Re: Honda CBR 250R

The Crank and Piston can compress only gas or air...not any forms of liquid...which is why it is called Hydro Lock ..and when the crank keeps moving and the top of the piston cannot move any further due to presence of water..something has to give in...in the case of engine, it is the Conrod. which bends.

You have so far escaped engine death due to Divine Intervention . If you had little water of say 5cc or so,in upper cylinder, then your engine will still turn but the water will short out the spark...and so no start. after about 4 cycles or more, water will get ejected through exhaust , though the cylinder will still be wet and will not start...once enough petrol vapor saturates and all water vapor is scavenged, the engine will start.

Since most of water had gone into the lower crank area, you have been saved....still as long as white foam appears, you have water vapor inside, which is not good for engine parts...keep an eye on the engine oil color and foaming....one of the best method to get water to vaporise is to go for a ride of 1~2 Kms, and keeping bike on stand, start and let engine idle, and open the oil pour plug and keep it open...as the engine heats up, water will start to evaporate and cum out....either as white foam or as vapor. if oil is splashing out then keep a soft cloth on the mouth to prevent this... after may be 20~30 minutes, depending on amount of water inside, all or most of it would have come out .
Another method would be to drain the engine oil, and pass through filter paper layers, cloth, to let the medium absorb the water.
Good Luck

Re: Honda CBR 250R

Thank you once again Psr sir.

I think the water inside the engine is completly gone out due to my ride of approx 25 km per day which totals 170 kms of ride so far. The engine oil is clear now, and internals too looks clean.

Oil through inspection window


Internal view from oil filling cap


Looks like i have nothing to worry, just need to inspect it little more frequently than needed.

And i will be changing the current oil soon, may be directly to shell ultra.

Ram

Sent from my C1904 using xBhp Connect mobile app

Re: Honda CBR 250R

Engine looks clean...but the water Vapor need an outlet...Please check your Air Filter and Inside of Air box for traces of water vapor...if you find it, wipe it clean with a clean cloth...check Air Filter for Wetness..
Good Luck.

Re: Honda CBR 250R

Dear PSR Sir,

Thank you for all the knowledge shared across the forum. Quoting you to request some knowledge on the below.

In the scenario being discussed in the above posts, it is clear that water entered the engine through the air intake. My question is on the possibility of water entering through exhaust.

I understand that while wading through (say) knee level water, when the exhaust is submerged, it is advised to keep the engine RPM high so that the exhaust gas pressure is higher than the water pressure thereby ensuring water does not enter the engine through the exhaust.

However my question to you is - How possible (and perhaps rare) is the scenario where water can enter the engine through the exhaust when the vehicle is parked and the exhaust is submerged in water? Let me go ahead and specify that (for the sake of the discussion) the air intake is still above the water level and is not submerged.

Thanks.

Re: Honda CBR 250R

Hi,

Its as you said the possibility of water entering the engine through exhaust is less. About 25% according to my knowledge.

As you know now a days almost all engines(single cylinder) are 4 stroke and in out of those 4 stroke, only in one of the stroke the exhaust valve is open. So for water to enter a stationary bike, the engine should be shut down in the exhaust stroke. Else the water will simply be in the silencer and come out once the engine is started or moved out of water.

Please correct me if am wrong.

Ram

Sent from my C1904 using xBhp Connect mobile app

Re: Honda CBR 250R

Has anybody thought of installing petal discs onto the CBR? Mine are almost worn out, and need replacement in another 3K kms. Been thinking about this, would it be mechanically possible?

Re: Honda CBR 250R

yes its is possible.. however the real gain for petal rotors are less weight sometimes and more cooling.
if you want better braking. look forwards for a DIY mouting braket a bigger disk and better brake pads.
just changing to petal rotors and rest setup remaining same nothing will change... nothing at all but a lighter pocket.

Re: Honda CBR 250R

Water finds it's level. Unless the outside water level is more than exhaust valve height, water cannot enter through Exhaust...and this is assuming that the Exhaust valve is in open condition. Most of the times when engine switches off it stops at compression stroke . ie., when Piston is coming up and Valves are closed. Rarely will it stop with valves open....You would have noticed that even in the case of Iam_Hoodi_CBR , the water entering the Airbox filled the lower crank case and not the Head.
Petal discs are less efficient than conventional circular vented discs. . where the petal edges are cut in shape , there will be no grip for the Pads . (nearly 20 % less). It also leads to quicker wear of the Pads.

Re: Honda CBR 250R

An issue with PGM FI bikes - engine stall when chopping the throttle/while downshifting.



How did you guys resolve it?

Re: Honda CBR 250R

Guys... How often should i replace my fuel filter ? I bought my bike used. And since then it has done 15000kms. Havent changed it yet. Also is it a diy? Or do i need to go to the svc..

Re: Honda CBR 250R

I have faced this a few times in my CBR. Thanks for the video post. Should have constant throttle when downshifting I guess.

Re: Honda CBR 250R

My bike started giving the engine stall issue within the second year of ownership. At one point I almost got killed when the engine turned off just as I overtook a truck, which caused the bike to sway toward the truck, rather than in front of it. Luckily the driver slowed down, and I thumbed the starter within a second. I took the bike to the didar Honda svc and the mech poured wd40 in the switches!

Another issue I faced is that after riding with moderate throttle for a while, when I slow down, the engine shuts off and does not turn back on, no matter how many seconds you thumb the starter, unless you give full throttle simultaneously.

I don't have either of these problems for the past 2k after I removed the air filter cover.

Re: Honda CBR 250R

One Possible reason is that with sudden closing of throttle blade, the AFR becomes very rich and this leads to engine getting flooded. still the PGMFi should be able to correct it through ICAV ...Try the Earth Wire mod and see if problem is solved, since some owners have confirmed that the Secondary Earth wire did solve this problem..

Re: Honda CBR 250R

Installed new battery... The old one died. Couldnt get an amaron. Do had to go with exide...

Re: Honda CBR 250R

Hope it lasts! Keep the warranty card safe you ll definitely need that. But the irony is that it usually fails just after 2 yrs when ur warranty expires. :P Happened to me twice. Whatever, Let's hope for the best.