Yamaha YFM400FWA 2000 5GH3-AE1 Service Manual page 213

MIDDLE GEAR
Attach the gear lash measurement tool 2
and dial gauge 3.
Gear lash measurement tool:
P/N. YM-01467, 90890-01467
a 46 mm (1.8 in)
Measure the gear lash while rotating the
middle driven shaft back and forth.
NOTE:
Measure the gear lash at 4 positions. Rotate
the middle driven gear 90˚ each time.
If the gear lash is incorrect, adjust the gear
lash by middle driven pinion gear shims
and/or middle drive pinion gear shim(s).
*********************************
4 - 87
ENG