At long last, the VM O-ring kit is
Eighteen bucks. (Slightly
higher outside the U.S.)
[If you're in a hurry, I'll take
Paypal, but you'll pay the 85¢ Paypal fee.]
A bargain at half the price!
This kit is designed for the Mikuni VM carburetors that were
1977-1979 Suzuki four-cylinder engines. (It's probable that there
are Kawasaki fours that use the same carbs, so these should fit your
bikes as well. I guarantee
nothing.) There's a rebuild procedure for these carbs here: by
Paul Musser at the GS Resources.
are 32 O-rings in six sizes, shown here:
Since each part has about 14
names, varying with who you talk
to, I simplified things and just used A-F.
Part 'D' is the bowl
plug. Part 'E' is the choke plunger assembly.
Part 'F' fits the fuel tubes; some VM carbs use 12 of these, some use
8, and some don't use any at all. I include 12 in every kit
because I have no way of knowing if someone swapped carbs on your
bike. Having leftovers beats being shorted.
Part 'B' is the worst nightmare, for most folks, since the dealerships
don't even have part numbers for these. They fit the mysterious
'emissions mixture screw' which doesn't even show up on factory
diagrams. It's seen here:
One of many problems you'll
when you search for these retail is the difference in cross-sectional
area. Some are fat, some are very slender. Typically, if
you find an O-ring with an acceptable I.D., it'll be too fat. A
proper fit requires the right material, the right I.D. and the right
cross-section. Look at the
difference between A and B in this photo:
The smaller O-rings are substantially fatter. If
you have too much OR too little material in the ringland, you are
headed for problems.
For a while, this was a very common source of trouble for
people on the GS Resources website. It's common to
drain fuel from the bowls by removing the drain plugs.
This disturbs ancient O-rings, which now leak. Replacements
with the right I.D. (or reasonably close) are available from generic
kits; most auto part stores can find a 'match' in what are known as "Dash Size assortments".
The problem is, the dash size for that I.D. is far too fat. In
direct comparison, it looks pregnant. You have to really crank on
the screwdriver to tighten that drain plug now! Guess what's
happening. The odds are overwhelming that you'll find slivers of
O-ring in the fuel bowl. Guess where those slivers wind up.
You'd be pulling the carbs again very soon.
To order this kit, proceed to the order page.
Before you do anything rash, though, you should look over page 3 (Intake stuff).