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Carburetor Balancing Using Vacuum Gauges

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Carburetor Balancing Using Vacuum Gauges
Carburetor Balancing Using Vacuum Gauges

A = adjuster between carbs one and two. B = adjuster between the banks (one and two and three and four). C = adjuster between carbs three and four.

John H Glimmerveen Licensed to About.com

Carburetor balancing on multi-carb, multi-cylinder engines is very important. Each carb must supply the same amount of mixture (fuel and air mixed) for the engine to run smoothly, develop good power, and maintain fuel economy.

A typical application of this design can be found on many Japanese four cylinder engines manufactured from the 70s onwards, such as: GS Suzuki's, Honda CB's, and Kawasaki Z series machines.

The most accurate method of balancing these types of carburation systems is by using vacuum gauges (see note regarding rebuilt carbs). When attached to the inlet systems, the vacuum gauges measure the amount of vacuum drawn on each gauge as the engine is running. The effectiveness of this system is evident as the carbs are adjusted: small adjustments can be seen on the gauges as the carbs are adjusted.

Capable of Greater RPM

For example, as the carbs are brought back into adjustment (assuming they were out in the first place) the engine idle rpm (revs per minute) will increase. Effectively, this indicates that for a given throttle position, the engine was capable of pulling greater rpm.

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