Why Constant Velocity Carburetors? Most KZ and Z owners are looking for ways to bump up the performance of their bikes. If you keep an eye on aftermarket carburetor options, you quickly discern that older VM29 and VM33 smoothbore carburetors and modern Mikuni RA Flatslides cost dearly and the prices continue to rise. A less expensive and perhaps just as effective option is the use of refurbished Constant Velocity carburetors. Both Keihin and Mikuni manufactured this variety of carburetor.

Mikuni Bs34 Carburetor Manual - Looking at some Mikuni BS34 Carbs and parts Miko Zen. How to Disassemble and Clean a Mikuni Carburetor - DIY Snowmobile, Mower.Mikuni BS (CV) Carburetor Rebuild Tutorial Remove pilot jet plug (replace if petrified) The pilot jet is located down in the recess tunnel under the plug.Carburetor.

Things to look for when purchasing a constant velocity type assembly is that it has a choke lever or pull knob on the assembly as opposed to use of a remote, cable operated choke lever. A remote choke lever or knob means fabrication. It is also important to get an assembly with vacuum spigots on each carburetor so they can be synchronized easily. Some assemblies DO NOT have this feature and rely on intake manifold-located fittings. Our seat-of-the-pants testing has indicated that a properly tuned set of CV carburetors will perform as well or outperform a set of smoothbores on a stock bike with only intake and exhaust modifications. Which Carburetors to Use? As noted, there are choices.

The Keihin CVK34 or CV34 are used on KZ750 models. A drawback of the Keihin CV series is that some parts are unavailable (slow jets in particular). The Mikuni BS32/34 family has better parts availability. Wiredgeorge Motorcycle Carburetors recommends and sells the more readily available BS34 assembly which works great in almost all applications. Installation Tips/Steps First, remove your old carburetors, airbox and carburetor holders. The picture below shows the old airbox and intake manifolds. Note that we use stainless socket head bolts (6mm w/1.0 pitch 16mm long) to retain the intake manifolds.

Install New Intake Manifolds Install the new intake manifolds. You can see that the ones for the CV carburetors are MUCH larger in diameter. These are the intake manifolds used for 1981-1983 KZ1000J model carburetors. They bolt right up after elongating the mount holes with a file or Dremel.

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Note that there is no vacuum spigot on these manifolds. Prepare the Intake Manifolds After the J model intake manifolds are bolted to the cylinder head, install clamps and lubricate the inner surface of the manifolds with WD40. Do this EVERY TIME you install carburetors and they will slide into place easily! The BS carburetor uses a single pull cable with different ends than are used on a VM style throttle cable. The following steps will show you how to quickly change out and adjust the cable. Cable adjustment can be done when the carburetors are installed.

The VM cable screws into the right hand switch gear and is held by a locknut on one end and the other end has a threaded barrel with the cable going through and two locknuts to hold it on the throttle linkage. The BS cable also threads in the hole in the right hand switchgear and the other end is smaller to fit into a cup fitting on the throttle linkage of the BS assembly. Cabling Steps Remove the two M5 screws that hold the right hand switch gear together and in place. Remove the locknut and unscrew the cable end from the switch gear.

Remove the cable end from the throttle inside the switchgear. Remove the old cable from the throttle sleeve and note its routing. The new cable goes into the front opening of the switch gear. Screw it into place and tighten the 14mm nut. Turn the throttle so that the cable holding sleeve is pointed upwards and put the new cable end into the front slot in the sleeve and the cable will wrap around the front of the throttle.