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Old 08-24-2013, 02:31 PM   #16
Cpt. Ron OP
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Originally Posted by nomad guy View Post
What would be the reason for that ? was this cylinder (i am assuming that both those valves are of the same cylinder) off timing at any point?
No, not that I am aware of. And if it was, it would stand to reason that both of the valves on the mis-timed camshaft would have issues.
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Old 08-24-2013, 05:48 PM   #17
renogeorge
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I don't have an answer but can guess along with the rest. I just adjusted clearance on my 990--removed cams, replaced shims, blah blah. Did not pull head remove valves as you did. Measured clearances were right at the target for the the new shims--no surprise there.

I can only speculate that dis assembling the head could move things around enough to impact clearance when assembled. Seats are super hard--doubful you changed anything there. Valves--maybe if you really worked hard at the lapping. My guess goes to the valve springs, retainers and keepers--enough metal-to-metal with certain rotation to possibly change the fit and overall height. Machining of these parts along with the spring seating surface could all change the overall height of the valve stem and therefore the clearance once the shim and cam are installed.

Note to self--when taking head apart, always adjust valves after reassembly.

FWIW...If anything
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Old 08-25-2013, 08:51 AM   #18
Cpt. Ron OP
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Well, the leak down test did not indicate anything wrong with any of the valves, let alone the one I'm concerned with. So, I'm going to run with it. I re-shimmed it to the larger end of the range, put the minimum parts back on the bike and let 'er rip. It started and sounded sweet after the cam chain tensioners pressurized. It's been too long.

So the bike will get buttoned up today and taken for a test spin. After some run-in, I'll probably go back in to check the valve lash later this fall.
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Old 11-14-2013, 02:06 PM   #19
jwalters
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Originally Posted by Cpt. Ron View Post
Well, the leak down test did not indicate anything wrong with any of the valves, let alone the one I'm concerned with. So, I'm going to run with it. I re-shimmed it to the larger end of the range, put the minimum parts back on the bike and let 'er rip. It started and sounded sweet after the cam chain tensioners pressurized. It's been too long.

So the bike will get buttoned up today and taken for a test spin. After some run-in, I'll probably go back in to check the valve lash later this fall.
Any update?

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Old 11-14-2013, 02:50 PM   #20
Cpt. Ron OP
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It runs like a raped ape. After checking the valve lash a couple of times just to be sure, I gave up trying to find a problem.
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Old 11-14-2013, 03:07 PM   #21
jwalters
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It runs like a raped ape. After checking the valve lash a couple of times just to be sure, I gave up trying to find a problem.
Excellent! Glad to hear it's back on the road!

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