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From the manufacturer

Gunson historically has been renowned for its innovative products that make life easy for the automotive enthusiast who seeks high performance and trouble free motoring.

A British tool company based in Warwickshire, United Kingdom. Gunson Tools draws on years of experience to introduce quality products which offer real value for money.

All our products are responsibly sourced both from trusted ethical partners across the world PLUS (uniquely as an automotive tool brand) our own manufacturing base in the UK. Trusted quality products like Eezi-Bleed, ColourTune, Carbalancer and Eezi-lap are just a few names within the range.

Combining our British manufacturing, our years of experience and vast expertise in the automotive sector helps us achieve our aim of bringing high quality tool solutions first to market and being No.1 choice for the Classic vehicle technician.

Suitable for use on SU, Solex, Auto-Lite (Formoco) Stromberg, Weber and Zenith and can be adjusted to fit most carburettors including side-draught, down-draught with air intakes (Venurei) from 25mm to 67mm (1”-2”) diameter

Gunson Carbalancer

Internal combustion engines use a mixture of air and petrol to generate their power. The performance therefore is influenced by the air flowing into it and the petrol that is metered out by the carburettor. Unless the air flow in Twin or Multiple carburettors is correctly set, the correct mixture adjustment is unlikely to be achieved.

Easy read scale indicates the air flow and allows adjustment to optimum efficiency Provides smoother and better acceleration Carbalancer can be adjusted to fit most carburettor Easy to follow instructions

General Instructions

1- Warm up the engine to normal operating temperature.

2- Remove air filter assemblies.

3- Disconnect throttle linkage between carburettors (if appropriate).

4- Start the engine and allow to idle

5- Clip the scale vertically to some convenient part of the vehicle.

6- Set the inner bezzle to a fully opened position and press the Venturi adaptor firmly into the Venturi of the first carburettor, holding the outer rim.

7 -With the outer rim in one hand adjust the inner bezzle to give a reading on the scale at any convenient mark. Do not restrict the breathing of the engine by over adjustment, causing the engine speed to drop.

8- Without altering the adjustment on the inner bezzle, remove the Micro-Metering Head from the first carburettor and press it into the Venturi of the second carburettor.

9- Adjust the throttle screw of the second carburettor (or balancing screw) until the same reading is obtained on the scale.

10- Repeat step 8 | 9 for successive carburettors.

11- Reconnect the throttle linkage and check that the balance has not slipped.

12- If there is only one throttle stop screw the tick over speed may now be set with gradual adjustment. It there is a throttle stop screw for each carburettor, adjust each one evenly to obtain a suitable idling speed.

13- Clean and replace the air filter assemblies.

CAUTION

As with any plastic component, the Carbalancer scale will soften if allowed to come in contact with hot engine components, particularly the exhaust manifold. Care should be taken to ensure the unit is not mounted in contact with hot parts of the engine.

General Instructions

Micro-Metering Head

This component is supplied in two parts. To assemble, it is only necessary to push the two units together as illustrated. For some carburettors with obstructions within the Venturi, it may be necessary to trim portions of the tapered adaptor unit to gain the required clearance.

On some carburettors where the shape of the air intake or obstructing projection interfaces with the carbalancer, a simple adaptor can usually be made up from rubber hose of similar size.

Adjustment

Adjustment of the reading on the scale is made by holding the outer rim of the head in one hand and rotating the inner bezzle with the other. Once this adjustment has been made for the engine, it is only necessary to move the head from one carburettor to the other, pressing the adaptor firmly into the Venturi and adjusting the throttle stop screws until the same reading on the scale is given by both or all carburettors.

Easily read scale

The scale is divided to make readings on individual carburettors easy to remember. In setting the carburettors, the float can be positioned next to convenient mark or number on the scale by adjusting the inner bezzle on the metering head or the throttle screw. The scale has a spring clip which is connected to the scale holder by a universal joint. Both the scale and the holder are tapered and the narrow end of the scale should be pushed into the wide end of the holder. The tension on the universal joint is adjusted by the distance that the scale is pushed into the holder. To avoid the holder losing its springiness, it is advisable that the scale should be removed before storage.

The clip should be fixed to any convenient projection under the bonnet within easy reach of both carburettors and the scale should then be adjusted on the universal joint until it is reasonably vertical. The carburettors may then be balanced in the manner described in the general instructions.

• Automotive Tool

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