BOMBARDIER 1996 Ski-doo MX Z440 Handbook page 139

, AOOB2ES
Dial indicator (P/ N 4141047 00)
o
NOTE : Do not use crankshaft locking tool to find out MAGneto side top dead center.
It will not give the right position on some engines.
A degree wheel (P/N 4143529 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.
, AOOB33S
For the following instructions, let's use these specifications as an example :
OPENING : 132° BTDC
CLOSING : 52° BTDC
Proceed as follows:
— For opening mark, first align 360° line of degree wheel with BOITOM of MAGneto
port. Then find 132° line on degree wheel and mark crankcase at this point.
Section ENGINE PREPARATION
04
side inlet
04-37