Topic: Cb500/550 Float question. What makes'm Buoyant??

[L.A. Nomad........]

The Cb500/550 carburetor floats: Do they hold pockets of air on each side??  Or is the material on each side buoyant?



I have one with some wear and a pitted surface.

[rb550four]

Air.

[flybox1]

the black foam float material is less dense than the density of fuel.  they are solid. 
the brass floats use air to keep them afloat.

[Duanob]

550s have foam floats so, solid/ more bouyant than gas

[L.A. Nomad........]

Thanks guys!!

I'm going through my bin of really rough carb parts/racks. Refurbishing what can be salvaged, then setting them free...

I've rescued most everything, even a carb rack that sat in a parts cleaner tank for months!

Tools that helped: Blasting cabinet: Baking Soda, Glass beads, tiny bristle brushes, steel wool, brass brushes, chem dip (yuk!)..


Only 2 things I couldn't rescue, 2 carb bodies.

carb 1-Post for float pin is broken, I have the broken part. (i have hope for repair)

carb 2- The post where the main jet sits, has been eaten away by corrosion! The rest of the body is perfect!  Any ideas for this kind of repair???

[dave500]

they only float as they weigh less than the fluid they displace,same as anything.

[RevDoc]

"carb 1-Post for float pin is broken, I have the broken part. (i have hope for repair)"

Nomad, I have a friend who is a retired bike racer and now has a small repair shop that I help out in occassionally.  He has had success with this type of repair using J-B Weld. Found in most adhesive aisles of auto parts or DIY stores. Trick is making sure the carb can sit undisturbed in a warm dry place for 24 hrs. for full strength.  Float pin in column, of course, to ensure proper alignment.