Yamaha TDM850 User Manual page 42

Pistons
Piston diameter (measured 4.5 mm (TDM and TRX models) or 4.7
mm (XTZ models) up from skirt, at 90° to piston pin axis)
TDM and TRX models ................................................................................
XTZ models ................................................................................................
Piston-to-bore clearance ..............................................................................
Piston pin diameter ........................................................................................
Piston pin bore diameter in piston .................................................................
Piston pin-to-piston pin bore clearance ..........................................................
Piston rings
Top ring TDM and TRX
models
Ring width ..............................................................................................
Ring thickness .......................................................................................
Ring end gap (installed)
Standard ...........................................................................................
Service limit (max) .............................................................................
Piston ring-to-groove clearance
Standard ...........................................................................................
Service limit (max) .............................................................................
XTZ models
Ring width ..............................................................................................
Ring thickness ........................................................................................
Ring end gap (installed)
Standard ...........................................................................................
Service limit (max) .............................................................................
Piston ring-to-groove clearance
Standard ..........................................................................................
Service limit (max) .............................................................................
nd
2 (middle) ring 1991 to 1995
TDM models
Ring width ..............................................................................................
Ring thickness .......................................................................................
Ring end gap (installed)
Standard ..........................................................................................
Service limit (max) .............................................................................
Piston ring-to-groove clearance
Standard ...........................................................................................
Service limit (max) .............................................................................
1996-on TDM models and TRX models
Ring width ..............................................................................................
Ring thickness .......................................................................................
Ring end gap (installed)
Standard ...........................................................................................
Service limit (max) .............................................................................
Piston ring-to-groove clearance
Standard ...........................................................................................
Service limit (max) .............................................................................
XTZ models
Ring width ..............................................................................................
Ring thickness ........................................................................................
Ring end gap (installed)
Standard ..........................................................................................
Service limit (max) .............................................................................
Piston ring-to-groove clearance
Standard ..........................................................................................
Service limit (max) .............................................................................
Oil ring TDM and TRX
models
Ring width ..............................................................................................
Ring thickness .......................................................................................
Side-rail end gap (installed) ...................................................................
XTZ models
Ring width ..............................................................................................
Ring thickness ........................................................................................
Side-rail end gap (installed) ...................................................................
Engine, clutch and transmission 2*3
89.420 to 89.435 mm
86.920 to 86.935 mm
Standard Service Limit
0.065 to 0.085 mm 0.15 mm
19.991 to 20.000 mm 19.975 mm
20.002 to 20.013 mm 20.043 mm (max)
0.002 to 0.022 mm 0.07 mm
3.5 mm
1.0 mm
0.30 to 0.45 mm
0.70 mm
0.035 to 0.070 mm
0.12 mm
3.3 mm
1.0 mm
0.30 to 0.50 mm
0.70 mm
0.03 to 0.07 mm
0.12 mm
3.5 mm
1.0 mm
0.30 to 0.45 mm
0.70 mm
0.02 to 0.055 mm
0.12 mm
3.5 mm
1.0 mm
0.30 to 0.45 mm
0.70 mm
0.035 to 0.070 mm
0.12 mm
3.3 mm
1.0 mm
0.30 to 0.50 mm
0.70 mm
0.02 to 0.06 mm
0.12 mm
2.85 mm
2.0 mm
0.20 to 0.70 mm
2.80 mm
2.0 mm
0.20 to 0.70 mm