There are 5 different bottom ends:
M1 early case reed valve, 1-speed auto, pedals, silver
M1 xxxx case reed valve, 1-speed auto, pedals, black
M1.K xx case reed valve, 1-speed auto, kick-start
M101 xx case reed, variator transmission, pedals
M101.K case reed, variator transmission, kick-start
There are 2 different top ends (cylinder, piston and head):
iron cylinder all cast iron 40.4 mm, piston 12 x 19
aluminum cyl. iron sleeve 40.4 mm, piston 12 x 16
M1 and M101
1. M1 ’79-88+
2. M101 ’81-89?
04# 5# qty
01# 2# 12 Morini# price description
n/s 000 10 26-0505 $25.0 seal set M1 2-57, 2-105, 1-92
000 n/s 01 26-0514 $30.0 seal set M101 2-33, 2-109, 1-91, 1-74
001 000 10 26-5086 none semi case, right for M1
000 001 01 26-5095 none semi case, right for M101
002 000 10 26-5087 none semi case, left for ∅80 2-bolt stator
000 002 01 26-5096 none semi case, left for ∅80 2-bolt stator
003 000 10 16-4104 none gasket, case center
000 003 01 16-4108 none gasket, case center
004 000 10 12-4084 none cover, clutch w/cable stop
000 004 01 12-4088 none cover, clutch (variator)
005 000 10 16-4105 $12.0 gasket, clutch cover
000 005 01 12-4089 none cover, magneto (flywheel)
006 000 10 12-4083 none cover, magneto (flywheel)
007 000 10 12-2061 $200-$170 cyl. & piston alu-reed 40.4
000 006 01 12-2062 none cylinder & piston iron-reed 40.4
008 007 11 16-4030 $9.00 gasket, cylinder base Ø6 46×46
009 000 10 27-5019 $39.0 cylinder head 46 x 46
000 008 01 27-5027 none cylinder head 46 x 46 with decomp
000 009 01 16-4111 none head gasket Ø6 46 x 46 (use 16-4032)
010 000 10 16-4032 $9.00 head gasket Ø6 46×46
011 000 10 29-1986 $0.80 bolt M6 x 25 allen blk R cover up-rr
012 012 10 29-1988 $0.60 bolt M6 x 35 allen blk R cover lo-rr
012 012 10 29-1988 $0.60 bolt M6 x 35 allen blk case up-rr
013 000 20 29-1987 $1.00 bolt M6 x 30 allen blk case fr-lo
014 000 60 29-1990 $1.20 bolt M6 x 45 allen blk case
014 000 40 29-1990 $1.20 bolt M6 x 45 allen blk R cover
015 000 20 29-1991 $1.40 bolt M6 x 50 allen blk L cover
000 010 01 29-1987 $1.00 bolt M6 x 30 allen blk L cover lo
000 011 01 29-1990 $1.20 bolt M6 x 45 allen blk L cover up
000 011 03 29-1990 $1.20 bolt M6 x 45 allen blk R cover
012 012 09 29-1988 $0.60 bolt M6 x 35 allen blk case
016 013 44 23-5001 $4.00 cyl. stud M6 x 108 class 8.8 to hold 8 ft-lbs
016 013 44 23-50A $3.50 cylinder stud M6 x 110 class 8.8
017 015 44 13-1001 $0.60 head nut M6 – 1.00 x 6 hex10
018 014 44 25-4001 $0.20 head washer M6
019 016 22 23-5014 $2.50 exhaust stud M5 x 30
020 018 22 13-3023 $1.50 nut, tall exhaust M5 – 0.80 x 25 hex8
021 017 22 25-4013 $0.25 exhaust lock washer Ø5 Ø8 x 1.5
022 019 22 23-5021 $3.00 intake stud M6 x 30
026 021 11 12-0108 none carb SHA14/12 #52 fits 18 intake
