Yamaha Fz6 N Service Manual

CRANKSHAFT
5-70
9. Tighten: Connecting rod bolts
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CAUTION:
ECA14980
Tighten the connecting rod bolts using the 
plastic-region tightening angle method.
a. Clean the connecting rod bolts.
b. Tighten the connecting rod bolts.
c. Put a mark “1” on the corner of the con-
necting rod bolt “2” and the connecting rod 
cap “3”.
d. Tighten the bolt further to reach the speci- fied angle (120 °).
e. After the installation, check that the section  shown “a” is flush with each other...

CRANKSHAFT
5-71
Out of specification → Replace the crank-
shaft journal bearings.
CAUTION:
ECA4S81028
Do not interchange the crankshaft journal 
bearings. To obtain the correct crankshaft 
journal- to-crankshaft-journal-bearing 
clearance and prevent engine damage, the 
crankshaft journal bearings must be 
installed in their original positions.
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a. Clean the crankshaft journal bearings, 
crankshaft journals, and bearing portions of 
the crankcase.
b. Place the upper...

CRANKSHAFT
5-72
Refer to CRANKCASE on page 5-55.
g. Remove the lower crankcase and the crankshaft journal lower bearings.
h. Measure the compressed Plastigauge®  width “c” on each crankshaft journal.
If the crankshaft-journal-to-crankshaft-jour-
nal-bearing clearance is out of specifica-
tion, select replacement crankshaft journal 
bearings.
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2. Select: Crankshaft journal bearings (J1–J5)
NOTE:
 The numbers “A” stamped into the crank-shaft web and the numbers “1” stamped...

CRANKSHAFT
5-73
NOTE:
 Align the projections “a” on the crankshaft journal upper bearings with the notches “b” in 
the upper crankcase.
 Be sure to install each crankshaft journal 
upper bearing in its original place.
2. Install:  Crankshaft
3. Install:  Lower crankcase Refer to CRANKCASE on page 5-55. 

TRANSMISSION
5-74
EAS26240
TRANSMISSION
Removing the transmission, shift drum assembly, and shift forks
Order Job/Parts to remove Q’ty RemarksLower crankcase 1 Refer to CRANKCASE on page 5-55.
1 Drive axle assembly 1
2 Circlip 1
3 Oil seal 1
4 Bearing 1
5 Shift drum retainer 1
6 Shift fork guide bar 2
7Spring 4
8 Shift fork-L 1
9 Shift fork-R 1
10 Shift drum assembly 1
11 Shift fork-C 1
12 Main axle assembly 1
13 Oil pipe 1
14 Oil baffle plate 1
15 Thrust plate 1
16 Washer 1 For installation, reverse...

TRANSMISSION
5-75
Disassembling the main axle assembly
Order Job/Parts to remove Q’ty Remarks1 Bearing 1
2 2nd pinion gear 1
3 Toothed lock washer 1
4 Toothed lock washer retainer 1
5 6th pinion gear 1
6 Collar 1
7 Washer 1
8 Circlip 1
9 3rd pinion gear 1
10 Circlip 1
11 Washer 1
12 5th pinion gear 1
13 Collar 1
14 Main axle 1
15 Bearing housing 1
16 Bearing 1 For installation, reverse the removal proce-
dure. 

TRANSMISSION
5-76
Disassembling the drive axle assembly
Order Job/Parts to remove Q’ty Remarks1 Washer 1
2 1st wheel gear 1
3 Collar 1
4 5th wheel gear 1
5 Circlip 1
6 Washer 1
7 Collar 1
8 3rd wheel gear 1
9 Toothed lock washer 1
10 Toothed lock washer retainer 1
11 4th wheel gear 1
12 Collar 1
13 Washer 1
14 Circlip 1
15 6th wheel gear 1
16 Circlip 1
17 Washer 1
18 2nd wheel gear 1
19 Collar 1
20 Collar 1
21 Oil seal 1
22 Bearing 1
23 Circlip 1
24 Drive axle 1 

TRANSMISSION
5-77
For installation, reverse the removal proce-
dure.
Disassembling the drive axle assembly
Order Job/Parts to remove Q’ty Remarks 

TRANSMISSION
5-78
EAS26250
REMOVING THE TRANSMISSION
1. Remove: Main axle assembly “1”
(with the Torx® wrench)
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a. Insert two bolts “2” of the proper size, as  shown in the illustration, into the main axle 
assembly bearing housing.
b. Tighten the bolts until they contact the  crankcase surface.
c. Continue tightening the bolts until the main 
axle assembly comes free from the upper 
crankcase.
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EAS26260
CHECKING THE SHIFT FORKS
The following...

TRANSMISSION
5-79
EAS26300
CHECKING THE TRANSMISSION
1. Measure: Main axle runout
(with a centering device and dial gauge “1”)
Out of specification  → Replace the main 
axle.
2. Measure:  Drive axle runout (with a centering device and dial gauge “1”)
Out of specification  → Replace the drive 
axle.
3. Check:  Transmission gears Blue discoloration/pitting/wear  → Replace 
the defective gear(s).  Transmission gear dogs
Cracks/damage/rounded edges  → Replace 
the defective gear(s).
4. Check: ...