2014 EC250R broken head :( Cause Unknown

[nknudsen]

Was the head the fuse or did the rod get bent?

[memphis2857]

If the rod would have been bent it would have busted the bottom of the cylinder. A bent rod would not have the reach to take out the very top of the head. That is the direct result of trying to bump start a bike that is being towed that has a cylinder full of water


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[twowheels]

Full of water is right, but it's not even that much. (F5) or Jake can likely give the number to the third decimal but your available volume is only on the order of 20cc or so before the incompressibility of the fluid faces off with the ductility of the casting.

[Jakobi]

Depending on the capacity of the engine, and the squish clearance, and compression ratio, the trapped volume will vary a bit from bike to bike but like Steve said, its doesn't take a whole lot of fluid to cause issues.

Turning over slowly you'll have a better chance of potentially pushing excess fluid out the exhaust port (depending on the position of the piston), and will feel it get tight before damage is done. Banging on the electric start is a good way to cause issues, and in the case here may have caused some initial damage and then pumped itself out while being towed, however each cycle was still compressing air. Only a matter of time before it let go.

On the bright side.. At least you already had the tow rig setup.

[Jakobi]

I've seen my bike shoot a jet of water out the plug hole about 3M in the air Definitely works out quicker and easier to pick up on the clues and dewater initially than to try and just do the cheeky. Hope you source some parts for reasonable prices.

[blamir]

Pipe was not under water. It is a bit deep but not too much. It was a short river. How can bike intake so much water . I do not know what is the all damage . I hope only in head.

Thanks.

[Neil E.]

The air box will take in water before the pipe ever does. Since air passes through the filter, water will too. The only thing that helps is to use a petroleum based filter oil. It will resist light splashing better than an alcohol based filter oil. Any heavy splashing will go through either type. Plan on dewatering any time the water level reaches the bottom of your air box. A little dip in the stream bottom can cause water to enter quickly. You are often paying attention to slimy rocks and don't notice the depth change as you bounce along. Any time you stall the engine when water is higher than the top of your tires, check for water in the airbox (or engine) when the bike is pulled out.

The multi-piece construction of modern airboxes is not suitable for significant water crossings. The old one-piece molded airboxes were much better, but you could easily drown them too. I remember pictures of the Blackwater Enduro where many bikes were equipped with snorkels.

[Jakobi]

Giving it a big handful of revs also increases the sucking effect at the filter and makes it much easier to pull water through the filter into the engine.

I've gone through pleanty of deep water without any issues. I've also seen them take on water. At least 2 ktms have been rebuilt in the last 12 months here due to taking in dirty water.

My advice re the engine now is fully pull it down. Do the job right the first time.

[blamir]

Last video before wreck the bike

http://www.youtube.com/watch?v=4q3ielOi9-U

[blamir]

Bike is ready to ride. Only head damaged, changed and it goes like a charm.