Main Jet System - BOMBARDIER 1996 Ski-doo MX Z440 Handbook

o
NOTE : Needle jets carrying the numbers 166, 159 or 169 in addition to the P-2 or P-4
and are not interchangeable. Be sure correct needles are used as specified for your snowmobile.

MAIN JET SYSTEM

PRINCIPLES OF OPERATION
, A01C30S
1. Jet needle
2. Metered here
3. Fuel
4. Air
5. Needle jet
The main jet system starts to function when the throttle is approximately 1/4 open. The mid range
fuel is supplied by the main jet and regulated by the needle jet/jet needle combination. The main
jet meters the fuel when the throttle is in the wide open position.
The main jets are available in sizes from number 50 to number 840. The size number corresponds
to flow and not necessarily to hole size.
When experiencing erratic operation or overheating, check the main jet for dirt which can plug the
orifice.
Section ENGINE PREPARATION
04
04-75