5
9850064 R03 - 2021 650 / 850 Matryx Trail Performance / Crossover Snowmobile Service Manual
© Copyright Polaris Inc.
5.21
FUEL RAIL / FUEL INJECTOR
INSTALLATION
IMPORTANT
Use Digital Wrench to reset the fuel injector break-in
timer when new fuel injectors are installed on the
engine, see Fuel Injector Break-In Timer Reset page
1.55.
WARNING
Gasoline is extremely flammable and explosive under
certain conditions. Do not smoke or allow open flames
or sparks in or near the fuel tank / fuel system.
NOTICE
The fuel rail, micro-dampers, and fuel hoses attached to
the rail are not serviceable.
IMPORTANT
Do not touch fuel injector inlets / outlets. Leave
protective caps in place while handling.
NOTICE
Fuel rail fasteners must be replaced each time they are
removed or loosened.
1. To reassemble fuel injectors, install a new blue O-ring
q
, new green O-ring
w
, and new rubber bushing
e
on each fuel injector. Apply a light film of engine oil on
the rubber bushings and O-rings.
NOTICE
Note the rubber bushings are installed cone-side into
bore.
2. Carefully pass the MAG fuel injector harness lead
r
between the fuel supply and return fittings.
NOTICE
Note that the fuel injector harness is secured to the
throttle body at the white tape marks with routing clips /
cable ties.
3. Install both fuel injectors / harness and fuel rail
assembly.
IMPORTANT
Do not damage the rubber bushings during injector
installation.
4. Install new fuel rail mounting fasteners
o
. Hand-
tighten the fasteners evenly. Once both fasteners are
seated, torque to specification.
TORQUE
Fuel Rail Fasteners:
First Pass: 5 ft-lbs (6.5 N·m)
Second Pass: 15 ft-lbs (20 N·m)
FUEL SYSTEM
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