
03-6
SECTION 03 - ENGINE PREPARATION
1. Pulse nipple
Material is of lightweight alloy to reduce overall
engine weight. Incorporated into crankcase de-
signs is a pulsation nipple (a tube connects the
pulsation nipple to the carburetor fuel pump to as-
sist with the fuel pumping cycle).
The engine crankcase serves 3 main functions:
1. Supports the crankshaft in perfect line bore.
2. Serves as a primary compression chamber for
incoming air/fuel mixture.
3. Supporting structure for the cylinders, arma-
ture plate, coils, etc.
Crankshaft
CRANKSHAFT SHOWN WITH CONNECTING RODS
The engine crankshaft is the backbone of the en-
gine. It converts the reciprocating movement of
the piston into rotary movement.
The crankshaft is supported by ball bearings
mounted inside the crankcase. It is finely ma-
chined to obtain precision journals and perfect
alignment. Distortion or out-of round will impair
the necessary free and smooth rotation.
Connecting Rod
The connecting rod links the piston to the crank-
shaft. Within each bored end of the rod is a needle
bearing. Rotax connecting rods are integral parts
of the crankshaft assembly and therefore, are not
removable unless crankshaft is disassembled
with special tooling. If you are unsure about the
condition of your crankshaft or if you know your
crankshaft needs to be worked on, it is highly sug-
gested that you send the crankshaft to a machine
shop specializing in this type of work.
1. Connecting rod length
F01D5SA
1
F01D1ND
F01D5TD
1
Summary of Contents for Bombardier
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