POST 50K KM full engine check - Honda CBR250R Forum : Honda CBR 250 Forums
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post #1 of 198 Old 04-05-2013, 02:57 PM Thread Starter
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POST 31K miles (50K KM) full engine check

ok after my engine did 50k KM on motul 7100, the crank needle bearing decided to die.
so guy have a taste of the full CBR 250 engine dissembly including full checks and expected engine components life spawn.

for now i posting the pictures and will post full measurements and calculations i a while

have a look on the inside feel free to ask anything
https://plus.google.com/photos/10227...CPjH2KrBobDhIg


here you can see the old piston and the new piston compared, you can clearly see that the molybdenum coating of the old piston is worn.
and the piston skirt coating is worn

Last edited by Strelok89; 04-08-2013 at 03:01 PM. Reason: changed the link to the full album
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post #2 of 198 Old 04-05-2013, 03:23 PM
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I'm surprised by the extent of the build up of oil deposits inside the engine... had you been using the Motul 7100 since the bike was relatively new, or did you switch to the synthetic oil more recently?

What was the typical operating RPM for your bike?... Cruising RPM?

Was the bike operated primarily for short rides, or for longer continuous distances?

Former Factory Test Rider/Technician
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post #3 of 198 Old 04-05-2013, 03:31 PM Thread Starter
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Quote:
Originally Posted by MotoMike View Post
I'm surprised by the extent of the build up of oil deposits inside the engine... had you been using the Motul 7100 since the bike was relatively new, or did you switch to the synthetic oil more recently?

What was the typical operating RPM for your bike?... Cruising RPM?

Was the bike operated primarily for short rides, or for longer continuous distances?
the engine don't have any oil build ups it's just fresh oil which i didn't wipe before taking pictures, i serviced the bike at 48384KM the engine died at 49873KM

the engine did 1000KM on agip semi syntetic
6000KM on repsol syntetico
another 6000KM on repsol syntetico.(11K on repsol in total)
and the rest is motul 7100
the bike is mine since day 1
most of the time i was riding out of the city on twisted country roads.
most of the time the engine was working at 7000-8000 rpm
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post #4 of 198 Old 04-06-2013, 05:57 AM
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You have driven an astonishing amount of kilometres since buying it. How old is this bike? 22 months? (your forum join date)
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post #5 of 198 Old 04-06-2013, 08:32 AM
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I still don't like synthetic oil, in fact, now more than ever.
It does seem to work well in low rpm automobile applications, however.
But not in my bike!
Correct me if I'm wrong...

IR
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post #6 of 198 Old 04-06-2013, 09:17 AM
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At what mileage was the first service done? Have you ever UNDER filled the oil level?
Surely these engines should be capable of a lot more mileage than this has done without damage.
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post #7 of 198 Old 04-06-2013, 10:02 AM Thread Starter
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RED the bike is 14 month old

Island Rick
the oil looks very good all engine parts looks new, i have critical wear only on the piston skirt.
the crank died because of factory defect. so i will go for synthetics from now.
for low rpm applications synthetics almost the same as mineral oil the difference come at high rpm applications

DJSB
as i wrote: the first service was done at 1000KM
the engine was never ever ever under filled with oil
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post #8 of 198 Old 04-06-2013, 10:38 AM
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Google tells me 7100 is a full synthetic.
engine lasted less than half a life.

now what have I been saying all along about what Honda recommends?




Sent from my mobile phone while driving, waiting for a vigilante Motovlogger to star in his own train wreck.
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post #9 of 198 Old 04-06-2013, 10:43 AM
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So is it still under guarantee? If so, does Honda accept that it is a defect and are they willing to accept resonsibility. If they accept it's a defect why are you doing the repair yourself and not a dealer. I'm just worried that this is the NORMAL life of these engines. If It's a defect in manufacturing surely we all need to know about it unless it's a one off.

David.
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post #10 of 198 Old 04-06-2013, 12:23 PM
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Quote:
Originally Posted by Strelok89 View Post
... the crank died because of factory defect...
How did you determine that this was a factory defect?

If it was the result of a factory defect, you would think that the needle bearing would have failed much earlier on, instead of surviving nearly 50,000 km's. Just saying that when it comes to an internal load bearing part like this, a defect due to material or workmanship will, more often than not, rear its ugly head much sooner than later.

Looking at the original piston, It would seem that the rings were not seated very well during the initial break in of the engine, allowing a significant amount of combustion blow by to occur over the course of 50,000 km. That amount of combustion blow by could then have lead to the excessive wear on the piston skirts. And all that material from the piston skirts has to go somewhere... into the oil, which would then carry that piston skirt material to the lower end crank bearings. Of course this is just a theory of why the needle bearing failed...

Not trying to start an argument here... just throwing other questions and possibilities out for consideration.

Former Factory Test Rider/Technician

Last edited by MotoMike; 04-06-2013 at 01:03 PM.
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