3
57
ENGINE CHECKS AND ASSEMBLY
EXPLODED VIEW OF INTERNAL GEARBOX CONTROL
UNIT:
13) 1st - 4th fork;
14) 5th-6th fork;
15) bush;
16) fork pin;
18) desmodromic control
3.4.4 CHECKING THE FORKS,
FORK PINS AND DESMO-
DROMIC DEVICE
The internal gearshift is made up of:
• two forks 13 which drive two gears on the sec-
ondary unit;
• one fork 14 which drives one gear on the primary
unit;
• three guide pin bushes 15;
• two fork pins 16;
• desmodromic gearshift 18 whose rotation drives
the forks thus selecting the desired gear.
Check to make sure that the guide pins that support
the bushes 15 have no traces of meshing or abnor-
mal wear and that the bushes are not worn.
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