Myrons Mopeds

Benelli models with G2, G2K engines 1970-80

49 cc horizontal cylinder 1-speed, automatic clutch.

 

 

G2 engine: (Gentlemen Due 49cc) is on US models 1977-80 Benelli G2, 1976-77 Benelli Blazer, 1978-80 Moto Guzzi, and 1977-80 Moto Guzzi Robin and UK models 1974-80? G2. The G2 engine is the second generation of the late 60’s GM engine, a 25mph horizontal cylinder one-speed automatic, with a Dellorto 9mm sipping straw. Like the GM, the G2 engine does not have built-in pedals. The external pedal system is unusual with both pedal and motor chains on the left side. Most bicycle chains are on the right side, so a special reverse or “left hand” freewheel is required.

 

G2 engine type G (long exhaust, Adler clutch)

 

 

 

 

 

 

 

 

 

G2 engine type R (short exhaust, Rimoldi clutch)                  G2 engine type R (short exhaust, Rimoldi clutch)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

G2K engine: (Gentlemen Due Kick 49cc) is on 1970-76 Gentleman, UK models 1974-80? Motorella, 1978-80? G2 KS and G2 Elle. Eliminating the pedals and pedal chain simplified the frame design, and allowed the rear wheel to have a single sprocket and bigger wheel bearings (since they did not have to pass through the inside of a freewheel). 

Here is a English language 1978 Benelli Service Manual (UK models 50-125cc) a PDF download for the mopeds below and others. Euro models have a Dansi 101662 magneto. Euro models with brake light have Dansi 101813. US models (all with brake light) have Dansi 101441 or 101813.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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Benelli G2 Parts

Benelli G2-USA specs:  40mm piston with same vertical dimensions as Morini, 8.5 comp. ratio, 25mph, 1.5hp at 4400rpm, 150mpg. sprockets 12 x 46T, trans oil 4 oz of 10w40 motor oil, fill plug on lower right is also oil level check plug, cables are all single-ended, seat post 25.0 x 22mm

Benelli G2-USA components: 2.25-16″ tires, 1.35-16″ rims, Benelli one speed automatic engine, Dellorto SHA 14/9 carburetor, #44 jet. Dansi 101813 magneto (external ignition ground type). CEV 2139 bullet head light, CEV 9400.2 tail light (with resistor for external ignition ground magneto), CEV plastic slide clamp-on switches, PV controls, Grimeca hubs (rear hub is special, has both chains on left side, Benelli only) and brakes, 11mm axles, Veglia speedometer with LH driver, 12×1 female gas valve with special long detachable handle-shaft that goes through a hole in the side panel.

The Benelli Blazer is made by Motobi. It is like a G2 but with a standard tube frame with separate gas tank. The European version is called Benelli Bobo.

Here three parts catalogs G, R and B are combined into one list.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

.G#  R#  B#  00 1975# 0000  1980# 0   price 0 1970# 0 description        specs
001 000 000 000.000.0.000 71.80.15.25  N/A     ‌G00  start cable gray 2P 2 ends ∅7 φ6 52 x ?
000 000 000 000.000.0.000 00.00.00.00  $10.0 ‌‌G0  substitute gray 1P 1 ended ∅7  52 x 57″
000 000 001 239.127.0.799 00.00.00.00  $10.0 ‌FA3706/8 s cable blk 1L 1 ended φ6  52 x 57″
000 C44 000 000.000.0.000 48.80.15.70  $10.0 ‌‌G0   start cable black 1P 1 ended ∅7  52 x 57″
002 C43 002 225.005.0.815 48.80.18.70  $0.50 ‌G7191 start cable stop cap  for 1P F5C photo 
003 C42 003 326.044.0.799 48.80.25.70  $4.00 ‌G10 start cable spring subst. 6.5-7.0 id x 60-75
004 C40 004 438.001.0.817 48.09.39.70  N/A     G7947/C start lever-shaft ∅11
005 C39 005 901.032.0.200 90.70.61.07  $$.$$ ‌G4 start shaft seal ring
006 C38 006 314.012.0.832 48.08.76.70  none. ‌G7948 start lever inner
007 C37 007 904.009.0.100 90.27.10.11  $2.00 ‌G7949 start shaft circlip 11 x 1.0
008 A15 008 247.038.0.826 48.00.16.70  N/A     N8 clutch cover
009 A16 009 982.048.0.126 98.62.03.30  $1.00 ‌MU1224 cover screw M6x30 allen black
010 A17 010 982.051.0.126 98.62.03.45  $1.20 ‌MU3732 cover screw M6x45 allen black
011 000 011 328.127.0.799 48.01.55.81  N/A     G 000 Benelli emblem
000 A18 000 000.000.0.000 71.01.55.00  N/A     G 000 Moto Guzzi emblem
013 A20 013 917.043.0.125 98.05.23.30  $1.00 ‌H8103 cover and ex. bolt M6 x 30 hex

