Tracker Off-Road XTR1000 Service Manual page 47

NOTE: Make a note of the position of each valve

lifter and valve pad so that they can be reinstalled in
their original place.
4. To select the correct replacement shim for an
out-of-specification clearance, note the three-digit
number on the surface of the existing shim; then
refer to the appropriate Tappet Shim Selection Table
(Exhaust or Intake) in this sub-section and use this
procedure:
A. Find the Measured Tappet Clearance (from step
3) in the left-side vertical column of the table.
B. Find the Present Shim Size (three-digit-number)
at the top-side horizontal column of the table.
C. Match the clearance in the vertical column with
the present shim size to obtain the recommended
replacement shim.
5. After verifying proper valve/tappet clearance, install
the timing inspection plug to the magneto case and
tighten securely.
CONNECTING ROD BIG END BEARING
 NOTE: Do not interchange the big end bearings and
connecting rods. To obtain the correct crank-
shaft-pin-to-big-end-bearing clearance and prevent
engine damage, the big end bearings must be installed
in their original positions.
1. Clean the big end bearings, crankshaft pins, and
bearing portions of the connecting rods.
2. Install the big end upper bearing into the connecting
rod and the big end lower bearing into the connecting
rod cap.
NOTE: Align the projections on the big end bear-

ings with the notches in the connecting rod and con-
necting rod cap.
SNO-298
3. Put a piece of Plastigauge® (A) on the crankshaft
pin; then install the connecting rod halves.
46
SNO-854
NOTE: Do not move the connecting rod or crank-

shaft until the clearance measurement has been com-
pleted. Apply molybdenum disulfide oil onto the bolt,
threads, and seats.
4. Make sure that the "Y" mark (A) on the connecting
rod faces toward the right side (AC magneto rotor
side) of the crankshaft.
5. Make sure that the characters (B) on both the con-
necting rod and connecting rod cap are aligned.
SNO-855
6. Tighten the connecting rod cap screws; then remove
the connecting rod and big end bearings. Measure
the compressed Plastigauge® width (A) on the
crankshaft pin.
SNO-659
7. Select the big end bearings (P1-P3).