93
4-STROKE ENGINE SPECIFICATIONS
(BV – BVL – VANTAGE – PRISMA – SYNERGY – PREMIER – SPECTRA – FUTURA)
Engine displacement
cm
3
148
156
172
198
195
148
172
195
OHV
OHV
OHV
63.500
63.500
66.675
71.425
70.993
63.500
66.675
70.993
Boring
mm
63.525
63.525
66.700
71.450
71.018
63.525
66.700
71.018
Stroke
mm
47.1
49.2
49.2
49.2
47.1
49.2
49.2
Advance (P.M.S.)
FIXED
Coil – flywheel air gap
mm
0.30
0.30
0.30
0.30
0.30
0.30
0.30
Distance between
0.60
0.60
0.60
0.60
0.60
0.60
0.60
electrodes and spark plugs mm
0.70
0.70
0.70
0.70
0.70
0.70
0.70
Valve clearance
mm
0.15
0.15
0.15
0.15
0.05
0.05
0.05
(may also be 0.10÷0.20)
0.25
0.25
0.25
0.25
0.10
0.10
0.10
Valve seat angle
46°
46°
46°
46°
46°
46°
46°
Crank journal diameter
mm
21.869
25.387
25.387
25.387
21.869
25.387
25.387
21.882
25.400
25.400
25.400
21.882
25.400
25.400
Engine shaft toe diameter
25.362
25.362
25.362
25.362
25.362
25.362
25.362
(flywheel side)
mm
25.375
25.375
25.375
25.375
25.375
25.375
25.375
Engine shaft toe diameter
25.362
25.362
25.362
25.362
25.362
25.362
25.362
(power intake side)
mm
25.375
25.375
25.375
25.375
25.375
25.375
25.375
Engine shaft axial
0.155
0.155
0.155
0.155
0.155
0.155
0.155
clearance
mm
0.689
0.689
0.689
0.689
0.689
0.689
0.689
Piston skirt diamter
mm
63.383
63.383
66.520
71.298
70.866
63.383
66.520
70.866
63.395
63.395
66.530
71.310
70.891
63.395
66.530
70.891
Distance between
0.178
0.178
0.178
0.25
0.178
0.178
0.25
compression ring points
mm
0.432
0.432
0.432
0.50
0.432
0.432
0.50
Crankshaft bearing diameter
25.413
25.413
25.413
25.413
25.413
25.413
25.413
(flywheel side)
mm
25.425
25.425
25.425
25.425
25.425
25.425
25.425
Crankshaft bearing diameter
25.413
25.413
25.413
25.413
25.413
25.413
25.413
(power intake side)
mm
25.425
25.425
25.425
25.425
25.425
25.425
25.425
Inlet valve guide diameter
mm
6.355
6.355
6.355
6.337
6.355
6.382
6.382
6.382
6.387
6.382
Exhaust valve guide
6.303
6.303
6.303
6.337
6.303
diameter
mm
6.331
6.331
6.331
6.387
6.331
Inlet valve diameter
6.312
6.312
6.312
6.312
(may also 6.261÷6.274)
mm
6.325
6.325
6.325
6.325
Exhaust valve
6.197
6.197
6.197
6.197
diameter
mm
6.210
6.210
6.210
6.210
Valve seat
1.32
1.32
1.32
1.32
diameter
mm
1.07
1.07
1.07
1.07
1
st
and 2
nd
retaining ring
0.05
0.05
0.05
0.05
0.05
0.05
0.05
side clearance
mm
0.125
0.125
0.125
0.125
0.125
0.125
0.125
Oil scraper ring side
0.025
0.025
0.025
0.025
0.025
0.025
0.025
clearance
mm
0.10
0.10
0.10
0.10
0.10
0.10
0.10
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