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Charlie, From reading stuff it sounded like the Lario's were the ones that had more issues with valves shearing off. I read something about the 2 valve heads having occasionally issues with exhaust valve shafts lengthening and eventually failing. That did not sound like a very spontaneous event on the 2 valve heads. Did I misunderstand things? Also the parts support on those 80's small blocks seems poor (did not realize this when I got the bike). I do not want to replace the stock valve with an aftermarket part that may have even less of a lifespan / track record. Did you swap out both (intake and exhaust) valves? What product did you use?
There had been good riding weather during the last couple of weeks, so not much happened on the Guzzi. I did nevertheless remove the intake and the exhaust valve from the cylinder head. Seats looked good and there were no other surprises. The exhaust valve did not show any signs of bulging on the shaft. I will replace it preventively anyways. Which is where things get difficult. MGcycle is out of stock on most of the stuff I would need. In my desperation I have checked the local Moto Guzzi dealer's website. The V65 is calling for an exhaust valve with part number GU19036183 (30.5mm). A Nevada (or Breva or V7II for that matter) calls for a exhaust valve that goes by part number GU20036120. The website shows it to be 30.5 mm as well. The halve cones holding the valve in place are interchangeable between Nevada and v65 (identical part number). Can I use GU20036120 (Nevada valve)?Also, the Nevada valve spring I have found is GU27037521. Is that the spring everyone is using in replacement of the V65 big and small combo spring arrangement? Thanks, Patrick
There are 2 ways of upgrading the valve train 1) replacing both springs for inlets and exhausts with the post 90's set up 2) using a single spring system from the 750 NevadaThanks!
My bike has 13,000 miles and after checking it still has double valve springs. I suppose if Im going to keep it I should be looking at new valves in the future.
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