1999 YAMAHA YZF-R7 Owners Manual

4 - 77
ENGCRANKSHAFT
g. Remove the lower crankcase and the
crankshaft journal lower bearings.
h. Measure the compressed Plasti-
gauge
Ò width c on each crankshaft
journal.
If the clearance is out of specification,
select replacement crankshaft jour-
nal bearings.
s s s s s s s s s s s s s s s s s s s s s s s s s s s
2. Select:
• crankshaft journal bearings (J
1 ~ J5)
NOTE:
• The numbers stamped into the crank-
shaft web and the numbers stamped
into the lower crankcase are used to
determine the replacement crankshaft
journal bearing sizes.
•“J
1” ~ “J5” refer to the bearings shown
in the crankshaft illustration.
• If “J
1” ~ “J5” are the same, use the
same size for all of the bearings.
t t t t t t t t t t t t t t t t t t t t t t t t t t t
For example, if the crankcase “J1” and
crankshaft web “J
1” numbers are “8”
and “3” respectively, then the bearing
size for “J
1” is:
s s s s s s s s s s s s s s s s s s s s s s s s s s s
Bearing size for J1:
“J
1” (crankcase) – “J1” (crankshaft
web) =
8 – 3 = 5
CRANKSHAFT JOURNAL BEARING
COLOR CODE
1
blue
2
3
black
4
5
brown
6
7
green
8
9
yellow
10
11 violet

4 - 78
ENGCRANKSHAFT
EB412720
INSTALLING THE CRANKSHAFT
1. Install:
• crankshaft journal upper bearings
(into the upper crankcase)
NOTE:
• Align the projections a on the crank-
shaft journal upper bearings with the
notches b in the upper crankcase.
• Be sure to install each crankshaft jour-
nal upper bearing in its original place.

ENG
4 - 79
TRANSMISSION
EB413000
TRANSMISSION
Order Job/Part Q’ty Remarks
Removing the transmission, shift
drum assembly, and shift forksRemove the parts in the order listed.
Crankcase Separate.
Refer to “CRANKCASE”.
Stopper lever Refer to “SHIFT SHAFT”.
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
7 Spring 4
8 Shift fork “L” 1
9 Shift fork “R” 1

ENG
4 - 80
TRANSMISSION
Order Job/Part Q’ty Remarks
10 Shift drum assembly 1
11 Shift fork “C” 1
12 Main axle assembly 1
For installation, reverse the removal
procedure.

ENG
4 - 81
TRANSMISSION
Order Job/Part Q’ty Remarks
Disassembling the main axle assem-
blyRemove the parts in the order listed.
1 2nd pinion gear 1
2 Toothed lock washer 1
3 Toothed lock washer retainer 1
4 6th pinion gear 1
5 Toothed spacer 1
6 Toothed washer 2
7 Circlip 2
8 3rd/4th pinion gears 1
9 5th pinion gear 1
@ Collar 1

ENG
4 - 82
TRANSMISSION
Order Job/Part Q’ty Remarks
A Main axle/1st pinion gear 1
B Bearing 1
C Main axle bearing housing 1
For installation, reverse the removal
procedure.

ENG
4 - 83
TRANSMISSION
Order Job/Part Q’ty Remarks
Disassembling the drive axle assem-
blyRemove the parts in the order listed.
1 Washer 1
2 1st wheel gear 1
3 Spacer 1
4 5th wheel gear 1
5 Circlip 3
6 Washer 3
7 3rd wheel gear 1
8 Toothed spacer 2
9 Toothed lock washer 1
@ Toothed lock washer retainer 1

ENG
4 - 84
TRANSMISSION
Order Job/Part Q’ty Remarks
A 4th wheel gear 1
B 6th wheel gear 1
C 2nd wheel gear 1
D Spacer 1
E Drive axle 1
F Bearing 1
G Spacer 1
For installation, reverse the removal
procedure.