MXT main jet set Set 1 50-72 carburetor jets compatible with CPI carburetor

This main jet set is intended for fine-tuning carburetors in CPI design. The included jets with smaller increments are particularly suitable for precise adjustments of the fuel quantity under low to medium load. The set is used for maintenance and adjustment work on the carburetor.

Product features:

• Main jet set with finely graduated jet values
• Assembled as Set 1
• Designed for CPI carburetors
• Suitable for carburetor tuning at partial load and full load
• Used in the context of maintenance and repair

The fine gradation of the jet values allows for a step-by-step adjustment of the fuel flow and supports a controlled engine operation.

Technical details:

• Product category: Carburetor jets
• Design: Main jets
• Jet values in the set: 50, 52, 54, 58, 60, 62, 64, 66, 68, 70, 72
• Function: Control of the fuel quantity in the upper load range

Main jets influence the mixture formation when the throttle valve is open and affect combustion and engine behavior.

Vehicle and model compatibility:

• Suitable for carburetors in CPI design
• Can be used on two-wheelers with CPI carburetors

Since different carburetor types may be installed depending on the vehicle, year of manufacture, and equipment variant, the actual carburetor design is crucial.

Installation and application instructions:

• Replacement of the main jet in the carburetor through the intended access
• Tuning by gradually adjusting the jet size
• After replacing the jet, check engine operation and spark plug condition

A suitable main jet supports stable mixture formation and reduces the risk of too lean engine operation.

Note for inspection before purchase:

• Please check before purchase whether a CPI carburetor is installed and which main jet type is required. These jets are only compatible with the specified carburetor types.

Brief info: Carburetor - Installation, adjustment & tuning

Installation: Mount the carburetor without tension, check the intake manifold and seals for air leaks, adjust the throttle cable for smooth operation, ensure fuel supply (gasoline, oil, and vacuum).

Basic setting: Mixture screw usually 1.5 - 2.5 turns open, idle screw for stable idle adjustment, always tune the engine when warm.

Tuning:

• Main jet = full throttle / high load
• Needle position = partial load & acceleration
• Slow jet = idle & starting (usually does not need to be changed)

Check: Inspect spark plug condition

• white = too lean
• black = too rich
• brown = optimal

Important: After changes to the air filter, exhaust, or cylinder, a new carburetor tuning is essential.

About the manufacturer MXT

MXT is the powerful in-house brand of Heavy Tuned and stands for high-quality replacement and tuning parts for motorcycles, scooters, and moped models.

As a reliable alternative to OEM parts, MXT offers a wide range of cylinder kits, carburetors, crankshafts, variomatic components, bodywork parts, and batteries. The products convince with solid workmanship, precise quality, and a strong price-performance ratio.

Ideal for riders looking for durable replacement parts and tuning parts for many vehicle models.