026 021 11 12-01B $70.0 carb SHA14/12 #52 fits 18mm intake
027 022 11 15-0030 none air filter cover 37a for M1, M101
028 022 11 25-1050 $35.0 intake, right type Ø14 x Ø18
029 023 11 25-1051 $32.0 intake, front type Ø14 x Ø18
029 023 11 25-1055 none intake, front type Ø9 x Ø18 (1.0 hp)
036 031 11 16-1005 $9.00 needle bearing Ø12 Ø15 x 15
037 032 22 12-6001 $16.0 ball bearing, crankshaft 6203C3
038 033 22 10-6001 $7.50 seal, crank shaft 17 x 35 x 8 (or 7)
039 034 11 13-3007 $10.0 nut, flywheel M8-1.25 × 16 hex15
040 035 11 12-7025 $4.50 woodruff key, flywheel 2.5 x 3 x 9 M83
000 036 01 25-4075 none washer, plain Ø8 Ø24 x1.0? for M101 variator
000 037 01 13-3027 none nut, clutch front M8-1.25 x 7 hex24 = Vespa
000 038 01 12-7144 none drive belt AX15 for M101 see VBeltSupply.com
000 039 01 13-6047 none spacer, variable speed for M101
000 040 01 26-8073 none inner variator pulley half =Vespa?
000 041 01 13-6044 none sleeve, variable speed for M101
000 042 01 12-0106 none variator housing-drum for M101
000 043 01 12-7140 none variator roller housing, inner =Vespa?
000 044 010 26-8072none roller cap =Vespa?
000 045 010 25-4077none roller washer Ø?? Ø?? x ???
000 046 05 25-7035 none roller (bare) =Vespa?
000 047 01 13-5035 none disc, variable drive =Vespa?
041 000 10 13-1003 $2.50 nut, clutch M10-1.25 x 6 hex17
042 000 10 25-4018 $5.00 washer, plain Ø10 Ø21 x 1.8 clutch
042 000 10 25-401S $2.00 substitute Ø10 Ø22 x 1.6
043 000 10 25-4005 none washer, shim Ø15 Ø22 x 0.6 behind drum
044 048 11 23-0134 none piston for al-reed 12-16-17-40.4 std.
044 048 00 23-0135 none piston for al-reed 12-16-17-40.6 1-over
044 048 00 23-0135 none piston for al-reed 12-16-17-40.8 2-over
044 048 11 23-0136 none piston for ir-reed 12-19-17-40.4 std.
044 048 11 23-0136 $63.0 piston for ir-reed 12-19-17-40.4 GOL 0307
044 048 00 23-0137 none piston for ir-reed 12-19-17-40.6 1-over
044 048 00 23-0137 none piston for ir-reed 12-19-17-40.8 2-over
045 049 22 26-1045 $9.00 piston ring 40.4 x 1.5 GI standard
045 049 00 26-1046 $12.0 piston ring 40.6 x 1.5 GI oversize
045 049 00 26-1046 $12.0 piston ring 40.8 x 1.5 GI oversize
046 050 11 26-8001 $10.0 pin, piston Ø12 x 31.5
047 051 22 10-4001 $1.00 clip, wrist pin for Ø12 hole
048 054 11 27-3007 $10.0 oil filler/check plug M14-1.25
049 055 11 16-4026 $4.00 gasket, oil filler plug ring Ø14 x 19
050 000 10 29-1182 $1.50 oil drain plug M8 x 10 slot
000 052 01 29-4132 $0.80 oil drain plug M8 x 10 hex
051 053 11 16-4008 $1.00 drain plug gasket Ø8 x 14
000 056 01 10-1091 none shaft, prim. with gear
000 057 01 10-1098 none shaft, main
000 058 01 18-1143 none main gear
000 059 01 18-4024 none sliding clutch, engage
000 060 01 12-6003 $7.00 ball bearing, prim. shaft #6201 12x32x10
