BOMBARDIER 1996 Ski-doo MX Z440 Handbook page 172

Section ENGINE PREPARATION
04
A01C2XS
1. E-ring
2. Needle jet
3. Fuel
4. Air
5. Metered here
6. Jet needle
7. Throttle valve
The jet needle raises and lowers with the throttle valve which changes jet needle position in the
needle jet. Because the jet needle is tapered from top to bottom, an increasing amount of fuel is
delivered through the needle jet whenever the throttle valve is raised. Increased or decreased air
flow, by the throttle valve position, regulates the amount of fuel through the needle jet and around
the jet needle.
The jet needle works on combination of length, taper, and E-ring position. Each jet needle has a
number and letter series stamped on the body.
04-70
2