engine turns, has spark but does not strart - Page 6 - Honda CBR250R Forum : Honda CBR 250 Forums
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post #51 of 59 Old 01-24-2014, 12:24 AM Thread Starter
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I removed the valves today and I found this.
There is a crack inside both Intake valve ports.

https://docs.google.com/file/d/0B1Kw...t?usp=drivesdk
I called a local machine shops.
One said to bring it in for a look and the other said that the cost to repair it will be way more than $130 which is the cost of the new head.
Could this explain high carbon build up and oil consumption?

Last edited by Giko; 01-24-2014 at 12:39 AM.
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post #52 of 59 Old 01-29-2014, 05:43 AM
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I can't really see the crack in your picture. Is it the valve seat insert that's cracked or the cylinder head itself?
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post #53 of 59 Old 01-29-2014, 05:33 PM Thread Starter
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Quote:
Originally Posted by roadster View Post
I can't really see the crack in your picture. Is it the valve seat insert that's cracked or the cylinder head itself?
Its the white line in front of the arrow. The crack (or grove) is on the head about 1mm from the valve seat insert.
It's more like a grove since it does not go all the way through.
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post #54 of 59 Old 01-30-2014, 05:01 AM
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Quote:
Originally Posted by Giko View Post
Its the white line in front of the arrow. The crack (or grove) is on the head about 1mm from the valve seat insert.
It's more like a grove since it does not go all the way through.
I see what you mean but it doesn't look like a crack from the picture. I would probably clean the surface with emery cloth then examine it again. If you are not satisfied with visual inspection it is possible to get a crack detection 3 part spray kit. These are typically used to check welds but should work on alloy.

Regards Roadster
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post #55 of 59 Old 03-30-2014, 12:52 AM Thread Starter
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UPDATE:
Bike is running!!!
I rebuilded the top end myself and it runs. After speaking to a tech at a machine shop, I decided to reuse the head. He did not think that the problem with the valves serious. I did replace the cylinder, piston, and I laped the valves.

When the engine failed I felt like droping the whole bike of the cliff and watch it brake in to 1000 pices. I was so down and I thought I had the worst luck (buing a used bike). Now I can say that the engine failure was a blessing. I really enjoyed rebuilding it, and will even say that this is my new hobby. I might even take it all apart durring next winter...
Today when I started it and heard it come alive,... it felt really good.

Technical details
I tried to stick to the service manula as much as possible. Since the manual did not call for honing of the cylinder, I did not do that. The new cylinder did came with a cross-hatched pattern, which looked identical to the old cylinder. One corner that I did cut was when I reused the original connectors when re-connecting fuel pump. The manual called for using a new piece. I carefully inspectd the connector and found it to be in good shape, flimsy but mine was okay so I reused it.
I'm vary happy to be back in the sadle

thank you all for the help.

Roadster, beer is on my if you are ever in Nova Scotia
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post #56 of 59 Old 03-30-2014, 03:53 PM
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I love happy endings!

Snot nosed 68 yr.old kid.
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2013 cbr250r a RED one!
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post #57 of 59 Old 03-30-2014, 07:58 PM
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happy endings are best of course..
but i like any, final reports on
any problem expressed here..
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post #58 of 59 Old 08-24-2015, 09:28 AM
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Hi Giko....found your thread very interesting, because my bike is suffering from almost the exact same symptoms as you were suffering from. Would like to do a compression check but my compression gauge has 2 adapters with it and neither one is even close to the proper size, so just wondering where you got the proper size adapter for the cbr250 spark plug hole. Also where did you get most of your new engine parts? Local or mail order. I live in Lower Sackville, so any information you can give me would be very helpful if the parts were sourced locally. And any chance you can give me a ball park figure on the cost of your rebuilt.........
Thanks in advance from a fellow Bluenoser.....
Aaron
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post #59 of 59 Old 09-20-2015, 09:56 PM Thread Starter
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BTW
The engine is still running well. Last June I rode the bike from Halifax to Toronto through New England 1850km. Epic ride, way better than Trans Canada Hwy. Last 400km were WOT for 4 hours (just a petro break).
shisoshin and kiwi rider like this.

Last edited by Giko; 09-20-2015 at 10:07 PM.
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