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Old 08-07-2016, 12:29 PM
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o rings

Anyone know a source for the tiny o rings on the idle mixture screws on the late carbs?
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80 SG Ol' Okie;79 engine & carbs w/pods, 45 pilots, 140 mains, Custom Mac 4 into 2 exhaust, ACCT,XS850 final drive,110/90/19 front tire,TKat fork brace, XS750 140 MPH speedometer, Vetter IV fairing, aftermarket hard bags and trunk, LG high back seat, XJ rear shocks.

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Old 08-07-2016, 01:11 PM
mack mack is offline
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O ring

Yes Greg, go to a susuki dealer and order part # 13295-29900. They are rather dear at $5.49 can each.
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Old 08-07-2016, 01:21 PM
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Thanks mack. found a set of 4 at XJ4Ever for $6.95

Info@xj4ever.com is where to order if anyone's interested. Look up your part and part # in their catalog http://xj4ever.com/catalog/a-catalog-index.html and send an email requesting to order.

Thanks to Stereomind.
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Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.

― Albert Einstein

80 SG Ol' Okie;79 engine & carbs w/pods, 45 pilots, 140 mains, Custom Mac 4 into 2 exhaust, ACCT,XS850 final drive,110/90/19 front tire,TKat fork brace, XS750 140 MPH speedometer, Vetter IV fairing, aftermarket hard bags and trunk, LG high back seat, XJ rear shocks.

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Old 08-07-2016, 03:37 PM
motoman motoman is offline
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Quote:
Originally Posted by mack View Post
Yes Greg, go to a susuki dealer and order part # 13295-29900. They are rather dear at $5.49 can each.
Yup........the Suzuki part numbers is what I used.

Greg, make sure also, that the teeny thrust washers for the O-rings are still in place. If not, that is also a Suzuki part number. Let me know either way, as I have that Suzuki part number also.
Those two parts are, and have been NA from mother Yammy for several yrs. now. Suzuki GS's used same carbs and those two part numbers are still available from Suzuki dealers........least were 5yrs. ago when I replaced those teeny O-rings and the missing teeny thrust washers.
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Old 08-07-2016, 03:47 PM
motoman motoman is offline
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Ahhh.........got both part numbers for ya' Greg!

teeny O-ring part number(4): 13295-29900
teeny thrust washer part number(4): 13291-29900
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Old 08-07-2016, 04:32 PM
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Yeah, Len at XJ4Ever asked if I had all the washers too, I have all of those.

Lost one out of this SG project/sale bike I have. Found another screw and washer but I don't have any more O-rings.

Len just sent me a confirmation email saying a new set will be in the mail in the morning.

Why would 1 carb need the idle mixture screw turned WAYYYYY out to get it to idle right? I changed the screw, the pilot jet, checked float level (clear tube method Brant), even the carb body and it still wanted the screw way out. I assume that's why I lost it.

What else could cause this?
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Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.

― Albert Einstein

80 SG Ol' Okie;79 engine & carbs w/pods, 45 pilots, 140 mains, Custom Mac 4 into 2 exhaust, ACCT,XS850 final drive,110/90/19 front tire,TKat fork brace, XS750 140 MPH speedometer, Vetter IV fairing, aftermarket hard bags and trunk, LG high back seat, XJ rear shocks.

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  #7  
Old 08-07-2016, 06:48 PM
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Quote:
Originally Posted by BA80 View Post
Yeah, Len at XJ4Ever asked if I had all the washers too, I have all of those.

Lost one out of this SG project/sale bike I have. Found another screw and washer but I don't have any more O-rings.

Len just sent me a confirmation email saying a new set will be in the mail in the morning.

Why would 1 carb need the idle mixture screw turned WAYYYYY out to get it to idle right? I changed the screw, the pilot jet, checked float level (clear tube method Brant), even the carb body and it still wanted the screw way out. I assume that's why I lost it.

What else could cause this?
Maybe shaft seals or float level.

Those O-rings are also available, in a pinch, at Harbor Freight.
They sell a viton kit with assorted sizes and the smallest size is the schnizzle and you get like 8 or 10 pcs.
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Old 08-07-2016, 07:17 PM
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Greg, what does a vacuum gauge show?

Vacuum should be close to the same as the other three at the lowered RPM you use for setting the idle mixture screws.

Pilot fuel and air jets and the circuit clean (I know you checked it already).

Valve clearance(s).

Prissy spark plug/wire/boot/resistor, try swapping the leads to check.

A small vacuum leak.

Bad throttle shaft seals letting air in around the shaft instead of fuel from the idle port.

With the engine idle speed turned down, backing the mixture screw out until it clears the port should pretty much allow full flow from the idle circuit and the engine should start to run rich on that cylinder. If that's not happening, opening the screw further doesn't let any more idle mix go through the idle port but it will start letting air in around the threads and lean out the mixture as the o-ring and spring lose compression or the screw falls out....

.
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  #9  
Old 08-07-2016, 07:46 PM
motoman motoman is offline
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Quote:
Originally Posted by BA80 View Post
Yeah, Len at XJ4Ever asked if I had all the washers too, I have all of those.

