General Category > Bike Builds, Rebuilds And Restorations Only
1984 Moto Guzzi V65
huub:
if you have the heads off , the minimum is to replace the exhaust valves , and the valve springs.
in 1990 the smallblocks got upgraded valve springs, to stop the occasional dropped valves
these progressive wound springs are a easy swap into older engines
i used to run a hotted up 650 off roader, i changed the exhaust valves at regular intervals as a precaution,
with the upraded (actually 30% softer) springs the valve train is ok.
Mandello Cafe:
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
Antietam Classic Cycle:
--- Quote from: Mandello Cafe on January 19, 2020, 09:00:24 PM ---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
--- End quote ---
Both valves are in stock at Stein-Dinse:
https://www.stein-dinse.biz/product_info.php?products_id=464630
https://www.stein-dinse.biz/product_info.php?products_id=464631
Yes, 27037521/GU27037521 is the spring I used and linked to above.
Skiwi39:
Hi All - I'm new to bikes and bike ownership having just acquired a 1984 V65SP.
I've read the topic from top to bottom, and was aware that valves in these small blocks could be a bit iffy, but wanted to clarify the following:
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 Nevada
Thanks!
Antietam Classic Cycle:
--- Quote from: Skiwi39 on July 22, 2021, 11:53:30 PM ---
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 Nevada
Thanks!
--- End quote ---
Are those both the same thing- single springs?
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