Installing The Middle Drive Shaft; Measuring The Middle Gear Backlash - Yamaha YFM450FAR Service Manual

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MIDDLE GEAR
Install the bearing 1 onto the yoke.
G
CAUTION:
Check each bearing. The needles can
easily fall out of their races. Slide the yoke
back and forth on the bearings; the yoke
will not go all the way onto a bearing if a
needle is out of place.
G
Press each bearing into the U-joint using a
suitable socket.
NOTE:
The bearing must be inserted far enough into
the U-joint so that the circlip can be installed.
Install the circlips 2 into the groove of each
G
bearing.
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INSTALLING THE MIDDLE DRIVE SHAFT

1.Tighten:
Nut (middle drive pinion gear) 1
G
NOTE:
Secure the middle drive shaft in the vise with a
clean rag.
2.Lock the threads with a drift punch.
MEASURING THE MIDDLE GEAR
BACKLASH
1.Measure:
Gear lash
G
Middle gear lash:
0.1 ~ 0.3 mm (0.004 ~ 0.012 in)
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Measurement steps:
G
Temporarily install the right crankcase.
Wrap a rag 2 around a screwdriver 3, and
G
then insert it into the installation hole 1 of
the left crankcase speed sensor to hold the
middle driven gear.
4 - 87
ENG
New
130 Nm (13.0 m • kg, 94 ft • lb)