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July 6th, 2017, 03:27 PM   #1
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70 degree motor goes out with a bang

And I mean a bang, like a shotgun going off.






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Last edited by berglsmerg; July 6th, 2017 at 03:47 PM.
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July 6th, 2017, 03:39 PM   #2
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Sorry to see this. Initial thoughts on the cause?

I've been babying my 2011 FS570 this year hoping to avoid anything catastrophic like that.
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July 6th, 2017, 03:46 PM   #3
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The exhaust valve head in the first pic gives it away. I run an fairly radical cam profile on the standard valve springs, it was only a matter of time before it went bang. I don't think you need to baby it, the 70 degree engines are incredibly well built and survive on routine maintenance. Had I done a valve lash check before this event I'd have picked up the decreasing clearance and avoided the carnage.
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July 6th, 2017, 04:17 PM   #4
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Noticed the valve head, but thanks for the clarification! I am no mechanic (obviously).

9,500 km and about 140 hours on my 570 now, valves haven't needed to be adjusted yet. However, after seeing these photos I think I'll check them again at my next oil change

Will you be rebuilding? If so, I think it would be pretty cool if you took some photos along the way as you make progress!

Last edited by topgun; July 6th, 2017 at 04:21 PM.
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July 6th, 2017, 04:40 PM   #5
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I have started gathering parts, should be ready to build in a few months time, Ill be sure to photo it up. I should crack test and measure the cases before I start getting too keen on sourcing the parts !
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July 6th, 2017, 05:34 PM   #6
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I had a valve drop on my XC Falcon 3.3L 6 cyl and had to drive about 200km from when she dropped and she only ended making the top of the piston all mashed up, so I had something of a forged top of that piston, went and got another head slapped on it and drove it for 3 months and then turned it into a paddock basher for 6 months flogging and then a mate put it into his car and only then did it start blowing smoke.

But we are talking about a high tec Ford engine here, if only Ford made bikes. ha
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July 7th, 2017, 02:37 AM   #7
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That is a catastrofic for sure!

Will you 610 again?
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July 7th, 2017, 02:03 PM   #8
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Yes I will jon, no doubt about it. The price of a 610 kit outright is very competitive against the price of new genuine parts ! Going with a KTM 530 rod as well to open up options with the 19mm wrist pin.
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July 7th, 2017, 09:59 PM   #9
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that's impressive!
In a bad way
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July 8th, 2017, 02:48 AM   #10
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My plan is also the 530 rod as I will buy a 102mm piston for it.

The upside of a failure is to plan for new parts
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