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  1. S

    Valve rotation

    Maybe not. I could see it as one of those factors that, strictly speaking, is proper engineering, but real-world is not that big of a deal. And I’m actually wondering if it mattered more with leaded gas. Back then, we were constantly building up deposits on the seats, and rotation would help...
  2. S

    GTM 2>1 left side exhaust

    That is one of the most drool-inducing dyno runs I've seen. Conventional wisdom, certainly at least for twins, is that a radically shorter 2-1 system would probably give top end gains, but suffer in the mid-low rpm range, no? But, damn, from 3K right on up it's all gravy right there. I'm amazed...
  3. S

    Valve rotation

    This one didn't. (From my 1975 850T) I never heard a comment like that 5000rpm idea. What exactly is stopping it from rotating at 4500? Some valve brands have keepers that grip the stem, so no rotation. But I think it's well established that rotating is a good thing, no? The valves on BMW...
  4. S

    New to forum, and to Moto Guzzi—1975 850T refresh

    Yeah, some aspects of this bike look like 11K, and some others make me wonder as well. The friction plates look fine. A little under 7.5mm, so I will replace them. The springs are below spec as well. The pressure plates and intermediate plate all look fine. No evidence of any incident, and they...
  5. S

    New to forum, and to Moto Guzzi—1975 850T refresh

    Another little discovery. Pretty deep gouges in the flywheel. Interferes quite a bit with the clutch plates. How would this happen? And is it common? I will de-burr these, of course.
  6. S

    New to forum, and to Moto Guzzi—1975 850T refresh

    I checked my odometer today, and it works, so I’ve only got 11,000 miles. I like the sound of that diagnostic—if the chrome isn’t evident in the rod bearings, it’s probably not lurking anywhere else. On the other hand, if it’s embeded in the crank bearings... I haven’t yet researched how much...
  7. S

    New to forum, and to Moto Guzzi—1975 850T refresh

    The pan had only fine slime/sludge—no discernible metal bits one could feel. I cut open the filter and washed the paper in mineral spirits. This is all that came out. About 1/4 of that came up on a magnet. There is nothing obviously “metallic” about the remaining grit. If I didn’t know anything...
  8. S

    New to forum, and to Moto Guzzi—1975 850T refresh

    Well, thanks, Ambo. I do have an oil filter, but I don't imagine that changes the equation all that much as to needing to tear it down. Or does it? (Being irrationally hopeful.) Well, I wanted a winter project...
  9. S

    New to forum, and to Moto Guzzi—1975 850T refresh

    Thank you John, very good to start getting the fine details of Guzzi engines. One more thing I noticed was wear on the valve stems. Not major, I think. However, I know that BMW designs their valve keepers to allow the valve to spin, and even the wear pattern out. Am I seeing typical wear for a...
  10. S

    New to forum, and to Moto Guzzi—1975 850T refresh

    Hello. New here, and starting a 1975 850T project. I am very experienced with 1970s BMWs, but this is my first Moto Guzzi. I have always wanted one. This one has been sitting a long time, so I will be going through it fairly thoroughly. But, it’s mileage is pretty low (not sure if the odometer...
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