The following table is the shim stack for a 1989 YZ250.
I am making the assumption that the stack is the stock configuration
but I am not the original owner. The stock stack was for a 155 lb rider
with a 5.2 kg/mm spring. Dimensions are in inches.
Quantity |
Nut End Of Shaft |
Comments |
1 |
Nut |
This end considered up |
1 |
Backing Plate |
Check Valve |
2 |
.005 x 1.260 |
Check Valve |
2 |
.028 x .747 |
Washer |
1 |
.012 x .865 |
Shim High Speed Rebound |
1 |
.012 x .942 |
Shim High Speed Rebound |
1 |
.010 x 1.023 |
Shim High Speed Rebound |
1 |
.010 x 1.100 |
Shim High Speed Rebound |
1 |
.010 x 1.178 |
Shim High Speed Rebound |
4 |
.010 x 1.338 |
Shim High Speed Rebound |
1 |
.004 x .945 |
Shim Low Speed Rebound |
1 |
.010 x 1.338 |
Shim Low Speed Rebound |
Piston |
Port with raised inset goes down | |
6 |
.006 x 1.495 |
Shim Low Speed Compression |
1 |
.004 x 1.101 |
Shim Low Speed Compression |
1 |
.004 x .905 |
Shim Low Speed Compression |
1 |
.010 x 1.495 |
Shim High Speed Compression |
1 |
.010 x 1.416 |
Shim High Speed Compression |
1 |
.010 x 1.338 |
Shim High Speed Compression |
1 |
.010 x 1.259 |
Shim High Speed Compression |
2 |
.010 x 1.181 |
Shim High Speed Compression |
1 |
.010 x 1.124 |
Shim High Speed Compression |
1 |
.010 x 1.102 |
Shim High Speed Compression |
1 |
.010 x .905 |
Shim High Speed Compression |
1 |
Base |