air mixture screw components

[Darrell]

Hello! The #1 cylinder wasn't firing at low rpm's, so after much troubleshooting, I removed the carbs to clean the #1 carb. I found 2 O rings and a washer ahead of the air/fuel adjuster screw and spring. And, as can be seen from the photo, one of the O rings is broken. I can see the O ring remnant in the orofice, which I will work to remove.

Question: How many O-rings belong here with the air/fuel adjuster screw? If two are needed, are they both the same? Where can I get one O-ring?

IMG_4603.jpg

[JoeInTUS]

There should be only one. I have found two on several occasions rebuilding carbs.

Randakk sells them individually and in complete kits. KM Carburetor has kits.

[Darrell]

Great! Thank you. I managed to extract the broken remnant so will re-assemble with just one.

[daves79x]

You may assume some/all of the other mixture screws have the same condition. But if the bike is working OK, don't worry about it now. Some of these o-rings get almost cemented to the inside of the tower. It takes a sharp, straight dental pic rotated very firmly on those to break them free and extract them.

Dave

[CBX-tras]

During the manufacturing process of the tiny washer (all washers for that matter), they're stamped or "coined" from flat stock, leaving one side of the washer flat and somewhat sharp, the other side rounded.
Being anal, I always put the flat side of the washer to the spring, the rounded side, to the softer, o-ring to help prevent any chance of damage to it.