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Mikuni VM29 Tech

These high-performance carbs made by Mikuni from the mid 1970's thru the late 1980's
have much better flow characteristics, and deliver more power than stock carbs can.
They also, in most circumstances, are a direct bolt-on installation for all 1973 thru 1980
 Kaw 900's and 1000's. They were also made in variants for the Suzuki GS and Honda CB models.

The Mikuni 29mm smoothbore carbs are very similar in appearance to the Mikuni VM26
& VM28's which were used on 1976 thru 1980 Kawasaki 900's and 1000's......
But they actually differ internally in many ways from the stock 26's and 28's......
One of the most important ways they differ is that they are more fragile
to work with than the stock carbs.....
As a result of mis-handling by inexperienced mechanics, many used sets are damaged....

The venturi of a VM29 carb is shaped by the piece shown above, called the "jet block". The main jet / needle jet
  tube of a VM29 threads in to the threaded  neck of the jet block, seen protruding in the pics left / center.

Overtightening the main jet or the main jet tube while servicing a VM29 can crack the neck of the jet block,
 as shown in pic at right, causing the carb to perform badly......
This is something that wouldn't happen with  a set of stock VM26 / VM28 carbs......
These pieces are no longer available new, and very hard to find........

        An inexperienced tech servicing VM29's will often destroy them without even knowing it by doing this....

Most used sets have at least one broken jet block neck.....
This can only be found by totally knocking down the carbs.....and knowing what to look for....

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