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With only 3k after the rebuild, what do you think caused this?
My R90's got about 30 miles after a lead-free rebuild with Black Diamond valves, too.
30 miles? That's it?
Is Black Diamond not the way to go?
No no no.. I don't want to start any rumors.
I mean, I just rebuilt my heads, and I was wondering if the same thing might happen to me, given _________. I was wondering if someone could fill in the blank.
I've not heard much good regarding after market valves. BMW valves should be the first consideration if you really want to get the life out of them. This was hashed quite a bit over on the Airheads listserve.
I've not heard much good regarding after market valves. BMW valves should be the first consideration if you really want to get the life out of them. This was hashed quite a bit over on the Airheads listserve.
Bob's BMW literature claims the Black Diamond is better than BMW factory.
My comment as a metallurgist--embeded material on the valve stem from the guide is not a good thing. Suggests either the guide to stem clearance was wrong or the choice of materials for guide and stem was not compatible.