which bugs me is that why does it Start with the procedure given for flooded engine? And if the engine is really flooded, what could have caused it?

Re: Honda CBR 250R


My two cents, from what I've gathered, a fuel injected engine does get flooded like a carburetted engine, given the circumstance. When the bike is let to sit idle for days and at varying temperatures, especially on the colder side, a FI engine "can" get flooded, even though here in Ooty, the Blade comes to life at a less than two cranks. What this basically means is your spark plug gets due to excess fuel thereby restricting the plug to provide a good spark, remember what you combust in the combustion chamber is a fine mist of vapor mixture of both the gases, not liquid per se. What happens when it floods? It doesn't crank, it takes time for the spark plugs to get back to right temperature for it to get cranked. On a four plugged engine, this is far worse, usually it ends up towing the vehicle.

Usually a flooded engine just cranks, it doesn't fire, keep that in mind. If the engine starts up and then switches off, it can't be considered engine flooding. FI systems are intelligent in assessing every parameter right from the stroke position to temperature of the coolant, whose parameters are taken into each time when the bike is cranked from switch off position. Hope that clears the first part.

Now to your second part, why opening the throttle results in cranking as per Honda procedure. You see, on almost all FI engines, when you WOT during start-up the ECM cuts fuel supply to the injectors, why? Because it thinks you're going to flood the engine with WOT and gives the injector the command to spray only when you release the throttle, as you'd normally start. So WOT during starting means, ECM cuts fuel supply, and when you crank with WOT in a flooded scenario, the remaining fuel in the combustion chamber is burnt and then you restart as normal, that's exactly what Honda has mentioned.

Bottomline, WOT on a FI engine means no fuel spray during start-up
Release the throttle, it takes everything into its own hands,

Beautiful isn't it.

Cheers!
VJ

Re: Honda CBR 250R

Hello I am back with the solution and With One more problem :
Abdul checked the air filter and he said everything was fine . Now checking the 2nd solution took some time . but my parents gave a green signal for short trip to Udaipur and tested the Throttle response over 780kms approx( had no Patience while coming back ) . I gradually increased and decreased the throttle and didn't go over 110 and The Mileage was back to 34-35 ish
Thank you Psr and Argee sir .

Now problem I am facing is with the battery/Electrical and this problem has been there for quiet long time ! Whenever headlights are ON for quiet long time, after Pit stop the bike refuses to start ! But Headlight, Horn, indicator works fine. So, at my 2nd and 3rd run I kept the headlight ON for 200kms and kept the Headlight OFF till next fuel bunk which is 70-80kms more (This was done in broad day light !) And the bike Started at the 1st crank and it was all normal again. Can someone please help me with this issue ?

Sent from my Nexus 7 using xBhp Connect mobile app

Re: Honda CBR 250R

Thanks. You've explained perfectly what goes when we try to start a flooded engine.

What I was trying to understand was -
1) why does a FI engine like ours flood?
(My 2cents on this- switching off the engine immediately after stopping leaves some amount of fuel in the injector line. This combined with the rich mixture at the next start gives a very rich, incombustible mixture, causing the stall and subsequent inability to start. I'm guessing the the hotter, thinner air here doesn't help too.
Cranking with WOT then takes care of it the way you explained. Please correct where needed)

And 2) like you mentioned if the engine starts and then stalls it may not be flooding, then what would be the root cause here? Is it worth investigating idle air control valve here?

Thanks again for your detailed explanation.

P.S. - at this point I feel I'm over thinking about this issue but I hope we end up learning more about our bikes even if it doesn't yield in a perfect solution.

Re: Honda CBR 250R

Use electricals only when bike is switched on. That is when it is at least idling. Otherwise battery would drain out. This applies to all vehicles with DC setup.
How old is the battery? It maybe up for replacement.


Sent from my phone. Kindly avoid it while riding.

Re: Honda CBR 250R

I feel owners having cold start issues should check with the Idle Air Valve getting restricted with dirt...