053 000 10 11-5010 none bushing plain, clutch drum Ø15 Ø18 x 18.5
054 000 10 25-4005 none washer, shim Ø15 Ø22 x 0.6 clutch drum
055 000 10 20-0012 $55.0 clutch assembly
056 000 10 20-0003 none housing, clutch
057 000 10 12-7020 $33.0 clutch shoe (ea) tire tread surface
058 000 10 12-7021 $9.50 clutch shoe master link #520
059 000 10 20-1033 $5.00 spring, extension, clutch
060 000 10 25-7002 $3.00 spring anchor pin Ø3 x 14 substitute
063 000 10 20-1019 $15.0 spring, compression Ø27 Ø19 x 21 starter
064 000 10 12-7022 $35.0 clutch starting plate 20.8 deep
065 000 10 10-4006 $8.00 clip, clutch plate for Ø84 hole
066 000 10 19-0004 $15.0 lever, start rear-pull Ø12
066 000 10 21-0004 none start lever/shaft regular (front-pull)
067 000 10 10-7002 $2.00 o-ring, starting lever Ø2 x 9 id (13 od)
068 000 10 20-1018 $8.00 spring, torsion, starter lever
068 000 10 20-1022 none spring, torsion, starter lever (use 20-1018)
069 000 10 26-8014 none pin, clutch lever for MO, MO1, M1
073 000 10 25-4005 none washer, shim Ø15 Ø22 x 0.6 prim. shaft
074 000 10 25-4040 none washer, shim Ø13 Ø18 x 0.2
075 093 11 11-5003 none bushing with lip, drive shaft Ø13 Ø?? x ??
076 061 22 12-6002 $10.0 ball bearing, drive shaft #6202 15 x 35 x 11
077 000 10 13-1003 $2.50 nut, primary shaft
078 000 10 25-4018 none washer, plain Ø3 Ø6? x1.0? for??
079 000 10 10-6008
080 000 10 23-2534 none sprocket 13T flat-sided thick
000 062 01 12-7002
000 063 01 13-3026
000 064 01 25-4076
000 065 01 26-8071
000 066 01 26-8070
000 067 01 20-1075
000 068 01 10-5028
000 069 01 13-5037
000 070 01 20-1076
000 071 01 20-6030
000 072 01 20-1083
000 073 01 23-7053
000 074 01 10-6021 $5.50 seal, variator 13 x 19 x 3
000 075 01 16-1019
000 076 01 13-5034
000 077 01 25-4073
000 078 01 25-4074
000 079 01 10-5023
000 080 01 10-6020
000 081 01 10-5024
000 082 01 20-1077
000 083 01 20-6029
000 084 01 20-1082
000 085 01 12-7141
000 086 01 25-4023
000 087 01 13-1006
081 088 11 13-1002 $10.0 nut, sprocket M12-1.25 x 6 hex17
083 000 10 10-1020 none shaft, pedal
000 089 01 25-4002
000 090 01 23-2550 $15.0 sprocket 10T flat-sided thick
000 091 01 10-6008 $6.00 seal, drive shaft 15 x 24 x 7 (or 5)
000 092 01 2
000 094 01 2
000 095 01 2
000 096 01 2
000 097 01 2
000 098 01 2
000 099 01 2
000 100 01 2
000 101 01 2
000 102 01 2
000 103 01 2
000 104 01 10-1093 none shaft, pedal
084 000 10 23-2543 none pedal sprocket 17T
000 105 01 23-2547 none pedal sprocket ??T
085 106 11 20-6001 none coupling claw (collar)
086 107 11 20-1015 none spring, coupling claw, pedal
087 000 10 12-7016 $12.0 pedal chain #35 x 24 link Regina ASA35
000 108 01 12-7142 none pedal chain
088 109 22 10-6004 $7.50 seal, pedal shaft 16 x 24 x 5
089 110 11 25-4007 none washer, plain Ø16 Ø26?x1.5?
