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Valve adjustment '81 GS650G

  • Thread starter Thread starter Clint
  • Start date Start date
Although valve clearance is an important maintenance item, the vibration you are speaking of is more directly affected by the carb synchronization (balance). My GS650G valve clearances were way too tight before adjustment. After setting the valve clearance, I found that startability and idle stability were much improved, but there was almost no effect on the 5000~6000rpm vibration.

Just last week I finally recieved my carbtune and balanced the carbs (took me a year to get started). After the sync, my vibration was reduced in half. It still vibrates, but my right hand doesn't go numb nearly as quickly as before. Originally, I had about 10~15 min at 60~70mph before the numbness set in. Now I can go for over 30min with minor numbness.

It's not perfect by any means, but much better after the sync.

The other thing that helps greatly is having a set of stock handlebars with the lead mass damper weights inside the bars. I've tried a barsnake with aftermarket bars and it was no where near as good as the stock bars (currrently using 850G bars, same as 650G by my understanding.
 
duaneage said:
And document what shims and clearances you end up with on each valve and cylinder. The next time you do a valve adjustment in 7500 miles you will already know what is in there and can plan accordingly.
Click to expand...
Duane, have you not used the spreadsheet I sent you over a year ago? :eek:
That is exactly what it does, it documents shims and clearances for reference at a later time. As a bonus, it helps determine whether you need to change the shims based on current measurements, and even goes so far as to suggest the new shim size.

As a bonus feature, there is also a service log sheet on its own page where you can record anything you do to the bike.
Makes it easy to see when you changed the oil, tires, brakes, anything else you choose to enter. :D
 
Steve said:
Duane, have you not used the spreadsheet I sent you over a year ago? :eek:
That is exactly what it does, it documents shims and clearances for reference at a later time. As a bonus, it helps determine whether you need to change the shims based on current measurements, and even goes so far as to suggest the new shim size.

As a bonus feature, there is also a service log sheet on its own page where you can record anything you do to the bike.
Makes it easy to see when you changed the oil, tires, brakes, anything else you choose to enter. :D
Click to expand...

Yes, he can use that too.
 
what is carbtune and colortune? And anyone have a pattern for a shim tool?
 
Steve said:
As a bonus feature, there is also a service log sheet on its own page where you can record anything you do to the bike.
Makes it easy to see when you changed the oil, tires, brakes, anything else you choose to enter. :D
Click to expand...


Reallllly. I need to find my excel doc.
 
crapwacker said:
what is carbtune and colortune? And anyone have a pattern for a shim tool?
Click to expand...

Try this, but you need to be a pretty handy machinist and read German. Probably easier to buy one or use the zip tie method.


Sorry about the quality.
 
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