page 157
PARTS
OMC
OMC
PISTONS
INSERT PART NUMBER IN BOX
AT TOP OF PAGE TO OBTAIN PRICING.
PRO 1900 Series
PRO 5000 Series
PART NUMBER
EXPLANATION
3173P2
The first two numbers are
always 31.
The second two numbers
are the piston number, in this
case it is 73.
The letter is "P" for Port or "S"
for Starboard.
The last number is the size.
This is a .020" oversize.
Model
Cyl
Piston
Bore
PRO
PRO-V
PRO-HP
Wiseco
Size
Size
120 HP 1985-87
4
STD Port 3.500
1800P 1800PV
1800PH 3118PS
90
o
Looper
STD Star 3.500
1800S 1800SV
1800SH 3118SS
(Small Bore)
.020 Port 3.520
1820P 1820PV
1820PH 3118P2
.020 Star 3.520
1820S 1820SV
1820SH 3118S2
.030 Port 3.530
1830P 1830PV
1830PH 3118P3
.030 Star 3.530
1830S 1830SV
1830SH 3118S3
.044 Port 3.544
-
-
3118P4
.044 Star 3.544
-
-
3118S4
.064 Port 3.564
-
-
3118P6
.064 Star 3.564
-
-
3118S6
120 HP 1988-94
4
STD Port 3.685
1900P 1900PV
1900PH 3119PS
90
o
Looper (Big Bore)
STD Star 3.685
1900S 1900SV
1900SH 3119SS
125 HP 1988-93
.020 Port 3.705
-
1920PV
1920PH 3119P2
90
o
Looper (Big Bore)
.020 Star 3.705
-
1920SV
1920SH 3119S2
125 HP 1989-91
.030 Port 3.715
1930P 1930PV
1930PH 3119P3
90
o
Looper (Big Bore)
.030 Star 3.715
1930S 1930SV
1930SH 3119S3
Commercial
.040 Port 3.725
-
3119P4
130 HP 1995-2004
.040 Star 3.725
-
-
3119S4
135 HP 1974-76
4
STD
3.500
1300
1300V
1300PH 3173PS
140 HP 1977-84
.020
3.520
1320
1320V
1320PH 3173P2
(Crossflow)
.030
3.530
1330
1330V
1330PH 3173P3
.800" from bottom
.040
3.540
1340
1340V
1340PH
-
of WP to bottom
.044
3.544
-
-
3173P4
of piston
.064
3.564
-
-
3173P6
115 HP 1973
4
STD.
3.500
-
-
3174PS
135 HP 1973
4
.020
3.520
-
-
3174P2
(Crossflow)
.030
3.530
-
-
3174P3
.660" bottom of w/p
.044
3.544
-
-
3174P4
to bottom of piston
.064
3.564
-
-
3174P6
140 HP 1985-87
4
STD Port 3.500
1800P 1800PV
1800PH 3118PS
90
o
Looper
STD Star 3.500
1800S 1800SV
1800SH 3118SS
(Small Bore)
.020 Port 3.520
1820P 1820PV
1820PH 3118P2
.020 Star 3.520
1820S 1820SV
1820SH 3118S2
.030 Port 3.530
1830P 1830PV
1830PH 3118P3
.030 Star 3.530
1830S 1830SV
1830SH 3118S3
.044 Port 3.544
-
-
3118P4
.044 Star 3.544
-
-
3118S4
.064 Port 3.564
-
-
3118P6
.064 Star 3.564
-
-
3118S6
140 HP 1988-94
4
STD Port 3.685
1900P 1900PV
1900PH 3119PS
90
o
Looper
STD Star 3.685
1900S 1900SV
1900SH 3119SS
(Big Bore)
.020 Port 3.705
-
1920PV
1920PH 3119P2
.020 Star 3.705
-
1920SV
1920SH 3119S2
.030 Port 3.715
1930P 1930PV
1930PH 3119P3
.030 Star 3.715
1930S 1930SV
1930SH 3119S3
.040 Port 3.725
-
3119P4
.040 Star 3.725
-
-
3119S4
150 HP 1978-91
6
STD
3.500
1300
1300V
1300PH 3173PS
Crossflow
.020
3.520
1320
1320V
1320PH 3173P2
.030
3.530
1330
1330V
1330PH 3173P3
.040
3.540
1340
1340V
1340PH
-
.044
3.544
-
3173P4
.064
3.564
-
-
3173P6
OMC PISTONS
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