014 000 014 970.021.0.149 95.02.11.06  $0.25 ‌G 000 toothed washer ∅6
015 A21 015 221.010.0.799 39.01.88.00  $$.$$ ‌UI189 oil filler and check plug
016 A22 016 383.010.0.799 90.71.41.26  $$.$$ ‌L418 check plug gasket
017 A23 017 916.074.0.125 98.05.43.10  $$.$$ ‌MU234 oil drain plug
018 A24 018 287.137.0.799 90.71.40.62  $$.$$ ‌L419 drain plug gasket
019 C15 019 201.030.0.832 48.08.55.70  $6.00 ‌G373 starter push rod ∅5 x 25
020 C16 020 383.027.0.799 48.08.64.70  $1.50 ‌G369 starter washer ∅5 ∅11.5 x 0.5
021 000 021 203.043.0.799 71.08.32.00  $6.00 G418 clutch clip ring ∅95 x 2.0
000 C17 000 000.000.0.000 48.08.32.70  N/A 0000 clutch clip ring ∅95 x 2.0
022 000 022 263.072.0.799 71.08.28.00  $37.0 G415 starter disk
023 C19 023 264.026.0.799 92.70.11.13  $2.00 ‌N161 clutch nut M10-1.0 x 8 hex17
024 000 000 000.000.0.000 71.08.00.25  N/A     G 000 Adler (G) clutch assy
000 C14 024 272.002.0.799 00.00.00.00  N/A     G 000 Rimoldi (B) clutch assy = Puch
025 000 000 000.000.0.000 71.08.17.00  N/A     G 000 clutch housing G M30-1.5 int. puller
000 C20 025 774.012.0.799 48.08.35.70  N/A     G374/1 clutch housing B 2 M6-hole puller
026 C21 026 904.013.0.100 90.27.10.15  $1.50 MU3813 circlip external type ∅15
027 C22 027 378.016.0.799 48.08.68.70  $$.$$ ‌G5 washer ∅15 ∅26 x ??
028 000 000 000.000.0.000 71.08.44.25  N/A     G 000 clutch drum with gear G ∅95 id
000 C27 033 719.004.0.799 48.08.44.70  N/A     G416/1 clutch drum with gear B
000 C23 028 793.042.0.799 48.08.19.70  N/A     G7944/1 adjustment screw B
029 000 000 000.000.0.000 71.08.20.00  N/A     G 000 clutch shoe-weight G
000 C24 029 764.001.0.799 48.08.20.70  N/A     G7944/2 clutch shoe-weight B
030 000 000 000.000.0.000 71.08.41.00  $12.0 G 000 circular coil spring G
00 0C25 030 759.025.0.799 48.08.35.70  N/A     G7944/3 coil spring B
031 000 000 000.000.0.000 71.08.26.00  $9.00 G 000 triangular spring plate G
000 000 031 904.008.0.100 90.27.10.10  $1.50 MU8153 circlip B external type ∅10
032 C41 02A 000.000.0.000 48.80.24.70  $3.00 M277  start cable pinch bolt for 1P P20 photo
000 000 032 719.003.0.799 01.01.01.01  N/A     G416 clutch drum bare B
034 000 034 300.028.0.815 48.07.04.70  N/A     G2 drive gear 21 teeth
035 C28 035 218.034.0.815 48.07.03.70  $$.$$ ‌G3 clutch drum bushing 15-??-??
036 C30 036 218.037.0.815 48.08.38.70  $$.$$ ‌N18 clutch spacer with lip 15-20-??
038 C31 038 264.024.0.799 48.21.92.70  $$.$$ ‌L837 right drive shaft nut
039 C32 039 300.029.0.815 48.21.58.70  N/A     N21 driven gear 71 teeth
040 A31 040 903.030.0.100 90.27.20.35  none   N12 circlip internal type ∅35
041 A34 041 922.008.0.100 92.20.11.17  $10.0 ‌MU7038/1 right drive shaft bearing #6003 17-35-10
042 C33 042 958.009.0.143 91.70.13.50  $$.$$ ‌MU164 drive shaft woodruff key
043 C34 043 200.013.0.815 48.21.36.70  N/A     N19 drive shaft
044 A35 044 922.015.0.100 92.20.12.15  $10.0 ‌MU86/1 left drive shaft bearing #6202 15-35-11