090 111 11 10-5005 $1.50 snap ring, outer for Ø16 shaft
091 n/s 11 23-7002Dnone pedal arm D right 4¾x1¼” 434R use 502R
091 n/s 00 23-700R none pedal arm D right 5 x1½” 502R
091 n/s 11 23-7002Snone pedal arm S left 4¾x1¼” 434L use 502L
091 n/s 00 23-700L $20.0 pedal arm S left 5 x1½” 502L
092 n/s 22 12-7017 $2.00 pedal wedge pin Ø9.0 H-134
093 000 10 29-0045 $330. magneto Dansi 101765 ign gnd ext
093 113 11 29-0045Bnone magneto Bosch 0212-010-003 ext
093 113 11 29-0053 none magneto CEV 6420 ign gnd ext
094 114 22 29-6022 $0.70 bolt M4 x 12 phil wide for stator
095 115 22 25-4070 $0.50 washer, star Ø4 Ø8 for stator
096 116 11 16-3022 none grommet, magneto ext spark 3-thin holes
097 117 11 11-8007 none spark coil Bosch H79A
097 117 10 11-H79B none spark coil Dansi H79B
098 000 10 12-7026 $4.50 spark plug NGK BR5ES
000 118 01 12-7075 $4.00 spark plug NGK B6ES = W7D
099 119 11 23-7001 $6.00 spark plug cap generic
100 120 11 16-3004 none rubber boot, spark plug cap
M1.K
6. M1.K ’79-90+
# qty Morini# price
n/s 1 26-0505 $25.0 seal set M1.K 2-57, 2-105, 1-92
01 1 26.5086 none semi case, right for M1
02 1 26.5087 none semi case, left for M1
03 1 16.4104 none gasket, case center M1
04 1 12.4085 none clutch cover for kickstart
05 1 16.4105 $12.0 gasket, clutch cover
06 1 12.4083 none cover, magneto (flywheel)
07 1 12.2061 $200-$170 cyl. & piston alu-reed 40.4
08 1 16.4030 $9.00 gasket, cylinder base Ø6 46×46
09 1 27.5019 $39.0 cylinder head 46 x 46
10 1 16.4032 $9.00 head gasket Ø6 46×46
11 2 29.1987 $1.00 bolt M6 x 30 allen blk case
12 1 29.1989 $1.20 bolt M6 x 40 allen blk case
13 6 29.1990 $1.20 bolt M6 x 45 allen blk case
13 4 29.1990 $1.20 bolt M6 x 45 allen blk R cover
14 2 29.1991 $1.40 bolt M6 x 50 allen blk L cover
15 2 29.1992 $0.80 bolt M6 x 55 allen blk R cover
16 4 23.5001 $4.00 cyl. stud M6 x 108 class 8.8 to hold 8 ft-lbs
16 4 23-50A $3.50 cylinder stud M6 x 110 class 8.8
17 4 13.1001 $0.60 head nut M6 – 1.00 x 6 hex10
18 4 25.4001 $0.20 head washer M6
19 1 23.5014
20 1 13.3023
21 1 25.4013
22 1 23.5009
23 1 13.1001
24 1 25.4001
25 1 16.4093
26 1 12.0108 none carb SHA14/12 #52 fits 18 intake
26 1 12-01B $70.0 carb SHA14/12 #52 fits 18mm intake
27 1 15-0030 $11.0 air cover #37a no inlet tubes
27 2 15-0030 $8.00 air cover inlet tube Ø9 Ø12 x 50
28 1 25-1050 $35.0 intake, right type Ø14 x Ø18
29 1 25-1051 $32.0 intake, front type Ø14 x Ø18
30 1 16.4103
31 1 29.0501
32 1 16.4106
33 1 16.7005
34 1 10.0015
35 1 11.0015
36 1 16.1005 $9.00 needle bearing Ø12 Ø15 x 15
37 2 12.6001 $16.0 ball bearing, crankshaft 6203C3
38 2 10.6001 $7.50 seal, crank shaft 17 x 35 x 8 (or 7)
39 1 13.3007 $10.0 nut, flywheel M8-1.25 × 16 hex15
40 1 12.7025 $4.50 woodruff key, flywheel 2.5 x 3 x 9 M83
41 1 13.1003 $2.50 nut, clutch M10-1.25 x 6 hex17
42 1 25.4018 $5.00 washer, plain Ø10 Ø21 x 1.8 clutch
43 1 25.4005 none washer, shim Ø15 Ø22 x 0.6 clutch drum
44 1 23.0125 $70.0 piston for alu. cyl 12-16-17-40.4 std.
