On FJ400D-equipped carbureted Cushman Shuttle 2 models, the documented factory carburetor uses a #106 main jet and #52 pilot jet. Confirm the model year and engine before ordering, because other carbureted versions can differ and later EFI versions have no carburetor jets.
Shuttle 2 • Main & pilot jet sizes
Shuttle 2 carburetor jet sizes at a glance
Main jet
#106 on documented FJ400D carbureted applications
Pilot jet
#52 on documented FJ400D carbureted applications
Altitude
Use the exact model-year service-parts manual for any altitude jet
Before ordering
Identify the engine and carburetor, then read the number stamped on the existing brass jet.
Lean symptoms
Needing choke, surging or load bog can also come from a clogged passage, weak fuel supply or intake leak.
Rich symptoms
Black smoke or plug fouling can also come from a stuck choke, high float level or leaking needle valve.
How to choose the correct Cushman Shuttle 2 jet
Shuttle 2 jetting symptoms
Needs choke to run
Clean the pilot and main circuits and check fuel supply and an intake leak before fitting a larger jet.
Bogs under load
A restricted main jet can cause this, but so can weak pump flow, low bowl fuel level or a blocked filter.
Black smoke / fouled plug
Check choke position, float level and needle sealing before assuming the main jet is too large.
Runs well only at low speed
Main-jet or main-nozzle restriction becomes more likely once the pilot circuit is known to be clear.
Poor idle only
The pilot circuit matters much more than the main jet at idle.
High-altitude operation
Use the model-specific elevation chart where available; do not guess how many jet sizes to reduce.
Shuttle 2 jet specifications
Applies to: FJ400D-equipped carbureted gasoline version.
Engine: 401 cc Kawasaki FJ400D on documented carbureted years.
Carburetor: Kawasaki fixed-float-bowl carburetor.
Main jet: #106 on documented FJ400D carbureted applications.
Pilot jet: #52 on documented FJ400D carbureted applications.
Altitude: Use the exact model-year service-parts manual for any altitude jet.
Model-specific note
The documented FJ400D carburetor used on Cushman Shuttle 2 applications is fitted with #106 main and #52 pilot jets.
Cushman Shuttle 2 carburetor jet FAQ
What is the Cushman Shuttle 2 main jet size?
#106 on documented FJ400D carbureted applications. The documented FJ400D carburetor used on Cushman Shuttle 2 applications is fitted with #106 main and #52 pilot jets.
What is the Cushman Shuttle 2 pilot jet size?
#52 on documented FJ400D carbureted applications.
Does altitude change the Cushman Shuttle 2 main jet?
Use the exact model-year service-parts manual for any altitude jet.
Can I install a larger jet in a Cushman Shuttle 2?
Only after confirming the engine, carburetor, altitude and cause of the lean symptom. A clogged passage, intake leak or weak fuel supply should not be corrected with an oversized jet.
How do I identify the correct Cushman Shuttle 2 carburetor jet?
Use the stamped jet number together with the engine code, carburetor ID and model year. Cross-check those identifiers against the matching factory parts or service information.
What is the difference between the main and pilot jet on a Cushman Shuttle 2?
The pilot circuit controls idle and very low-throttle fueling. The main jet becomes dominant as airflow, throttle opening and engine load increase.
Jet sizes can change with engine, carburetor revision, model year and altitude. This page applies only to the FJ400D-equipped carbureted gasoline version. Do not drill jets or assume a jet from another model is equivalent. Confirm the engine, carburetor ID and existing jet markings for your exact Cushman Shuttle 2. For manufacturer documentation, visit the official manufacturer website.