Dynojet Carburettor Jet Kits

The Principles Of Improved Carburettor Management

Whether you run a standard motorcycle, or a tuned sportbike, Dynojet carburettor kits can provide you with a simple and affordable solution to all your carburation problems. Dynojet Kits increase power and smoothness throughout the entire rev range, while maintaining optimum fuel economy.

Many newer bikes have very flat power and fuel delivery curves when used with the stock exhaust and air-box. When aftermarket pipes are used, the power curve is usually not flat. You find the need to lean out for low speed and richen up for top end, or leaner on the top end and richer at the low speed. In order to achieve full function and driveability, Dynojet develops shrouds or cap style nozzles for adjusting the upper or lower top end. They also have an effect similar to fuel injection by breaking up the fuel as it enters the air stream.

The design of the needle is where Dynojet spends most of its research and developement time. The needle is designed to give the correct amount of fuel throughout the mid-range and is also designed to allow adjustment from groove #1 to groove #6 with little or no effect below 3000 rpm. Then, with correct end dimensions, the needle will have little effect on the main jet regardless of needle position. This isolates all circuits from each other and ensures easy set-up of the midrange and driveability.

Dynojet develop their main jets to correctly serve two functions; static load and dynamic load. The static load is the fuel received through the main jet in the upper gears, where the tachometer is moving very slow. The dynamic fueling portion of the main jet is the amount of fuel received from the jet in the mid-range potion of the power. For example, you have a Suzuki GSX-R1100G or H with #130 main jets. You then install #125 main jets. After running the bike you notice the top end has improved but the mid-range doesn't pull as well. You then install #135 main jets and you notice the mid-range is great but the top end is slower. This is a common compromise when using stock main jets and needles. If you install Dynojet #130 main jets, you would get the mid-range power of the #135 main jets and the good top end of the #125 main jets. This is because the Dynojet main jet has a venturi design more consistent to the engine's needs.

This jet allows air into the emulsion tube to mix with fuel being drawn up from the float bowl. It controls the amount of fuel which can be pulled from the float bowl into the venturi. The larger the size of the main air jet, the more air you get and less fuel. The smaller the main air jet, the more fuel you get and less air. Dynojet alters this only to achieve the flattest possible fuel delivery curve.

This controls 100% of the engine idle and 25% of the transition onto the needle. Dynojet has found that the engine will idle with the standard pilot jet, with or without the air-box and with the slides and needles removed from the carburettors; therefore Dynojet never change the pilot jet. Doing so is proof that you are not using the other circuits correctly. Idle and off idle is controlled by the mixture screws and the float level which have the most positive effect below 4000 rpm. On some models the pilot air jet is changed to provide optimum fuel economy. Correct balancing of the carburettors also ensures a smooth idle.

Each Dynojet Carburettor Kit is put together with full and comprehensive instructions which show step by step installation and testing procedures to ensure a perfect set-up every time. Dynojet aim to please all their customers and their continuing development ensures this.

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Refund Policy

We guarantee 100% customer satisfaction. This means that if for any reason you are not fully satisfied you can cancel within 7 days of ordering or return any purchase in unused and good condition within 7 days from receipt and obtain a full refund of the price you paid or replacement of the product.

Within 7 days from receipt send us a quick notice either by fax or email explaining your reasons (change of mind, fault, etc.) and indicating if you prefer a replacement or to receive your money back. Then send us back the items with return costs at your charge.

Upon receipt of the returned goods we will either ship you free of charge the replacement items if available, or if not, we will refund the full price of the items you are returning, according to your instructions.

We will not accept for refund or replacement: Goods that have been either damaged or used; Goods returned to us after 7 days from receipt; Packages returned on a COD basis or freight collect.

Note

We aim to ensure accuracy in all our published information. However, circumstances outwith our control can lead to future change. If this has been your experience, you have our sincere apologies. Cruiser Ecosse cannot accept liability for any loss or damage arising in respect of any statement contained in this information. This information does not form part of a formal contract and we reserve the right to change it at any time.

We do not sell or supply exhaust systems or mufflers compliant with EU Directive 97/24/EC Chapter 9.

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