045 A36 045 900.119.0.200 90.40.25.35  $5.00 ‌N34 drive shaft seal 25-35-7
046 C35 046 303.008.0.815 48.33.05.70  N/A     N20/1 sprocket 11 tooth
047 C36 047 264.023.0.799 92.70.11.22  $$.$$ ‌U124 sprocket nut
048 A26 048 982.052.0.126 98.62.03.50  $1.40 ‌MU1230 case bolt M6 x 50 allen black
049 A25 049 982.053.0.126 98.62.03.55  $0.80 ‌G 000  case bolt M6 x 55 allen black
050 A27 050 287.045.0.799 48.00.17.70  $12.0 ‌N25 trans cover gasket
051 A28 051 235.008.0.815 48.00.11.70  N/A     N3 right case half
052 A29 052 368.022.0.815 35.00.20.00  $$.$$ ‌G507  centering dowel-tube ∅11
053 A30 053 900.090.0.200 90.40.20.35  $7.00 ‌N33 right crank seal 20-35-7
054 A32 054 922.014.0.100 92.20.12.16  $10.0 ‌MU86 L and R crank bearing #6202C3 15-35-11
055 C13 055 958.007.0.143 91.60.03.37  $1.50 ‌MU3817 clutch woodruff key M86 3 x 5 x 12.3
056 000 056 425.013.0.815 48.00.11.70  N/A     N159 right crank half
057 000 057 370.009.0.815 48.06.50.70  N/A     G633 crank pin
058 000 058 215.021.0.815 48.06.16.70  N/A     G628 con rod
059 000 059 290.006.0.799 92.25.22.21  N/A     G327 rod bearing
060 000 060 425.015.0.815 48.06.43.70  N/A     N136 left crank half
061 C12 061 958.006.0.143 91.60.02.38  $2.00 ‌G7274 flywheel woodruff key M81  2.0 x 3.7
062 A33 062 900.051.0.200 90.40.15.35  $7.00 ‌N11 left crank seal 15-35-7 orig: 15-35-10
063 A37 063 287.044.0.799 48.00.09.70  $12.0 ‌N24 case gasket
064 A45 064 287.138.0.799 90.71.40.80  $$.$$ ‌L493 vent ring gasket
065 A44 065 000.000.0.000 48.00.46.71  N/A     L492 transmission case vent
066 A39 066 288.059.0.799 91.55.10.70  N/A     UI281 magneto wires grommet
067 A38 067 235.010.0.815 48.00.08.70  N/A     N2 left case half  use set #147
068 D10 068 983.042.0.125 98.20.04.10  $1.30 MU1147 stator plate screw M4 x 10 slot
069 A40 069 984.075.0.125 98.28.06.14  none   N7 screw M6 x 14 slot-sunk
070 A41 070 247.036.0.815 48.00.04.70  N/A     N6 magneto cover base
   Dansi magnetos: all ∅82 id rotors and ∅94 od stators:  IIN means Internal spark, Int. ground, No brake light
.G#  R#  B#  00 1975# 0000  1980# 0   price 01970#   EEB means External spark, Ext. ground, Brake light
000 D09 071 427.027.0.799 48.71.24.71  N/A     N14 magneto B,R 100892 ∅110 ⇒ alum. IIN
000 D09 071 427.027.0.799 48.71.24.71  N/A     N14 on ’67-75? Benelli Gentleman, Bobo, Guzzi Chiu (Euro)
00 0D09 530 000.000.0.000 48.71.24.90  N/A     G00 magneto B,R 101441 ∅103 ⇒ steel EIB
00 0D09 530 000.000.0.000 48.71.24.90  N/A     G00 on ’76-77  Benelli Blazer, Guzzi Robin (some)
071 D09 000 000.000.0.000 71.71.24.25  N/A     G00 magneto G,R 101813 ∅103 ⇒ steel EEB 
071 D09 000 000.000.0.000 71.71.24.25  N/A     G00 on ’77-80  Benelli G2, Guzzi Robin (some)
072 C11 072 971.301.0.210 95.10.12.75  $2.00 ‌UI7091 plain washer ∅9 x 13
073 C10 073 970.029.0.149 95.02.11.09  $1.80 ‌N28 toothed washer ∅9 x 13
074 C09 074 264.025.0.799 48.71.95.70  $9.50 ‌UI7090 flywheel nut     photo M9-1.0, hex14 x 6 with ∅13 x 10
