KTM 450 EXC-F 2017 Repair Manual page 196

18
ENGINE
194
»
If the end gap is greater than the specified value:
Check/measure the cylinder.
( e:!
p. 190)
If cylinder wear lies with in the specified tolerance:
Change the piston ring.
Mount the piston ring with the marking facing upward.
18.4.18 Measuring the piston/cylinder mounting clearance
310060-10
001678-10
18.4.19 Checking the oil pumps
Info
(All 450 models)
Check/measure the cylinder.
( 0
p. 190)
Check/measure the piston.
(e;!
p. 191)
The smallest piston/cyl inder mounting clearance equals the smal lest cylinder
bore diameter minus the largest piston d iameter. The largest piston/cylinder
mounting clearance equals the largest cylinder bore diameter minus the small -
est piston diameter.
Guideline
Piston/cylinder- mounting clearance
Size I
0.040 . .. 0.082 mm (0.00157 ...
0.00323 in)
Size II 0.043 ... 0.085 mm (0.00169 ...
0.00335 in)
Wear limit 0.120 mm (0.00472 in)
(All 500 models)
Check/measure the cylinder.
(0
p. 190)
Check/measure the piston.
(e;!
p. 191)
The smallest piston/cyl inder mounting clearance equals the smal lest cylinder
bore diameter minus the largest pi ston d iameter. The largest piston/cylinder
mounting clearance equals the largest cylinder bore diameter minus the small-
est piston diameter.
Guideline
Piston/cylinder- mounting clearance
Size I
0.040 ... 0.082 mm (0.00157 ...
0.00323 in)
Size II 0.043 . .. 0.085 mm (0.00169 ...
0.00335 in)
Wear limit 0.120 mm (0.00472 in)
The following steps apply to both oil pumps.
001683-10
Use special tool
0
to measure the play between the external rotor and the engine
case.
I
Feeler gauge (59029041100)
(0
p. 364)
Oil pump
External rotor/engine case clear-
ance
I
~
0.20 mm
(~ 0.0079 in)
»
If the measured value does not meet specifications:
Change the oil pump and, if necessary, the engine case.