Broken Barrel

hassbeen
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hassbeen
Edited Date/Time 5/6/2017 3:32pm
Anybody experienced this? I've see 4T's blowing up like this , but not a 2T. This is a YZ 250 2012.


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hassbeen
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hassbeen 5/3/2017 6:57am
5/3/2017 6:57am
hassbeen wrote:
Anybody experienced this? I've see 4T's blowing up like this , but not a 2T. This is a YZ 250 2012. [img]https://p.vitalmx.com/photos/forums/2017/05/03/192340/s1200_Barrel.jpg[/img]
Anybody experienced this? I've see 4T's blowing up like this , but not a 2T. This is a YZ 250 2012.




xnationalwrench 5/3/2017 7:23am
5/3/2017 7:23am
Any idea on how many hours on this bike? When was the top end rebuilt and were everything in spec (clearence). Did anybody port this cylinder?
McDuff
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McDuff 5/3/2017 7:24am
5/3/2017 7:24am
I had that happen once, also a yammie 2 stroke. Not nearly that bad, cracked around one mounting bolts, still had to replace. I've never seen anything like that one.
BobPA
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BobPA 5/3/2017 7:40am
5/3/2017 7:40am
Big time head gasket leak will cause it to hydrolock and cause that. I have seen it many times with jet skis.

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Bruneval
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Bruneval 5/3/2017 11:12am
5/3/2017 11:12am
That's a good one! Water doesn't compress and had to go somewhere - hopefully the cases are okay.
Paw Paw 271
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Paw Paw 271 5/3/2017 11:59am
5/3/2017 11:59am
BobPA wrote:
Big time head gasket leak will cause it to hydrolock and cause that. I have seen it many times with jet skis.
X2

Paw Paw
Knoby
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Knoby 5/3/2017 5:13pm
5/3/2017 5:13pm Edited Date/Time 5/3/2017 5:17pm
Premix ratio + coolant leak = piston hole. Even the lower a/f ratio can melt a hole if rich enough.
omalley
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omalley 5/3/2017 9:02pm
5/3/2017 9:02pm
Nitrous backfire? Lol...
hassbeen
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hassbeen 5/4/2017 3:51am
5/4/2017 3:51am
Bought 2nd hand so don't know the history on rebuilds etc. Compression was fine so I suspect not too many hours on it. Still had original tires as new.
Anyway thanks for all the advise. Will be splitting the casing this week will post more later.

hassbeen
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hassbeen 5/4/2017 3:52am
5/4/2017 3:52am
mjr119 wrote:
Almost as bad as this.... [img]https://p.vitalmx.com/photos/forums/2017/05/03/192459/s1200_IMG_2986.jpg[/img]
Almost as bad as this....



Ouch that's worse, I'm hoping to at least save the casings. LOL
rmoto003
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rmoto003 5/6/2017 3:32pm
5/6/2017 3:32pm
You had the wrong powerband installed
hassbeen
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hassbeen 5/7/2017 11:30pm
5/7/2017 11:30pm
rmoto003 wrote:
You had the wrong powerband installed
LOL was actually attempting to combine engine braking with hole shot device.Laughing

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