Lost one out of this SG project/sale bike I have. Found another screw and washer but I don't have any more O-rings.

Len just sent me a confirmation email saying a new set will be in the mail in the morning.

Why would 1 carb need the idle mixture screw turned WAYYYYY out to get it to idle right? I changed the screw, the pilot jet, checked float level (clear tube method Brant), even the carb body and it still wanted the screw way out. I assume that's why I lost it.

What else could cause this?
Had the same scenario on one carb BA80.
Found it to be a split in one of the teeny O-rings, so, without taking any chances of any others not actually sealing like there supposed to, replaced all four. That totally solved any vacuum leak issues, and allowed mixture screw settings on all four within a screwdriver blade thickness of each other.
What it amounts to Greg, is there is a slight vacuum leak created with a faulty teeny o-ring, which forces the idle mixture setting screw to be WAY out to compensate for a previous lean mixture due to a slight vacuum leak from a faulty o-ring.
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Last edited by motoman; 08-07-2016 at 07:52 PM.
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  #10  
Old 08-07-2016, 08:23 PM
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Quote:
Originally Posted by 3Phase View Post
Greg, what does a vacuum gauge show?

Vacuum should be close to the same as the other three at the lowered RPM you use for setting the idle mixture screws.

Pilot fuel and air jets and the circuit clean (I know you checked it already).

Valve clearance(s).

Prissy spark plug/wire/boot/resistor, try swapping the leads to check.

A small vacuum leak.

Bad throttle shaft seals letting air in around the shaft instead of fuel from the idle port.

With the engine idle speed turned down, backing the mixture screw out until it clears the port should pretty much allow full flow from the idle circuit and the engine should start to run rich on that cylinder. If that's not happening, opening the screw further doesn't let any more idle mix go through the idle port but it will start letting air in around the threads and lean out the mixture as the o-ring and spring lose compression or the screw falls out....

.
1; vacuum is the same as the others. Synced up good

2; carbs clean. As I said, I swapped out the carb body thinking there was an issue there.

3; swapped out the head because of a broken exhaust stud. Clearances good.

4; New plugs and resistor ends.....good blue spark.

5; First thing I checked for was a vacuum leak. Sprayed carb cleaner around intake boots and shaft seals. No difference. Boots in very good condition.

I ordered a new set of O-rings and got a couple of unbroken used ones to try from Stereomind when I was at his place a little bit ago.

If I cover the primary air jet just right I can get the idle to smooth out.

I've never had good luck with the late carbs for some reason. Unless, they are on someone ELSES bike.
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Greg

Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.

― Albert Einstein

80 SG Ol' Okie;79 engine & carbs w/pods, 45 pilots, 140 mains, Custom Mac 4 into 2 exhaust, ACCT,XS850 final drive,110/90/19 front tire,TKat fork brace, XS750 140 MPH speedometer, Vetter IV fairing, aftermarket hard bags and trunk, LG high back seat, XJ rear shocks.

The list changes.
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Old 08-07-2016, 08:49 PM
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Quote:
Originally Posted by BA80 View Post
... If I cover the primary air jet just right I can get the idle to smooth out.
So too lean, you try just swapping mixture screws/o-rings? That should've been cleared up when you changed carb bodies around but WTH, until you get new ones try Brant's idea about shake-n-baked o-rings.

Edit: Or stick another set of carbs on and see if it clears up.

Quote:
I've never had good luck with the late carbs for some reason. Unless, they are on someone ELSES bike.
I know my carbs worked great until I got this totally stupid urge to check and reset the idle mixtures. Once I turned the mixture screws the o-rings weren't in their baked-in happy place any more and I eventually ended up buying some new ones from an industrial supply shop down in San Diego. I bought extras too so they're safely tucked away in a bag... somewhere.

Last edited by 3Phase; 08-07-2016 at 08:56 PM. Reason: Hindsight
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Old 08-07-2016, 08:53 PM
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I bought extras too so they're safely tucked away in a bag... somewhere.
I certainly know how that works. I put stuff up so I don't lose it then lose my memory. Can't win.
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Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.

― Albert Einstein

80 SG Ol' Okie;79 engine & carbs w/pods, 45 pilots, 140 mains, Custom Mac 4 into 2 exhaust, ACCT,XS850 final drive,110/90/19 front tire,TKat fork brace, XS750 140 MPH speedometer, Vetter IV fairing, aftermarket hard bags and trunk, LG high back seat, XJ rear shocks.

The list changes.
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  #13  
Old 08-07-2016, 09:56 PM
motoman motoman is offline
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....ya' got a PM.
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Old 08-07-2016, 10:03 PM
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I do? Guess I lost that too......
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Greg

Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.

― Albert Einstein

80 SG Ol' Okie;79 engine & carbs w/pods, 45 pilots, 140 mains, Custom Mac 4 into 2 exhaust, ACCT,XS850 final drive,110/90/19 front tire,TKat fork brace, XS750 140 MPH speedometer, Vetter IV fairing, aftermarket hard bags and trunk, LG high back seat, XJ rear shocks.

The list changes.
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  #15  
Old 08-07-2016, 11:47 PM
motoman motoman is offline
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I do? Guess I lost that too......
no,no.......not memory........PMs.
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