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Old 03-13-2012, 09:44 AM   #1
pkboxer OP
Joined: Jun 2011
Location: cincinnatus oh
Oddometer: 95
Eh? Symptom of a pulled stud

I got this comment on another forum when asking about how much the valve lash would/could close up after an initial 35 mile ride after installing a redone head. ('73 R90/6)

To find that the valves had closed up to near zero would alarm us greatly. Either we failed to assemble it correctly, or a stud is pulling out.
When a stud is pulling out of the case, doesn't the torque go down, and allow the whole assembly to move away from the block a bit and therefore, make the valve lash larger.

Not smaller?

Pulling a stud is right on my top list of things I don't want to happen to the bike, and then I get this "the sky is falling" statement.....
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Old 03-13-2012, 12:22 PM   #2
Along for the ride
RecycledRS's Avatar
Joined: Nov 2008
Location: Vancouver Island
Oddometer: 1,040
You are right that the valve lash would open up but I'm not sure you would see it until much later (or head leak). Best to check the head bolt torque when setting valves, although some warn against this as it can lead to over torquing after a number of times.
"There's a fine line between a shearing and a skinning"
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Old 03-13-2012, 06:03 PM   #3
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Joined: Feb 2007
Oddometer: 11
pulled stud

I had six of the head bolts strip on my 81 GS. The symptoms were increased valve clearance. With some creative use of JB weld and heliocoils, Matt Parkhouse was able to get things to stay in place.
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