Ryobi 1090R User Manual
Reissued 12/99
ENGINE PARTS - MODEL 1090r
4-CYCLE GAS TRIMMER
(Serial Number 810000001 and greater)
97
3
2
1
98
4
5
9
8
9
8
32
7
6
31
36
38
37
12
11
10
50
52
13
14
35
34
33
15
44
43
42
40
100
103
104
51b
51a
101
102
39
16
19
17
49
48
46
45
47
18
25
24
56
55
53
53
21
22
21
29
54
30
28
27
26
41
79
78
87
83
82
80
76
89
88
91
90
84
92
74
93
85
86
94
73
95
96
67
69
70
72
65
66
63
62
60
59
58
99
57
61
71
77
81
64
Version B has a
raised oil can
on crankcase
68b
75a
20a
20b
23a
23b
75b
68a
Part Numbers On Following Page
ENGINE PARTS - MODEL 1090r
4-CYCLE GAS TRIMMER
(Serial Number 810000001 and greater)
Reissued 12/99
Item Part No. Description
1 181025 Valve Cover Screw
2 182098 Valve Cover
3 182099 Valve Cover Gasket
4 181030 Rocker Adjustment Nut
5 182101 Rocker Arm Pivot
6 182100 Rocker Arm
7 181033 Push Rod
8 181034 Hex Nut
9 181035 Washer
10 182102 Push Rod Guide
11 182103 Valve Spring Retainer
12 181038 Valve Spring
13 182306 Cylinder Head with Valve Seal
(includes 10-14)
14 181040 Valve
15 181000 O-Ring
16 181001 Cylinder Head Gasket
17 182132 Cylinder
18 181003 Screw (M5 x 18.7mm)
19 181004 Cylinder Gasket
20a 181005 Piston Ring Set (1 Piece Oil Ring)
20b 182295 Piston Ring Set (3 Piece Oil Ring)
21 181008 Wrist Pin Button
22 181006 Wrist Pin
23 181007 Piston (1 Piece Oil Ring)
23 182300 Piston (3 Piece Oil Ring)
24 181010 Cylinder Stud (83.5mm)
25 181011 Cylinder Stud (115.5mm)
26 181012 Cam Bracket Screw
27 181013 Cam Bracket
28 182123 Cam Follower (Chromed)
29 182124 Cam Gear
30 182125 Cam Bracket Assembly (includes 26-29)
31 180852 Spark Plug
32 182105 Muffler Mounting Screw
33 182106 Muffler
34 181020 Screw
35 182107 Muffler Gasket
36 182108 Module
37 181066 Screw
38 611063 Ground Tab
39 182131 Insulator Gasket
40 182109 Insulator
41 181709 Carburetor Gasket
42 182110 Carburetor
43 181751 O-Ring, Carburetor
44 182096 Breather Hose
45 182111 Air Cleaner Assembly
46 182097 Breather assembly
47 182133 Screw
48 182116 Air Filter
49 182115 Air Cleaner Cover
50 182105 Screw
51a 182112 Throttle Cable Bracket (version A)
51b 182589 Throttle Cable Bracket (version B)
52 181054 Primer and Line Assembly
53 182113 Flywheel
54 181731 Spacer (version B flywheel mounting)
55 182590 Clutch Washer
56 181730 Clutch
57 180232 Clutch Drum
Item Part No. Description
58 182114 Front Housing
59 181764 Screw
60 181761 Nut
61 181760 Engine Bolt
62 181003 Screw
63 182188 Anti-Rotation Screw
64 182127 Oil Seal
65 182128 Snap Ring
66 182134 Bearing
67 182135 90° Elbow
68a 182140 Crankcase (version A) (includes 73)
68b 182593 Crankcase (version B) (includes 73)
69 182136 Crankcase Gasket
70 182139 Crankshaft
71 182126 Lead Wire
72 182138 Bearing
73 182147 Screw
74 181021 O-Ring
75a 181022 Oil Cap Dipstick (version A crankcase)
(includes 74)
75b 182289 Oil Cap Dipstick (version B crankcase)
(includes 74)
76 182142 Oil Seal
77 182187 Pulley with Nut
78 181747 Retaining Ring
79 181746 Spring
80 181745 Ratchet
81 182118 Pulley Assembly (includes 77-88)
82 181740 Screw
83 181741 Washer
84 181738 Recoil Pully
85 181742 Rope
86 181079 Pull Handle
87 181739 Recoil Spring
88 182120 Recoil Case
89 182121 Square Nut
90 182122 Rope Guide
91 182143 Screw
92 182117 Recoil Case Assembly
(includes 82-91)
93 181083 Fuel Cap
94 182130 Fuel Tank
95 182144 Screw with Washer
96 182129 Fuel Line Assembly
97 182145 Engine Cover
98 182146 Screw
99 182157 Wire Grommet
100 182159 Nut
101 182293 Spark Plug Cover
102 612468 Spring
103 182261 Nut (version A flywheel mounting)
104 182591 Lock Washer (version A flywheel mounting)
* 182595 Crankcase Assembly
(includes 24, 25 & 64-76)
* 182594 Short Block Assembly
(includes 1-30, & 64-76)
* 182307 Valve Stem Seal
* 182153 Spark Arrestor Screen
* 182156 AC-10 Carburetor Repair Kit
* Parts not shown
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