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Old 07-15-2019, 08:03 AM
alaskey2 alaskey2 is offline
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O rings in float bowl

Finally had some time to take the bike out yesterday and it wouldn't start

Sorted that out and turns out 1 and 3 aren't firing. Had spark, it's time to suck it up and clean the carbs.

https://photos.app.goo.gl/YuePkYjqNtWD4Xdk9

It's pretty easy to see what the problem is, there's an o ring in various stages of decomposition in the bottom of EVERY bowl. I got what I could apart, took a few pictures hoping someone could point me in the right direction on where this o-ring came from and where to buy a new one.

https://photos.app.goo.gl/nav6cnsa5JcGvWKy7

https://photos.app.goo.gl/234Ju2G52dPtMHz1A


This one was REALLY dirty
https://photos.google.com/photo/AF1Q...NEf2L4_ny0z89A


If I had to guess, it came from here.
https://photos.app.goo.gl/332HTVV1a81gAimg9


A few of these bolts felt funny when they came out, I think there might be some tread stripping or corrosion. I marked the top EZ to remind myself not to crank them down.
https://photos.app.goo.gl/Jd18kUv33GGD2gfw6

End of the night picture
https://photos.app.goo.gl/sDw2P8W32fi25MkS6
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  #2  
Old 07-15-2019, 08:54 AM
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Who was the last person to work on the carbs?
It looks like they thought you had the later model carbs with "O" rings, and NOT the early WITHOUT. You should be able to just clean the carbs and re-assemble, set the float levels, bench sync, and install. You WILL need to do a proper sync and mixture setting once on.
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Old 07-15-2019, 09:01 AM
alaskey2 alaskey2 is offline
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Thanks Phil!!

The PO rebuilt them before I bought the bike. It always started so i never had a reason to open the carbs until now.
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Old 07-15-2019, 09:21 AM
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Alright Alan, fess up:

http://www.xs11.com/forum/showthread.php?t=42899

Hope you have a sense of humor.
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Old 07-15-2019, 09:34 AM
alaskey2 alaskey2 is offline
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That's too funny!!! Selective memory I guess
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Old 07-15-2019, 11:16 AM
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You got the carbs down that far be sure to replace the throttle shaft seals .
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Old 07-15-2019, 12:05 PM
alaskey2 alaskey2 is offline
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Is there a walkthrough or tech tip on the butterflies?
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Old 07-15-2019, 03:03 PM
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Quote:
Originally Posted by alaskey2 View Post

If I had to guess, it came from here.
https://photos.app.goo.gl/332HTVV1a81gAimg9
There are no threads around the fuel valve body. It is supposed to have a fiber-washer gasket if it is a 78 carb, not an o-ring. I suspect you have a transitional 78/80 carb bank.
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Old 07-15-2019, 03:16 PM
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What I meant to say is 79/80 transitional carbs.
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Down to two 1978 E's. Both stock air boxes with K&N filters, one with 81H pipes and carbs,
One with Jardine 4-1 pipes. 8500 feet elevation.
03 Honda ST1300 ABS
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  #10  
Old 07-16-2019, 07:10 AM
alaskey2 alaskey2 is offline
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Hey Skids,

The Carbs have an E on the bottom, does that help identify anything?

And for everyone else, should I have plugs in the sides of the carbs without a fuel T? See picture below. Only one carb has a plug there,

https://photos.app.goo.gl/ccaTV7Qxo7JHUCue8
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Old 07-16-2019, 07:28 AM
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Quote:
Originally Posted by alaskey2 View Post
Hey Skids,

The Carbs have an E on the bottom, does that help identify anything?

And for everyone else, should I have plugs in the sides of the carbs without a fuel T? See picture below. Only one carb has a plug there,

https://photos.app.goo.gl/ccaTV7Qxo7JHUCue8
Is the bottom port drilled all the way through??? If so, it is a fuel feed. The model E carbs had ports above the fuel feeds to accomadate breather tees that ran two hoses back to the air box. Did the pilot jets have screw-on caps?
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Skids (Sid Hansen)

Down to two 1978 E's. Both stock air boxes with K&N filters, one with 81H pipes and carbs,
One with Jardine 4-1 pipes. 8500 feet elevation.
03 Honda ST1300 ABS
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  #12  
Old 07-16-2019, 08:50 AM
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Those carbs are the early type, 78-79. Those plugs on the sides of the 1 and 4 carbs mean nothing, cosmetic only. Also, that O ring in your first pic doesn't belong to your type carbs, you don't need those.
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Last edited by bikerphil; 07-16-2019 at 08:52 AM.
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  #13  
Old 07-17-2019, 08:15 AM
alaskey2 alaskey2 is offline
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I got the carbs back together, did a little bench sync. All four cylinders are firing, but the bike isn't returning to idle as quickly as I remember. Also, when I was trying to get a video of this, the throttle ran away (RPMs increasing on their own). Video below if anyone wants to chime in on that.

https://photos.app.goo.gl/H4LitQpevBvhwJcC7



I also can't get the tab at the front of the seat pan to stay under the frame bracket, but that's probably just misalignment.
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  #14  
Old 07-17-2019, 10:12 AM
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The butterfly seals are a C. Not a standard o'ring. Many Mikuni carburetors use the same one. OEM is readily available. Mike's XS has them aftermarket. The BS38 & BS34 on the XS650 use the same seals.
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Old 07-17-2019, 05:41 PM
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Until carbs are synced with gauges, you can't depend on the idle working.
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