Profile
Number

Advertised Timings

DURATION

VALVE LIFT

TAPPET
CLEARANCE

REMARKS

Ex Op.
B.B.D.C.

Ex Cl
A.T.D.C

In Op.
B.T.D.C.

In Cl
A.B.D.C

Advertised

@ 0.050”

Gross.

@ T.D.C.

Ex.

In.

663

64

32

68

28

276

276

0.420”

0.420”

0.008”

0.006”

Standard XT 250cc

506

80

32

44

68

292

292

0.370”

0.370”

0.008”

0.006”

Standard XT 500cc

755

78

40

45

73

298

298

0.420”

0.400”

0.008”

0.006”

1^st Imp. 250cc

577

66

39

41

64

285

285

0.450”

0.450”

0.010”

0.008”

2^nd

Imp.250cc

503

86

36

44

76

302

300

0.460”

0.460”

0.010”

0.008”

Mild road 500cc

323

70

50

46

76

300

300

0.455”

0.455”

0.012”

0.010”

468C

82

52

52

82

314

314

0.465”

0.465”

0.012”

0.010”

Road race.