4900 Molly Pitcher Highway
Chambersburg, PA 17202 US
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Troy-Bilt 678-SU 278cc Engine General Assembly 678-Su

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Diagrams Shown are for U.S. Models

General Assembly 678-Su

Prices shown are USD

Ref#
 Part
Price
Qty
 
1
Bolt, M6?16
$4.25
2
Valve Cover
$22.46
3
Breather Hose
$5.75
4
Clamp
$3.01
5
Breather Hose
$5.80
6
Gasket, Valve Cover
$11.04
7
Rocker Arm Assembly
$8.96
8
Lock Nut
$6.18
9
Adjust Nut
$6.85
10
Rocker Arm
$5.87
11
Stud
$4.68
12
Rocker Arm Base
$5.21
13
Valve Adjust Cap, Exhaust
$4.39
14
Valve Spring Seat
$2.90
15
Valve Spring
$2.81
16
Valve Spring Seat
$2.81
17
Intake Valve Seal
$7.67
18
Screw M4 X 55
$4.55
19
Bolt, M6?12
$3.01
20
Shroud
$18.05
21
Muffler Guard
$41.62
22
Bolt, M6?10
$2.93
23
Exhaust Pipe Guard
$19.61
24
Snow Guard
$20.32
25
Bolt, M6?16
$4.55
26
Primer
$11.50
27
Primer Base
28
Primer Cup
$7.50
29
Throttle Lever Knob
$5.44
30
Stop Switch
$8.35
31
Stop Switch Base
$10.04
32
Stop Switch Key
$4.79
33
Choke Lever
$4.68
34
Muffler assembly
$76.64
35
Bolt
$4.42
36
Muffler Guard
$16.94
37
Muffler Body
$51.53
38
Gasket, Muffler
$4.43
39
Exhaust Pipe
40
Gasket
$4.19
41
Nut, M8
$4.19
42
Nut, M8
$2.87
43
Gasket, Muffler
$3.85
44
Stud, M8?48.5
$4.31
45
Spark Plug
$7.65
46
Cylinder Head
$127.18
47
Stud, M6-8?104
$4.79
48
Gasket, Carburetor Insulator
$3.30
49
Insulator
$5.82
50
Gasket, Carburetor
$3.71
51
Carburetor
$83.56
52
Fuel Hose, 3.2?6.5?240
$5.80
53
Gasket, Carburetor
$5.80
54
Heater Box
$17.30
55
Choke Controller Assembly
$6.13
56
Nut, M6
$4.56
57
Gasket, Cylinder Head
$8.75
58
Pin, 12?20
$4.20
59
Push Rod
$9.04
60
Intake Valve
$13.31
61
Exhaust Valve
$14.65
62
Tappet
$5.72
63
Piston Ring Set
$16.31
64
Piston Ring, 1st
65
Piston Ring, 2nd
66
Scraper Ring, Oil Ring
67
Lining Ring, Oil Ring
68
Circlip
$2.83
69
Piston
$22.92
70
Piston Pin
$5.29
71
Connecting Rod Assembly
$45.30
72
Connecting Rod
73
Connecting Rod Cap
74
Connecting Rod Bolt
$3.30
75
Bolt, M6?8
$2.81
76
Clamp
$5.35
77
Dipstick
$18.62
78
Dipstick
$8.96
79
O-Ring, 21?2.77
$4.57
80
Dipstick Seat
$9.74
81
O-Ring, 15.2?1.5
$3.52
82
Oil Seal, 30?46?8
$10.42
83
Bolt, M8?45
$3.05
84
Bolt, M8?38
$4.48
85
Crankcase Cover
$76.78
86
Gasket, Crankcase
$10.73
87
Washer, 16?0.5?24
$2.81
88
Pin, 9?12
$4.18
89
Bearing, 6206
$25.79
90
Camshaft
$56.93
91
Crankshaft
$145.23
92
Woodruff Key
$4.28
93
Oil Plug
$4.36
94
Oil Plug
95
O-Ring, Dipstick
$2.78
96
Pin, 7?14
$2.89
97
Governor Gear
$13.32
98
Governor Cup
$3.47
99
Retaining Ring
$3.47
100
Governor Shaft
101
Governor Gear
102
Washer, 6.5?1?13
$3.47
103
Bolt, M8?20
$4.42
104
Bush
$2.78
105
Clamp
$2.83
106
Fuel Hose, 6.3?12.5?270
$5.80
107
Decorative Cover
$16.15
108
Bolt, M8?14
$3.74
109
Fuel Tank Base
$27.01
110
Governor Gear Bracket Assembly
$28.35
111
Governor Lever
$15.43
112
Bolt
$4.45
113
Nut, M6
$4.56
114
Governor Lever
115
Screw, M4?55
$4.55
116
Electric Starter
$235.07
117
Bolt, M8?55
$4.73
118
Fuel Cap
$15.04
119
Bush
$2.89
120
Fuel Tank
$84.99
121
Fuel Nipple
$10.75
122
Damping Pad
$4.30
123
Damping Pad
$4.46
124
Fuel Tank
125
Fuel Tank Base
$30.46
126
Decorative Cover
$16.10
127
Cotter Pin
$4.18
128
Washer, 8?0.8?20
$4.20
129
Oil Seal, 8?14?4
$2.87
130
Governor Gear Shaft
$4.78
131
Governor Spring
$3.01
132
Idle Spring
$5.45
133
Throttle Linkage
$2.76
134
Oil Seal, 30?46?8
$4.63
135
Ignition Module
$50.38
137
Wire Board
$3.77
138
Bolt, M6?8
$4.18
139
Crankcase
$230.05
140
Oil Drain Pipe
$6.13
141
Washer, 10?1.5?16
$4.73
142
Earth Bolt
$4.70
143
Bolt, M6?28
$2.78
144
Charging Coil
$56.14
145
Bolt, M6?30
$2.89
146
Flywheel
$73.94
147
Cooling Fan
$35.34
148
Starter Cup
$11.49
149
Nut, M16?1.5
$5.75
150
Recoil Starter
151
Blower Housing
$53.20
152
Recoil Starter
$59.99
153
154
Recoil Spring
$7.87
155
Starter Handle
$8.57
156
Alignment Bolt
157
Guide Plate
158
Starter Pawl
159
Return Spring
160
Starter Reel
161
Starter Rope
162
Starter Cover
163
Washer, 6
$4.68
164
Bolt, M6?10
$4.52
165
Stop Switch Key
$4.79
166
Control Panel
$33.33
a
Choke Shaft
b
Washer, 3
$2.81
c
Screw, M3?6
d
Choke Plate
e
Throttle Shaft
f
Throttle Plate
g
h
Throttle Shaft Sleeve
i
Idle Jet Rivet
j
Idle Jet
k
Idle Adjusting Screw
l
Venting Hose
m
Primer Line
n
Carburetor Body
o
Float Pin
p
Nozzle Tube
q
Needle Valve
r
Main Jet
s
Needle Valve Spring
t
u
O-Ring, Float Bowl
$4.78
v
Float Bowl
w
O-Ring, Float Bowl
$4.60
x
Bolt
$2.89
y
Gasket, Drain Bolt
$2.94
z
Drain Bolt
$2.89