Section 03
ENGINE
Sub-Section 03
(454, 494, 583 AND 670 ENGINE TYPES)
03-03-5
NOTE:
The following procedures can be
done without removing the engine from
chassis.
CLEANING
Discard all gaskets and O-rings.
Clean all metal components in a non-ferrous met-
al cleaner.
Scrape off carbon formation from cylinder ex-
haust port, cylinder head and piston dome using a
wooden spatula.
NOTE:
The letters “AUS” (over an arrow on
the piston dome) must be visible after clean-
ing.
Clean the piston ring groove with a groove cleaner
tool, or with a piece of broken ring.
DISASSEMBLY
Place a clean cloth over crankcase then with a
pointed tool inserted in piston notch, remove cir-
clip
no. 20
from piston
no. 21
.
To remove piston pin
no. 19
, use piston pin puller
(P/N 529 0290 00) as follows:
– Fully screw puller handle.
– Insert puller end into piston pin.
– Install adaptor (P/N 529 0236 00) then screw
extracting nut (LH threads).
– Hold puller firmly and rotate puller handle coun-
terclockwise to pull piston pin.
NOTE:
0.25 mm oversize piston and rings
are available if necessary except for 454 en-
gine.
RAVE System
NOTE:
RAVE stands for Rotax Adjustable
Variable Exhaust.
Remove spring clip
no. 3
, cover
no. 5
and spring
no. 6
.
Cut clamp
no. 8
(remove spring on 454) and un-
screw valve piston
no. 7
.
Spread clamp
no. 10
(except 454) and remove
bellows
no. 9
.
Remove cylindrical screws
no. 11
and their wash-
ers
no. 12
then valve rod housing
no. 13
.
Pull out exhaust valve
no. 16
.
1. Exhaust valve
INSPECTION
Refer to ENGINE DIMENSIONS MEASUREMENT 03-
04.
RAVE System
Check valve rod housing and cylinder for clogged
passages.
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A01B1AA
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A03C1PA
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