074 C09 074 264.025.0.799 48.71.95.70  $0.00 ‌uses a 14 mm socket that fits outside the flywheel center hole
074 C09 074 010.010.0.100 01.01.01.01  $7.00 ‌2050118446 substitute photo M9-1.0, hex12 x 9 for Garelli
074 C09 074 010.010.0.100 01.01.01.01  $0.00 ‌uses a 12 mm socket that fits inside the flywheel center hole
075 000 075 247.027.0.820 48.00.03.71  N/A    ‌ G7775  magneto cover aluminum 126 id
000 A42 000 010.010.0.101 48.00.03.70  N/A    ‌ G0000  magneto cover aluminum 126 id
000 D13 076 288.086.0.799 45.71.76.00  N/A     G 00  spark plug cap rubber boot
077 C05 077 290.003.0.799 92.25.20.12  $11.0 ‌LB157 piston needle bearing 12-15-15
078 C03 078 397.007.0.815 48.06.12.70  $11.0 ‌LB156 piston pin ∅12 x 31?
079 C04 079 903.007.0.100 90.27.20.12  $1.50 ‌MU339 piston clip ∅12
080 000 000 000.000.0.000 70.06.04.00  $47.0 G7346 piston G bare dome top hi-comp use #100
000 C02 080 356.063.0.799 71.06.04.10  N/A     N257 piston B bare  flat top  lo-comp  use #100
081 C01 081 208.010.0.799 48.06.08.70  $10.0 ‌G7347/S   piston ring Std 40.0 x 1.5 GN
081 C01 081 700.007.0.799 48.06.08.72  $22.0 G7347/S2 piston ring 1os 40.2 x 1.5 GN
081 C01 081 700.008.0.799 48.06.08.74  none   G7347/S4 piston ring 2os 40.4 x 1.5 GN
081 C01 081 700.009.0.799 48.06.08.76  $16.0 G7347/S6 piston ring 3os 40.6 x 1.5 GN
082 A12 082 287.043.0.799 48.02.08.70  $6.00 ‌N23 base gasket
083 A08 083 234.063.0.815 48.02.03.70  $$.$$ ‌G321 cylinder
084 A13 084 359.138.0.799 96.50.61.05  $4.00 ‌G7483 cylinder stud M6 x 105
085 A14 085 967.036.0.110 95.00.02.06  $0.20 ‌MU332 head washer ∅6
086 A09 086 935.017.0.116 92.60.22.06  $0.30 ‌MU280 head & ex. nut M6
087 A07 087 287.009.0.799 48.02.20.70  $7.00 ‌G7010 head gasket
088 A01 088 400.038.0.815 48.02.24.70  N/A     N322 head
089 D14 089 928.008.0.200 35.71.70.00  none  ‌G 00 spark plug W175T2 = W7C = NGK BR6ES
090 A03 090 287.011.0.799 48.11.59.70  $7.50 ‌G7015/1 intake gasket ∅6 x 34
091 A04 091 287.042.0.799 48.11.55.70  $9.00 N15 intake spacer good-used ∅6 x 34 x 4
092 A02 092 000.000.0.000 48.11.50.70  $26.0 ‌N24 intake G,R used ∅6 x 34, ∅12 x ∅18
000 000 092 232.011.0.799 00.00.00.00  N/A     N27 intake Blazer     ∅6 x 34, ∅10? x ∅18
093 A05 093 982.046.0.126 98.62.23.20  $0.70 ‌MU8034 intake screw M6 x 20 allen
094 000 000 000.000.0.000 71.11.26.11  N/A     G 0  carburetor G Dellorto SHA 14/9 jet 44
000 B05 094 239.048.0.799 48.11.26.70  N/A     G 0  carburetor B Dellorto SHA 14/9 jet 45
095 A11 095 359.108.0.799 96.50.60.26  $2.00 ‌UI7496 exhaust stud M6 x 26
096 A10 096 968.011.0.249 61.01.38.00  $0.25 ‌MU18  exhaust washer ∅6
097 B02 097 287.046.0.799 48.12.03.70  $6.50 ‌N30 exhaust gasket 6 x 40
098 000 000 000.000.0.000 00.00.00.00  $70.0 ‌000   long 2-piece exhaust G
000 B01 098 392.004.0.715 48.12.04.70  N/A     N251/1 pancake exhaust B
099 C07 099 712.002.0.799 48.06.14.70  N/A     G628/A connecting rod assy needle bearing

