SECTION 05 - ENGINE PREPARATION
MMC2005-001_05A.FM
05-19
b. To determinate the
fully closed
position of
the air screw, turn the air screw slightly. Ex-
cessive tightening of the air screw would
damage the seat. The position where the air
screw comes to a stop should be considered
the
fully closed
position. The maximum
number of turns in the opening of the air
screw must be limited to 3.0. If the air screw
is opened over 3.0 turns, the spring will not
work and the air screw can come off during
operation of the vehicle.
Replacing Pilot Jet
1. Pilot jet
1. Total amount of fuel flow
2. Main fuel system
3. Pilot fuel system
Pilot jets are numbered from no. 15 (the smallest)
to no. 80 (the largest). The number corresponds to
fuel flow and not necessarily to drill size or
through-hole diameter. After changing the pilot jet,
check and adjust air screw as described above.
NOTE:
Since the pilot/air system provides some
fuel up to wide open throttle, changes in this sys-
tem will affect the throttle valve, jet needle/needle
jet, and main jet metering systems.
Throttle Valve
PRINCIPLES OF OPERATION
1. Throttle valve
2. 3.0
3. 2.0
The throttle valve is cut away on the air inlet side
to help control the fuel/air mixture at low and in-
termediate throttle settings. The size of cut-away
also affects acceleration.
Throttle valves are numbered from 0.5 to 4.5 in 0.5
increments based on the size of the cut-away. The
most commonly used configurations are 1.5 to
3.5. The higher the number, the greater the cut-
away and the larger the air flow.
The throttle valve functions in about the same
range as the pilot/air system. After the air screw
is adjusted, it can be used to check the throttle
valve selection.
NOTE:
Too lean of a slide cut-away can cause pis-
ton seizures during sudden throttle closures from
large throttle settings.
A01C4GA
1
A01C4HA
Throttle valve opening (%)
Fuel flow
1
2
3
A01C2VA
1
2
3
Содержание ski-doo MACH Z 1000 SDI
Страница 1: ...Mmc 2005 001 Racing FH8 Wed Sep 15 15 27 01 2004 Page 1 C M Y CM MY CY CMY K...
Страница 118: ...04 36 MMC2005 001_04A FM SECTION 04 SUSPENSION SC 3 SC 4 RAS SC IV REAR SUSPENSION 0...
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Страница 196: ...05 72 MMC2005 001_05A FM SECTION 05 ENGINE PREPARATION FUEL TANK AND FUEL PUMP All Models except SDI 2 4 3 1 A33C2VS...
Страница 289: ...SECTION 06 DRIVE SYSTEM MMC2005 001_06A FM 06 27 422 A01D3JA 417 222 562 427 A01D3KA 417 222 677...
Страница 473: ...SECTION 12 SERVICE TOOLS MMC2005 001_12A FM 12 29 N Scratch remover P N 861 774 800 APPLICATION All models...
Страница 476: ...MMC2005 001_13A FM 13 1 SECTION 13 ACCESSORIES TABLE OF CONTENTS 0 ACCESSORIES 13 02...
Страница 493: ...Mmc 2005 001 Racing FH8 Wed Sep 15 15 27 01 2004 Page 1 C M Y CM MY CY CMY K...