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Single Carburetor Kit buy in Richmond
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Single Carburetor Kit

Single Carburetor Kit

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Are you still annoyed by the erratic high-idle problems so common with larger Mikuni TM flatslide carbs? If so, here is a product that does an excellent job at stabilizing the idle speed, but also improves the atomization of the fuel at partial throttle settings. The V.I.P., or Velocity Intense Performance, is a combination venturi divider and venturi modifier unlike any other similar device.

Think of 33mm carb performance (Yamaha) and that of a 38 or 40mm carb. The smaller carbs have excellent throttle response and fuel atomization, but the bigger carbs flow more air on top end. How can we get more of the benefits of both?

One way is to make the carb "act" smaller during the lower throttle settings - this is accomplished by a venturi divider. There are a number of simple venturi dividers on the market, primarily used in dirt bike applications, where an additional plate (or plates) are installed into the venturi to increase venturi airspeed and velocity.

The VIP divides the engine side of the carb venturi in half (horizontally). At any throttle position below Ѕ throttle, this helps to maintain airspeed velocity by itself. The VIP then takes this approach one major step further by adding a second venturi (now patented) to the floor of the carburetor.

Several things are happening here. The second venturi, or venturi ramp, that is part of the VIP design, is creating a slight (V-shaped) narrowing of the venturi on the bottom of the carb floor to further increase airspeed (by over 35%) at partial throttle settings. Look closely at the bottom of the VIP and you'll notice a "slot" that exposes an orifice on the carb floor - that's your pilot jet fuel delivery. Anytime your engine is running, fuel is being delivered through this opening.

One of the problems larger bore carbs have is the airflow is slow and in "chunks" with the larger bore engines, pulsing back and forth, so the fuel climbing the jet needle and being delivered from the pilot circuit often remains as large droplets as it enters the engine, instead of being atomized (broken into smaller molecules and vaporizing for combustion) into the air stream like it does so well in a smaller bore carb. Liquid fuel does not burn; power and throttle response comes from fuel that is atomized.

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Single Carburetor Kit
Single Carburetor Kit
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