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Valve adjusting headaches

exdirtbiker

exdirtbiker

Forum Mentor
New-to-me 1980 GS1000G. ( The Beast)
The bike didn't run nearly as good as I thought it should, so I'm cleaning the RS36 carbs, and checking vale clearance.
My headache is:
A): intake 1 and 2 @ .005" and .006"
Ex 1 at .002", ex 2 @ .007"
I've never heard of the clearance so far out of spec, so I stopped where I was, for fear of "I must be doing something wrong". Could carbon buildup be the culprit? The plugs are really fouled. { well, 3 of 'em. :mad: }See pic below.
B): the #1 in and ex buckets are floating in "very old" looking oil, and all other buckets have a nice coating of clean, new oil. I changed the oil before last ride (20 miles, also my first ride on this bike.) I can understand the puddles, esp. since it's the kickstand side, but why is it so old/dirty after a 20 mile ride?


 
Dirty oil: maybe sludge in the oil pan contaminating the oil?

Sooty spark plugs: rich mixture?

Valve clearances: someone didn't adjust the shims properly?
 
This bike was sitting for awhile, yeah?

It just looks to me like the PO (or his mechanic) didn't know what they were doing. Get the proper shims (keep those old ones), clean the carbs, seal up the air/fuel intake path, and you should be good. Barring any carb tuning, of course, since it sounds like your setup is not stock.

Not sure about the oil, it might be that some of the old oil just hasn't worked its way out of the head yet.

Probably want to treat her to a new set of spark plugs as well, they will be easier to read as you go about tuning and plug chops and whatnot.
 
Nessism said:
Dirty oil: maybe sludge in the oil pan contaminating the oil? Only on 2 lifters? The others have a light coat of "clean" oil, and are not "under water"

Sooty spark plugs: rich mixture? I think the P.O. fiddled with the carbs without a clue, and there was a 90 deg kink in the fuel line.

Valve clearances: someone didn't adjust the shims properly?
Click to expand...

I'm hoping it's that simple... Thanks :)
 
Last edited:
eil said:
This bike was sitting for awhile, yeah? No more than a month, I think.

..., seal up the air/fuel intake path.. Already ordering intake O-rings from Mr Barr


Probably want to treat her to a new set of spark plugs ...
Click to expand...

spares are on the shelf :)
 
Just for the record, I got 3 guys helping me within 10 minutes of posting my problem.
I LOVE THIS FORUM !
Thank You !
 
TeamDar said:
If those are indeed Web cams then the clearance should be .004"- .006".
Click to expand...
I was going to guess that maybe the last 'mechanic' was confusing INCH and METRIC numbers and was shooting for 0.003 to 0.008". :o

I had not noticed the "Web cams" reference in his sig. Good catch.
icon_thumbsup.gif


.
 
TeamDar said:
If those are indeed Web cams then the clearance should be .004"- .006".
Click to expand...

Really ? Thanks ! I had a hunch they needed different clearance, but couldn't find it in writing, so I stopped thinking about it.
The readings I got make a lot more sense now.
( again, see my previous posting ! )

Awful nice of Web to put the info on the end where you can see it...

 
And seeing how these are dated "9 94", I'm starting to realize the P.O. did NO maintenance at all. And rode the %^&* outta it for 20 years.
 
TeamDar said:
Here is the spec sheet:
http://www.webcamshafts.com/pages/motorcycle/suzuki/install_data/tc_000465_000663.html
Click to expand...

Thanks again TeamDar !
The sheet says " vale lash .006" not .004-.006.
should I go .005 -.007 ?

Intake
Exhaust
Valve Lash (Inch):
.006"
.006"

Valve Lift (Inch):
0.365
0.365
Valve Lift (mm):
9.27
9.27
Advertised Duration:
286?
286?
Duration @ 0.050":
245?
245?
Lobe Center:
105?
105?

Intake
Opens
17.5?
Before
TDC
Exhaust
Opens
47.5?
Before
BDC
Intake
Closes
47.5?
After
BDC
Exhaust
Closes
17.5?
After
TDC
Valve Timing Is Checked With Zero Valve Lash
@ 0.050 Inches Of Valve Lift.
Print Timing Card Information
Close Timing Card Information
Web Cam Inc. products are not intended for use on pollution controlled vehicles.
Copyright ? 2000 - 2014, Web Cam Inc. ?, All rights reserved.
Open Monday - Friday, 8:00am - 4:30pm Pacific
 
TeamDar said:
I would shoot for .006" but I wouldn't go any larger. How about .005"-.006"?
Click to expand...
Since the shims come in increments of 0.05mm (approx 0.002"), he will need to have a 0.002" range.

Which would be better, 0.005-0.007" or 0.004-0.006"?

.
 
How about .004"-.006" intake and .005"-.007" exhaust. These are mild cams that can use stock valve springs. Dar
 
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