44 0 23.0126 $72.0 piston for alu. cyl 12-16-17-40.6 1-over
45 1 26.1045 $9.00 piston ring 40.4 x 1.5 GI std.
45 0 26.1046 $12.0 piston ring 40.6 x 1.5 GI 1-over
46 1 26.8001 $10.0 pin, piston Ø12 x 31.5
47 2 10.4001 $1.00 clip, wrist pin for Ø12 hole
48 1 27.3007 $10.0 oil check plug
49 1 16.4026 $4.00 plug gasket
50 1 29.1182 drain plug
51 1 16.4008 drain plug gasket
52 1 27.0040 drum and gear set
53 1 11.5010 bushing, clutch
54 2 25.4005 washer, clutch
55 1 20.0012 clutch assy
56 1 20.0003 clutch housing
57 2 12.7020 $33.0 clutch shoe
58 2 12.7021 $9.50
59 4 20.1033 $5.00 clutch spring
60 1 25.7002 $3.00 spring anchor pin Ø3 x 14 substitute
61 1 13.5031
62 1 10.5009
63 1 10.0038
64 1 18.4022
65 1 18.1099
66 1 20.1070
67 1 25.4007
68 1 10.7003
69 1 25.4054
70 1 10.5005 $1.50 snap ring, outer for Ø16 shaft
71 1 10.1087
72 1 10.1088
73 1 25.4005
74 1 25.4040 none washer, shim Ø13 Ø18 x 0.2
75 1 11.5003
76 1 12.6002
77 1 13.1003
78 1 25.4018 $5.00 washer, plain Ø10 Ø21 x 1.8 clutch
78 1025-401S $2.00 substitute Ø10 Ø22 x 1.6
79 1 10.6008
81 1 13.1002 $10.0 nut, sprocket M12-1.25 x 6 hex17
82 1 25.4002
83 1 23.2534 none sprocket 13T flat-sided thick
84 1 19.1031
85 1 20.1059
86 1 25.4023
87 1 23.1039
88 1 16.3015
89 1 10.5020
93 1 29.0034 none magneto Dansi 101286 ign gnd int
94 2 29.6022 $0.70 bolt M4 x 12 phil wide for stator
95 1 25.4070 $0.50 washer, star Ø4 Ø8 for stator
96 1 16.3022 none grommet for ext. spark, 3-thin holes
97 1 11.8007 none spark coil Dansi
98 1 12.7076 $3.50 spark plug NGK BP6ES
99 1 23.7001 $6.00 spark plug cap generic
1001 16.3004 none rubber boot, spark plug cap
1011 23.7029 none rubber disc-plug for pedal shaft hole
M1: In 1979 Morini came out with the M1 engine, a one-speed with a case-type reed valve. The reed valve induction produced about 20-30% more torque. The result was acceleration about the same as a MO-2 two-speed, but at a much lower cost and complexity. So by about 1980, both the MO-1 and MO-2 were discontinued in favor of the M1.
M101: In 1981 the two-speed M101 came out, a variator-transmission belt-drive engine with a M1 top-end (cylinder, piston and head). The variable-ratio-pulley transmission resulted in increased acceleration over the fixed-ratio M1. The price increased and so did the weight and case length.