oring missing

[Guest]

Hi everyone. I am in the process of rebuilding my other set of carbs for my 850G, have ordered oring set from Mr. Barr. When I removed the choke pistons, the orings was missing from the caps. Would this cause the bike to run lean?? Thanks, Mark

[gs850cafe]

probably so. more air with out more fuel will make a lean condition

[retcol]

I like the color of your bike - great choice.

[mvalenti]

Hi everyone. I am in the process of rebuilding my other set of carbs for my 850G, have ordered oring set from Mr. Barr. When I removed the choke pistons, the orings was missing from the caps. Would this cause the bike to run lean?? Thanks, Mark

Mark,

yep, sounds about right. Fully clean/dip your carbs... spraying carb cleaner and air wont clean it sufficiently.

-Mark (also with a 1980 GS850G... sort of....)

[londonboards]

O Rings Missing

I found an O ring missing on the throttle valve of mine:

See: My GS1100G Blog - Butterfly Capers

and whilst I am doing the carb rebuild I have ordered those choke O rings (but not the rubber caps) as mine were very hard.

I would guess someone had "rebuilt" yours at some time and lost one when they were being reassembled.

Greetings

[chuck hahn]

I was always wondering why they even put one there in the first place.


The plunger has a rubber tipped base, the stem comes up thru the dust bootand slides, and the boot isnt an airtight seal by any means, so why the oring??

Its my impression that if the rubber sealing surface on the plungers is good, then the rest is just dress up.

[Steve]

When I removed the choke pistons, the orings was missing from the caps. Would this cause the bike to run lean?? Thanks, Mark

No, that missing o-ring will not affect the operation of the engine in any way.

I was always wondering why they even put one there in the first place.

I agree, Chuck, I think it's only there to seal moisture out of the threads.

When the "choke" plungers are closed (normal running), there is virtually no chance that enough air is going to get past the plunger to affect operation.
While the dust caps are not real tight on the plunger shaft, they do touch all around and provide a modest seal.

.

[chuck hahn]

Very MODEST at that if they are old and the rubber has shrunk. Best place to look for damage is at the plunger ends. Inspect the rubber seats AND be sure the centering pin is not bent..that pin has to perfectly align with the hole in the bottom of the carb body or it WILL hang up and can cause air to bypass in that carb.

Remeber how we used to roll push rods form our cars on something to see if they were bent? Well the same applies here. Roll them ( they will go in a circle) but pay attention to the end of the pin to see it looks straight.

[chuck hahn]

Guess you could also lay the stem on something that allows the base to clear and just finger roll them and watch the end of the pin for trueness.

[hoppy1]

Guess you could also lay the stem on something that allows the base to clear and just finger roll them and watch the end of the pin for trueness.

Thanks for all the info, I couldn't see how any air could get in if the choke piston was closed. And, I will check all the piston tips for being bent. I have an old peice of glass I can use.