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Rubber intake socket
part number 867-484
This socket fits the 377/447/503 Rotax engines equipped with
the Bing carb. It is a regular maintenance item and should be
replaced at the first sign of cracking.
For longer life, where possible support back of carb(s) and
breather. Prior to installation clean socket with acetone,
install socket(s) with arrow pointing towards engine, tighten
but do not over tighten clamps. Coat exposed area with
dielectric grease, this will lubricate socket and help prevent
UV deterioration. |
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Rotax intake socket 377, 447,
503 |
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Rotax 503 fan belt Rotax engines |
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Click here for more information on
fan belt, fan belt tools and adjustment. |
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 Dual
fuel pump 994 485
It is recommended that all Rotax engines use the dual fuel pump
supplied by ROTAX. There is a
difference between the pump used in snowmobile/motorcycle/seadoo
and aircraft.
When using the pump on a single carb engine "T" the two lines
together. Make sure to isolate the fuel pump from heat and
vibration.
The pulse line should be no longer than 12 inches Pumps should not
have to lift fuel any more than 24 inches.
Click here for more information!
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Rotax aircraft engine parts |
 Points
- 2 sets required, replace as necessary if found worn, or damaged.
Remember to lubricate phenolic blocks.
Check point gap within 10 hours
of new point installation, and ignition timing.
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 Condensers
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2 required, replace as necessary if found to be damaged, oil soaked, loose fitting or
defective.
Threaded #964 219
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NGK Spark BR8ES plugs
The proper spark plug for use in
most of the Rotax engines is the NGK B8ES, or other brand name
equivalent, (Champion spark plugs are not recommended, nor are
they factory authorized for ultralight
use.)
If using a spark plug with an BR
in its heading, (usually used for ignition noise suppression) such
as NGK BR8ES, a resistor cap should not be used. This is because
of the double resistance supplied when using both a resistor plug
and resistor cap. It is advisable with engines running in the
inverted position to use a spark plug with an extended electrode.
This aids in stopping spark plug fowling. Look for a BP in its
heading (NGK BP 8ES).
When removing or installing the
spark plug cap make sure that the cap is turned, in the rotation
necessary to tighten the screw on cap on top of the spark plug,
otherwise the improper removal of the cap results in the backing
off of the screw on cap and the possible loss of spark to the
engine, when the spark plug cap falls off.
Also see resistor plugs vs. resistor caps!
The recommended gap on the spark
plugs is .015 to .019 of an inch. These plugs are capable of running for
over 20 hours trouble free on a points and condenser engine and up
to 50 hours trouble free on a dual CDI ignition engine (if proper
fuel and oil are used and the engine is in proper tune). They
should be checked on a regular basis however, and replaced at the
first sign of a miss or after severe flooding of the engine.
If using a cylinder head temp
gauge, removal of the ring on the bottom of the spark plug is
recommended, since the gauge sending unit replaces it. (Cylinder
head temperatures should range in the 300 to 400 degree F range.)
In practice, a properly tuned
engine should show a nice chocolate, or brown color on the spark
plug, white indicates an engine running hot, while black indicates
one running to rich. Any sign of aluminum on the spark plug
indicates a problem of a very serious nature, and requires your
immediate attention! |
Electronic box assembly
3-6 966 462 7-9
966 467 |
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Rotax ignition coil for Rotax aircraft engines
PART #984 555A regular replacement item. Suggested
replacement every 150 hours, or at the first sign of coil failure.
When installing new coils on twin cylinder engines note coils are wired #1 coil is pole 1
to ground while 15 is to points. #2 coil is wired 1 to points and
15 to ground.
When routing ground wire lay it flat against coil so wire does not
bend back and forth in the wind-which could cause wire failure and
loss of ground.
Also make sure bolts are reinstalled using blue Loctite, or they
will come out - these holes use self tapping bolts, without
Loctite they will come loose, causing loss of ground, which will
result in loss of ignition, or or coil.
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Rotax Circlip all Rotax
2 stroke |
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Rotax Pistons |
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503 Standard Rotax Piston
with rings |
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1st over503 Rotax Piston
with rings |
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503 2nd over Rotax Piston
with rings |
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Rotax Rings |
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Rotax Gasket Sets |
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994-861 Rotax Gasket Set
503 before serial #3786750 |
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994-864 Rotax Gasket
Set 503 after serial #3786750 |
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994-236 Rotax 503 Ducati
Gasket Set |
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Rotax Factory NEW Crankshafts |
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996-441 Rotax 503 Ducati
Crankshaft |
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996-471 Rotax 503 Pro 8
Points Crankshaft |
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886-445 Rotax 503 Points
Crankshaft |
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