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Old June 1st, 2013, 06:04 PM   #31
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Conrod end caps don't "fall off" - they are pulled off by a descending crank pin which the piston (for whatever reason) doesn't follow.
Difficult to diagnose once the engine has blown, but this is generally caused by a resistance in the piston/cylinder, where the crank keeps rotating, and something has to give.
A sad tale either way. You have our sympathy.
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Old June 2nd, 2013, 06:44 AM   #32
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Pat, I have seen quite a few rod caps part company with the conrod after the bearing has spun from lack of clearance or oil starvation. In each case the piston and bore was all normal (except for scratches from bearing debris that gets thrown into the bore) with no signs of seizure. The massive clearance created by the collapsed bearing seems to shock load the bolts and they break, letting happen exactly what the OP described. It's always ugly and expensive unfortunately.
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Old June 2nd, 2013, 12:00 PM   #33
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Is the dealer refunding the purchase?
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Old June 2nd, 2013, 04:59 PM   #34
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Pat, I have seen quite a few rod caps part company with the conrod after the bearing has spun from lack of clearance or oil starvation. In each case the piston and bore was all normal (except for scratches from bearing debris that gets thrown into the bore) with no signs of seizure. The massive clearance created by the collapsed bearing seems to shock load the bolts and they break, letting happen exactly what the OP described. It's always ugly and expensive unfortunately.
Yes, if the actual bearing grabs and spins within the rod-end that will force it apart also.
The point I was making is that the bearing caps don't "come undone" - they are forced apart by another failure.
And yes - not pretty.
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Old June 2nd, 2013, 06:21 PM   #35
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Is the dealer refunding the purchase?
They damn well better!
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Old June 2nd, 2013, 07:17 PM   #36
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Is the dealer refunding the purchase?
yeah they ended up just swapping the 1098 with an 2010 mv agusta f4 with a 2 year warranty. its not a duc but its still a fun bike! now to fix up the 848 for the races!
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Old June 3rd, 2013, 04:09 AM   #37
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Well that sounds like a happy ending.

Good one.
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Old June 3rd, 2013, 09:01 AM   #38
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Well that sounds like a happy ending.

Good one.
More like the asian massage parlors happy endings.
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Old June 9th, 2013, 07:02 PM   #39
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