Stage 1 Jet Kits

Intended for motorcycles with a stock engine using the stock airbox, air filter and stock exhaust pipe. Stage 1 kits are fully adjustable to allow the use of a well designed aftermarket exhaust pipe and stock replacement air filters like K&N. Stage 1 kits are designed to improve throttle response and driveability and in most cases power increases of approximately 5% throughout the entire power range can be achieved.

Stage 2 Jet Kits

Intended for motorcycles with a stock or mildly tuned engine using a well designed aftermarket exhaust pipe with a modified airbox and a stock replacement air filter. Stage 2 kits are designed for applications where individual filters cannot be installed and for applications where airbox modification improves the engine's performance. In most cases power increases of approximately 8% can be achieved.

Stage 3 Jet Kits

Intended for motorcycles with stock or mildly tuned engines using a well designed aftermarket exhaust pipe and individual air filters. In most cases power increases of 10-15% can be achieved. However driveability may be compromised particularly with short stroke, high rpm motors. On some modern engine and airbox designs, individual filters and proper jetting offer no performance improvement yet compromise driveability, in such cases stage 3 kits are not available.

Stage 7 Jet Kits

Each kit is assembled with full and comprehensive instructions, which show step-by-step installation. Designed for race use only or special applications. With the exception of our stage 7 V-MAX kit, all stage 7 kits are high RPM, race- track use only and are not suitable for street use.
Jet Kit Information
Fuel Needle
The design of the needle is where Dynojet spends most of its R&D time. The needle is designed to give the correct amount of fuel throughout the midrange and is also designed to allow adjustment from groove 1 to groove 6 with little or no effect below 3000 RPM. With the 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, improve throttle response and driveability - in most cases; power increases of approximately 5% throughout the entire power range can be achieved.

Main Air Jet
This jet allows air into the emulsion tube to mix with fuel being drawn from the float bowl. It controls the amount of fuel that can be pulled from the float bowl in the venturi. Dynojet alters this only to achieve the flattest possible fuel delivery curve.

Pilot Circuit
This controls 100% of the engine idle and 25% of transition onto the needle. On some models the pilot air or fuel jet is changed to provide optimum fuel economy- Correct balancing of the carburettor also ensures a smooth idle.

Main Jet
We develop our 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 fuelling portion of the main jet is the amount of fuel received from the jet in the midrange portion of the power.

We can supply Dynojet Kits for all popular makes and models of bike.