Topic: carb rebuild clarification

[Nortstudio]

Hey folks. Rebuilding a set of carbs for my '76 550k. I am putting all new o-rings in, and need to know if it's normal for the main jet to sit loosely on top of the emulsion tube. I know the wing spring holds it in place - but when removing them, they were seated in there securely. Is that just because the old corrosion and o-ring shrinkage?

Also, in the photo below, there are 4 larger o-rings at the top. I'm pretty sure that they belong on the 2 couplers between carbs 1&2 and 3&4, but I think it only needs a total of 8, and with this kit set (4) it would total 16. Am I missing something, or are they just providing extras?

Thanks

[Bankerdanny]

I believe that the kits include o-rings for both sides of the connector tubes under the theory that you might only be fixing one carb, but would want to replace the o-rings on both sides of the connector.

I ended up with several spare o-rings when I did the carbs on my '77.

[Nortstudio]

Thanks Danny. I figured that was it, but wanted to make sure I didn't end up spewing gas out of unsealed orafices

Do you have the push in style jet?  Know if it's supposed to be sitting loosely???

Appreciate the help.

[Deltarider]

but I think it only needs a total of 8, and with this kit set (4) it would total 16. Am I missing something, or are they just providing extras?

Here's why http://forums.sohc4.net/index.php?topic=90925.msg1017309#msg1017309

[Nortstudio]

I remembered you had asked about that delta. This kit came with all of them - a full 4 per kit. It's labeled 16010-323-315

[Duanob]

You only need 8 of the fuel coupler o-rings total. They just give extras. Your main jet should actually push in pretty snug with new o-rings. Not loose at all. Sure you have the right o-ring? Trying to jog my memory on where the other three go. I think the smallest one goes on the bowl drain screw. The other two will be a sample fit for you. I matched all old o-rings with the new ones as I installed them. I also used Permatex #2 to hold the bowl o-ring in place. It's pliable and fuel resistant. Just use enough to hold it but not enough to squeaze out anywhere.

[Nortstudio]

I'm pretty sure he main jet gets the smallest one. The other small one, but fatter goes on the drain screw. That next size up goes on the needle seat.

No other one felt right on the main jet. The emulsion tube seems like it's in as far as it can go, but still they are lose. They sit in there ok, and then are held in by the wing spring and float. All 4 of them are exactly the same. Not sure what I'm doing wrong here.

I didn't take enough notes/pics, because I have a whole set sitting next to me, which I had planned on using for reference - but have not been able to take ANY of it apart, because of such heavy oxidation and corrosion. Bad move!

[Nortstudio]

I am in a deep, dark place right now my friends. Had to end up swapping out several parts from the corroded rack onto te newer one I just got (and have been cleaning) because they were incomplete.

Just about done and realized I needed a replacement arm/cam that plunges the needle, as well as a missing MAIN SPRING!  Ugh. The PO told me they came off a running bike. Good grief!

[TwoTired]

The emulsion tube must be fully seated into the carbs  They stand a bit proud of the carb bore.
The main jet should have full contact with the base of the emulsion tube.  Make certain you aren't putting the jet in upside down.  You should be able to read the jet numbers when installed.  New orings  Have to be squashed some in order to seal correctly.  Don't do this dry, or the orings can be abraded/nicked.  Vaseline or other GP grease can be used to ease the jet into fully seated position while compressing the jet orings.

Cheers,

[Nortstudio]

Ok. I will check that out when I open the floats again. I just got finished attaching the carbs back to the rack holder. Man!  I now understand why people suggest not removing the carbs from the rack.

I had to do it - and I'm glad that one day, probably 47 days from now, I'll be able to look back and say " I'm glad that's finished."

[Nortstudio]

The jets now seem seated well. I guess the pressure of closing them up made them sit nice. One was a little less "stuck" in there but seemed ok. I will keep an eye on that one when fuel starts flowing.

This is how she looks...



Thanks for all your help folks.