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550K1 - intake valve rocker arm issue on cyl#1?

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Trigger:
This can happen for few reasons. I have found this many times due to :

Aftermarket tappet cover. Swap with another cover on the bike and see if it still does it.
Tappet cover over tightened with old 0 ring. New 0 ring and don't over tighten.
Worn rocker
Worn cam shaft
Tappet chipped 

Bryanj:
Could also be hardening gone on tip of valve so it indents and you have to screw adjuster father in, short valve stem on pattern valve.
Those would not cause hitting of cap but that is problably pattern cap not quite right, seen a few of those.
If all parts original most likely cause is cam lobe/rocker pad wear

Erny:

--- Quote from: Oddjob on August 22, 2020, 11:41:12 PM ---Won't know until you investigate but aside from time it doesn't really cost much to whip the camcover off.

--- End quote ---
I suppose removal of camcover can be done with engine in frame, right?

Erny:

--- Quote from: Trigger on August 23, 2020, 08:25:32 AM ---This can happen for few reasons. I have found this many times due to :

Aftermarket tappet cover. Swap with another cover on the bike and see if it still does it.
Tappet cover over tightened with old 0 ring. New 0 ring and don't over tighten.
Worn rocker
Worn cam shaft
Tappet chipped

--- End quote ---
I don't think it is aftermarket cap. Just checked now all other tappets and confirmed that only screw on intake cyl#1 is deeply screwed in like that.

New O ring would help just little in this case (yes, O rings are old, most probably stock)

As engine "eats" oil too (but no visible smoke from pipes), I'm afraid that engine rebuild is in front of me anyway (winter project)

Bryanj:
Yes you can take rocker cover off in frame, and all way down to base gasket as well.
READ CAREFULLY all the warnings on this site and in manual about refitting cam cover

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