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April 21st, 2016, 03:23 PM   #31
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Thanks for the advice - I'll have a look in there at the weekend. Looking back - they were nipped up tight when I first undid them to adjust...
How quickly can they work themselves loose? I had it running less than 2 minutes. for future reference, how much is everyone torquing them up to?
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April 25th, 2016, 07:45 AM   #32
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The auto decomp is definitely the culprit - broken up. The real worry here is that there is no sign of the retaining bolt or nut.......









I never touched any of this (though obviously should have....), and unfortunately have no idea if the retaining bolt was there when I adjusted the valve clearances. I'm assuming it can't have been left out by a previous owner otherwise this would surely have happened earlier?

By the way - shouldn't that camshaft bearing in pic 2 be rubber sealed? I know that's the least of my worries
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April 25th, 2016, 04:26 PM   #33
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i can't see your pics (and don't have photobucket account), so i have to guess you mean the stop bolt for the autodecomp is gone. some people remove the stop bolt to keep it from falling out and causing a problem.
as far as the cam bearings are concerned, some people replaced them with open bearings. AND sometimes it's the bearing that disintegrates and knocks the seal off when one or more of the balls escapes and causes a problem. look closely at them. i believe they have 9 balls.
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April 25th, 2016, 10:52 PM   #34
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Thanks Ned - that goes some way to easing my mind! Everything else is accounted for I think - the main bulk of the auto decomp that broke off and popped the hole in the rocker cover, part of the auto decomp left on the cam shaft, and some small shards/debris at the bottom of the casing. I didn't realise it could be run without the stop bolt, so hopefully that's the case here - there's definitely no sign of it.
I'll have a good look at that bearing. Both will now be replaced anyway I guess, along with new auto decomp + chain.
Cheers.
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April 26th, 2016, 12:48 AM   #35
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7 Ned! you might have lost a pair of balls though!

7 balls in the cam bearings.

LOL!!!

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April 26th, 2016, 07:26 AM   #36
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i knew it was an odd number, taf. i'm lucky that i can still remember that much.
never hurts to have extra balls!
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June 16th, 2016, 11:18 AM   #37
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Quick update - though nothing has really happened yet! Work/holidays/general stuff has got in the way of things lately. Just now got around to getting the engine out, so will now try to find the time (and space on a bench) to have a go at this.
All 7 balls are present in the bearing, and no traces of shredded seal, so looks like someone HAS replaced it with an open bearing. With that in mind - and the fact that the stop bolt is (seems to be) completely absent - what would have caused the auto decomp to break up?
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June 6th, 2017, 01:54 PM   #38
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Update - Finally getting around to sorting this broken decomp issue. I will be putting the stop bolt back in!! Seems this engine has had some work -
Has HCDI No. 15 on the camshaft, which I believe is a stage 2 Hotcam for a KTM RFS (with the end of the shaft cut off).



Looks like a high comp piston - no markings visible to check -




Some porting has been done, though not visible in this pic due to the black crud build up - normal or excessive??






Hopefully get this back together and running soon....
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June 6th, 2017, 07:55 PM   #39
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June 6th, 2017, 11:12 PM   #40
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What is the exhaust valve to piston clearance ?
Might be good to check it with clay as the Piston looks a bit odd and we don't know if that happened earlier when the valve timing was out or not
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Last edited by bushmechanic; June 6th, 2017 at 11:20 PM.
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