100 000 000 000.000.0.000 70.06.02.20  N/A     ‌G7346/C    piston assy Std 40.0 Asso domed  8.5 cr
100 000 100 000.000.0.000 70.06.02.22  N/A     G7346/C2  piston assy 1os 40.2 Asso domed  8.5 cr
100 000 100 000.000.0.000 70.06.02.24  N/A     G7346/C4  piston assy 2os 40.4 Asso domed
100 000 100 000.000.0.000 70.06.02.26  N/A     G7346/C6  piston assy 3os 40.6 Asso domed 
000 C08 100 771.006.0.799 71.06.02.10  $65.0 ‌N257/C     piston assy Std  40.0 GOL  flat top 7.9 cr
000 C08 100 771.007.0.799 71.06.03.10  N/A     N257/C2    piston assy 1os 40.2 Asso flat top
000 C08 100 771.008.0.799 71.06.03.11  N/A     N257/C4    piston assy 2os 40.4 Asso flat top
000 C08 100 771.009.0.799 71.06.03.12  N/A     N257/C6    piston assy 3os 40.6 Asso flat top

101 000 000 000.000.0.000 14.71.74.00  $9.00 G7096/1  spark plug cap metal shielded modern
000 000 101 000.000.0.000 35.71.74.70  $9.00 G7096/1  same
00 0D12 000 000.000.0.000 45.71.74.00  $6.00 G00000   spark plug cap plastic modern
102 000 000 000.000.0.000 69.70.22.07  N/A    G00000   stator plate G ∅94 3 + 2 slot
000 000 102 772.006.0.799 00.00.00.00  N/A     SD462/3 stator plate B ∅94 3 + 2 slot same as GM
103 D15 103 742.005.0.799 48.70.95.70  N/A     G221/11  felt greaser
104 D20 104 793.007.0.799 35.70.79.00  $1.50 G221/3  points screw M4 x 8 small head
105 000 105 723.002.0.799 35.70.86.00  G221/6 = G26/2  condenser M17T
000 D16 000 000.000.0.000 48.70.86.70  G26/2  = G221/6 condenser M17T
106 000 000 000.000.0.000 71.71.50.25  N/A     G000  (lower) ignition source coil G M27
000 D18 106 713.006.0.799 48.71.50.70  N/A     N14/B (lower) internal spark coil B
000 000 529 000.000.0.000 48.71.50.90  $65.0 G0000(lower) ignition source coil B5 M20
107 D17 107 779.014.0.799 48.70.88.70  $16.0 SD462/2  points 1-piece M18
108 000 000 000.000.0.000 71.71.51.25  $65.0 G000/0 (upper) lights coil G M28 6V 25W
000 D19 108 713.005.0.799 48.71.51.70 N/A     N14/C  (upper) lights coil B
00 0000 527 000.000.0.000 48.71.51.90  $65.0 G0000  (upper) lights coil B5 M21 6V 15/10W
109 000 109 776.013.0.799 70.71.89.20  $0.40 G221/8  coil washer M4 thin lock washer
110 000 110 793.041.0.799 35.71.57.50  $1.20 G221/7   coil screw M4 x 25 slot
000 D20 000 000.000.0.000 48.71.57.50  $1.60 G0000   coil screw and washer M4 x 25
111 000 000 000.000.0.000 71.71.21.25  N/A     G000    flywheel rotor G ∅82 ∅103 Dansi 101813 ⇒
000 D00 111 780.003.0.799 00.00.00.00  N/A     N14/A   flywheel rotor B ∅82 ∅110 Dansi 100892 ⇒
000 000 548 000.000.0.000 48.71.16.81  N/A     G000    flywheel rotor B5 82 ∅103 Dansi 101441 ⇒
112 D20 112 783.006.0.799 48.71.57.70  N/A     SD404/1  screws and washers
113 C06 113 223.013.0.818 48.06.40.70  N/A     N325  crankshaft assembled
114 to 143  see Dellorto Carburetors
144 000 000 273.119.0.799 71.11.75.10  $10.0 FA3709/1  throttle cable gray   1-end, 33 x 38″
000 B06 144 000.000.0.000 48.11.75.70  $10     G00000    throttle cable black 1-end, 33 x 38″
145 A47 145 783.008.0.799 48.99.95.70  $21.0 G243/6  seal set 3-piece 15-35-7, 20-30-7, 25-35-7
146 A46 146 783.007.0.799 48.99.90.70  N/A     G242/6  gasket set 7-piece
147 A48 147 235.007.0.816 48.00.01.70  N/A     N37       case set 2-piece

