Section 04 ENGINE
Sub-Section 09 (ROTARY VALVE, COOLANT PUMP AND RESERVOIR)
04-09-6
18,19, Pump Housing Bolt and Loctite
242 (Blue)
Apply Loctite 242 (blue) on bolt threads.
ROTARY VALVE TIMING
At disassembly, before removing rotary valve,
note original rotary valve timing : it may be out of
specifications by 1 to 4 degrees of retard or ad-
vance. To do so bring MAG piston to TDC and
scribe a mark on crankshaft end at top (12 o’clock)
and also on upper crankcase half.
Mark position of rotary valve shaft gear in relation
to upper crankcase.
1. Mark here
2. MAG piston at TDC
After removing rotary valve shaft but before disas-
sembling, mark brass gear in relation to shaft.
1. Mark here
These marks will be useful to time rotary valve ex-
actly to the specifications.
NOTE : Tolerance of rotary valve timing is
± 5 degrees.
When the same crankcase is reassembled, the
first timing method is to be followed. However
since replacement crankcases do not have timing
marks (ridge), the second method is required.
Take note that the second method is more accu-
rate and may be used any time.
Installation
To correctly install rotary valve, proceed as
follows :
– )Turning crankshaft, bring MAGneto side pis-
ton to Top Dead Center.
Use a dial indicator (P / N 414 1047 00).
A degree wheel (P / N 414 3529 00) is required to
measure rotary valve opening and closing angles
in relation with MAGneto side piston. Degree
wheel will be installed on rotary valve shaft for
measurements.
Rotary valve must be set as specified in TECHNI-
CAL DATA 10.
For the following instructions, use these specifi-
cations as example :
OPENING : 132° BTDC
CLOSING : 52° BTDC
Proceed as follows :
A16C16A
1
2
1
A00B2EA
414 1047 00
3
6
0
3
5
0
3
4
0
3
3
0
3
2
0
3
1
0
3
0
0
2
9
0
2
8
0
2
7
0
2
6
0
2
5
0
2
4
0
2
3
0
2
2
0
2
1
0
2
0
0
1
9
0
1
8
0
1
7
0
1
6
0
1
5
0
1
4
0
1
3
0
1
2
0
1
1
0
1
0
0
9
0
8
0
7
0
6
0
5
0
4
0
3
0
2
0
1
0
1
0
2
0
3
0
4
0
5
0
6
0
7
0
8
0
9
0
1
0
0
1
1
0
1
2
0
1
3
0
1
4
0
1
5
0
1
6
0
1
7
0
1
8
0
1
9
0
2
0
0
2
1
0
2
2
0
2
3
0
2
4
0
2
5
0
2
6
0
2
7
0
2
8
0
2
9
0
3
0
0
3
1
0
3
2
0
3
3
0
3
4
0
3
5
0
3
6
0
A00B33A
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