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Re: valve train problem

Posted: Sat Jul 31, 2021 9:25 pm
by SteveD
How often do we read of VSR in the pre 80 bikes? That's pretty rare isn't it? All 4 valves closing is also rare.

Has something been forgotten during reassembly that affects all valves?

At those miles it'll be an interesting resolution as the symptoms aren't "typical" for the bike.

Re: valve train problem

Posted: Sun Aug 01, 2021 10:33 am
by melville
Yes, all four closing is rare. I just looked through my logbook on Ernst (where the pictured heads came from) and the right exhaust closed up before one check and then they both closed up on the next check. Toward the end, they'd close up simultaneously in 400 miles, which made for a bit of an adventure as I was on a 2000 mile trip. This was a 3 AM valve adjustment in Ely Nevada:

Image

The intakes were also losing clearance toward the end, but not as quickly as the exhausts.