Section 04
ENGINE
Sub-Section 02
(TOP END)
04-02-2
ENGINE DESCRIPTION
The 2-stroke ROTAX engine rotates counterclock-
wise seen from the rear (PTO flywheel). It has a
rotary valve to control fuel mixture intake. Lubrica-
tion is provided by a variable oil injection pump. It
is cooled by water supplied from the jet pump. It
has a NIPPONDENSO Capacitor Discharge Igni-
tion System. The fuel is provided by diaphragm
MIKUNI carburetor having an integrated fuel
pump.
CAUTION : No engine components can
be interchanged between engines.
GENERAL
When repairing a seized engine, connecting rods
should be checked for straightness and crank-
shaft for deflection / misalignment. Refer to BOT-
TOM END for procedures.
DISASSEMBLY
In order to repair engine top end proceed as fol-
lowsþ:
Electrical Connections
Refer to ENGINE REMOVAL AND INSTALLATION
04-01, then look for
Electrical Connections
.
Exhaust System
To withdraw tuned pipe, refer to ENGINE RE-
MOVAL AND INSTALLATION 04-01, then look for
Tuned Pipe Removal
.
Intake System
To remove air intake silencer, refer to ENGINE RE-
MOVAL AND INSTALLATION 04-01, then look for
Air Intake Silencer Removal
.
1,2, Cylinder Head Cover and Cylinder
Head
Remove cylinder head cover.
If shells, sand, salt or any other particles are
present in cylinder head, clean with a vacuum
cleaner.
Remove cylinder head.
If shells, sand, salt water or any other particles are
present in cylinder cooling jacket, clean with a
vacuum cleaner.
Remove cylinders, being careful that connecting
rods do not hit crankcase edge.
WARNING : If screws need to be heated
for removal when engine is in jet boat,
fuel system pressurization must be done first.
Do not use open flameþ;þuse a heat gun. An
explosion might occur since vapors can be
present in engine compartment.
NOTE :
Even if only 1 cylinder needs repair,
both cylinders should be lifted to allow 1-
piece cylinder base gasket replacement.
3,4,5,6, Piston, Piston Pin, Circlip and
Roller Bearing
NOTE :
These engines feature cageless pis-
ton pin bearing.
Bring piston to Top Dead Center and install rubber
pad (P / N 295 000 101) over crankcase opening.
Secure with screws. Lower piston until it sits on
pad.
1. Rubber pad
If other cylinder has been removed, completely
cover its opening with a clean rag.
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;
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F01B0JA
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Содержание Challenger 5896
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Страница 152: ...Section 08 ELECTRICAL Sub Section 03 IGNITION SYSTEM 08 03 2 ELECTRICAL BOX Sportster F04H11S ...
Страница 154: ...Section 08 ELECTRICAL Sub Section 03 IGNITION SYSTEM 08 03 4 ELECTRICAL BOX Speedster F04H26S ...
Страница 251: ...Section 11 HULL DECK Sub Section 01 COMPONENTS 11 01 5 F04L3IS Loctite 242 ...
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