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November 22nd, 2018, 09:49 AM   #1
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Le crap-ola :/

Engine out and its not exactly hard to see whats wrong
Its rebuild time and donor cases are on the operating table already

Thanks from steve and paolo6
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November 22nd, 2018, 10:39 AM   #2
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What caused this failure?
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November 22nd, 2018, 11:23 AM   #3
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Originally Posted by eeazye View Post
What caused this failure?
Oh good question, I have no idea and nothing in particular ever happened to it.
Well unless you consider 150 hrs of ice riding being a problem, that is.
Its quite abusive and Id reckon some parts will take more abuse than from woods riding, but cracked cases I wouldnt think of.
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November 22nd, 2018, 01:19 PM   #4
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Interesting place to crack. The front sprocket rotates forward and the engine want to counter backwards, the swing arm mount and top mount stops it but the engine flexes between them? Or do you think this comes from the crank? Fatigue from vibrations?
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November 22nd, 2018, 06:10 PM   #5
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Thats the balance shaft line.
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November 22nd, 2018, 07:19 PM   #6
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Gorilla tape very strong they said. But seriously, this could be welded I think. So don't throw them away.
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November 22nd, 2018, 11:17 PM   #7
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Its prob split where the balance shaft runs all the way to what’s visible outside.
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November 23rd, 2018, 02:51 AM   #8
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Very interesting! Thanks for posting! – Did it have a stock rotating assembly?

I also wonder if 530 EXC-R cases crack in a similar way. – Edit: Just checked, and a good honest online search didn't reveal anything.

Last edited by tourist; November 23rd, 2018 at 05:11 AM.
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November 24th, 2018, 11:39 AM   #9
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Im wondering whether you had a clearence issue with the counter balancer!
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November 26th, 2018, 06:46 AM   #10
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No idea at this point, well see when it comes apart.

Originally Posted by Alan View Post
Im wondering whether you had a clearence issue with the counter balancer!
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