Valve adjustment '81 GS650G

[scrapper]

oh ok

[wrgum]

Regarding the initial post on this thread, I'm curious as to whether anyone knows whether one of the RealGaskets breather gaskets will fit on an '81 GS650G? Anyone know? Thanks!

wrgum

[BassCliff]

Hi Mr. Clint,

The OEM part# 11177-47001 listed on the RealGaskets site for the 550 breather gasket (RG-SBC-1) is the same Suzuki part number for the breather gasket on the '81 GS650. That means it should fit.

Feel free to check my valve clearance guide on my little BikeCliff website. It should answer most of your questions. I wouldn't order a whole shim kit. There will be too many sizes in there that you'll never use (the bigger sizes). I suggest taking an inventory of your existing shim sizes and clearances. Then you can order what you need for this and future valve clearance adjustments. Get a metric feeler gauge and a digital caliper. Don't worry if the feeler gauge goes down to only .04mm. When that one doesn't fit, I always change the shim anyway. It's better a little too loose than a little too tight.

Thank you for your indulgence,

BassCliff

[Steve]

Also, search valve clearance and a fellow by the name of "steve" will appear in one of the threads. He offers an excel chart that is invaluable when swapping your shims. I believe Basscliff's site has links to all of this.

You can also save the search and wait for that "Steve" guy to show up in this thread.

Just click on my name, look for the e-mail address info, send me a request for the spreadsheet.

.

[duaneage]

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. The exhaust side tend to get tighter due to valve face and seat wear. Deposits can build up on the intake side and make the gap bigger but that is uncommon.

I found the inner cylinders changed the most, probably from heat sitting in traffic. Your Mileage Will Vary.

It took me longer to clean the gasket surfaces off then it did to shim the engine. I also have some leaks at the rubber half moon caps, I would replace them. Next time I'm in there new rubber caps are going in.

[buddha]

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.

[Steve]

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.

Duane, have you not used the spreadsheet I sent you over a year ago?
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.

[duaneage]

Duane, have you not used the spreadsheet I sent you over a year ago?
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.

Yes, he can use that too.

[crapwacker]

what is carbtune and colortune? And anyone have a pattern for a shim tool?

[maro]

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.

Reallllly. I need to find my excel doc.

[Suzuki_Don]

what is carbtune and colortune? And anyone have a pattern for a shim tool?

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.

[BassCliff]

what is carbtune and colortune? And anyone have a pattern for a shim tool?

Morgan Carbtune

Morgan Colortune

Click and learn.

Here's the tappet tool at Z1 Enterprises. Click the picture to go to their webpage.



Thank you for your indulgence,

BassCliff