Tracker Off-Road XTR1000 Service Manual page 49

NOTE: The numbers stamped into the crankshaft

web and the numbers stamped into the lower crank-
case are used to determine the replacement crank-
shaft journal bearing sizes.
SNO-686
SNO-687
SNO-685
NOTE: "J1 - J4" refer to the bearings shown in the

crankshaft web and lower crankcase illustration. If
"J1 - J4" are the same, use the same size for all of the
bearings.
For example: if the crankcase "J1" and crankshaft web
"J1" numbers are "6" and "1" respectively, the bearing
size for "J1" is: J1 (crankcase) – J1 (crankshaft web) + 2
= 6 – 1 + 2 = 7.
48
CRANKSHAFT JOURNAL BEARING COLOR CODE
2
3
4
5
6
7
8
PISTON ASSEMBLY
SNO-862
 NOTE: Whenever a piston, rings, or pins are out of
tolerance, they must be replaced.
Cleaning/Inspecting Piston
1. Using a non-metallic carbon removal tool, remove
any carbon buildup from the dome of the piston.
2. Inspect the piston for cracks in the piston pin, dome,
and skirt areas.
3. Inspect the piston for seizure marks or scuffing.
NOTE: If seizure marks or scuffing is detected, the

piston must be replaced.
4. Inspect the perimeter of each piston for signs of
excessive "blowby." Excessive "blowby" indicates
worn piston rings or an out-of-round cylinder.
Removing Piston Rings
1. Starting with the top ring, slide one end of the ring
out of the ring groove.
2. Remove each ring by working it toward the dome of
the piston while rotating it out of the groove.
Black
Brown
Green
Yellow
Pink
Red
White