Carburetor Balance Tube?

hefyjefy · Post by **hefyjefy** » Mon Apr 21, 2014 12:47 am

The Honda 250 305 Shop manual states:

Poor idling may be caused by...
"an intake manifold leak or leakage between the carburetors at the balance tube"
Does anyone know where the "balance tube" is? As far as I can see there is no connection between one carburetor and the other, either on the bike (CB77) or in the parts manual.
Geoff

G-Man · Post by **G-Man** » Mon Apr 21, 2014 1:56 am

Probably a typo. The CB125 twin had a balance pipe and I think that the CB250/350 had one but not the CB72/77

G

bonjour · Post by **bonjour** » Mon Apr 21, 2014 12:47 pm

Then..

What's this on my CB77 ? The little tube under the air intake.

I haven't touched it, runs fine this way, so it's fine with me.

G-Man · Post by **G-Man** » Mon Apr 21, 2014 12:56 pm

That's a pair of breathers that lead to the inlet valve guides to prevent oil being drawn past the valve stems on overrun. Deleted on later models.

G

hefyjefy · Post by **hefyjefy** » Tue Apr 22, 2014 12:24 am

OK - yes I have those two pipes linked - (good picture BTW) - just checking...

schwantz34 · Post by **schwantz34** » Tue Apr 22, 2014 7:49 am

i have nothing on them, is that bad? or should i link them with a piece of tube?

G-Man · Post by **G-Man** » Tue Apr 22, 2014 6:40 pm

Linking them will stop dirt getting in.

G