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Benelli Blazer-US: The USA version of the Bobo had the same parts catalog B1 to B4, except for the last page B5 that showed all of the changes. The controls (and start cable) changed from Domino to PV. A CEV 60mm speedometer, cable and driver were added. The CEV 2139 “bullet” headlight was round, bigger, brighter and required more watts. The CEV 9350 tail light also was bigger, brighter and required more watts. The 6V 21/5W #1154 bulb had a brake light and the lens had side reflectors. The switches were CEV round chrome clamp-on type, with English language labels. Right thumb operates engine stop. Left thumb operates lights and horn. The Blazer magneto generated more watts.  

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

G2K partial parts list:

 M#  E# 000  1975# 0000  1980# 0    price 0 1970# 0 description        specs
048 048 357.003.0.799 71.26.25.00  $8.00 G 0000  kick start rubber says Motobi
   Dansi magnetos: all ∅82 id rotors and ∅94 od stators:  IIN means Internal spark, Int. ground, No brake light
 M#  E# 000  1975# 0000  1980# 0   price 0 1970#       EIN means External spark, Int. ground, No brake light
000 000 000.000.0.000 00.00.00.00  N/A     G00 magneto 0 ADP44  ∅110 ⇒ IIN ’70-75? Gentleman kick 60
070 000 427.022.0.799 00.00.00.00  N/A     G00 magneto M 100833∅103 ⇒ EIN ’73-76? Motorella
000 070 000.000.0.000 48.71.24.72  N/A     G00 magneto E 101662 ∅103 ⇒ EIN ’76-80? G2 Elle, Motorella
095 098 928.008.0.200 35.71.70.00  none  ‌B1348/2 spark plug  = NGK BR6ES
099 099 359.108.0.799 96.50.60.26  $2.00 ‌UI7496 exhaust stud M6 x 26
100 100 287.046.0.799 48.12.03.70  $6.00 ‌N30 exhaust gasket
165 000 771.006.0.799 00.00.00.00  N/A     ‌N257/C     piston assy Std 40.0 x 17-12-18
165 063 000.000.0.000 70.06.02.20  $65.0 ‌G7346/C    piston assy Std 40.0 x 17-12-18 GOL
166 065 712.002.0.799 48.06.16.70  N/A     G628/A connecting rod assy
167 000 223.014.0.815 00.00.00.00  N/A     G0000 crankshaft M assembled
000 112 000.000.0.000 71.06.40.00  N/A     G0000 crankshaft E assembled