Benelli G2 G2K

January 30, 2021

updated 2020-03

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.

Benelli G2 engine 49cc (40 x 39) gears 21/71

Dual left chain drive

G2 dual left chain drive
motor sprockets 12/46

 

 

 

 

 

 

 

 

G. 77-80 G2 
1.5 hp, 8.5 cr

G. 1978 G2 (UK)
1.37 hp, 8.0 cr

G 77-80 Guzzi Robin
1.5 hp, 8.5 cr

B. 76-77 Blazer

B 76-77 Guzzi Robin

 

 

 

 

 

 

 

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.

 

1970 Benelli Gentleman

1970 Benelli Gentleman

1976 Benelli Gentleman

 

 

 

 

 

 

 

 

’78 Benelli Motorella
40 x 39, 1.3hp, 8.5cr
gears 22/70
sprockets 11/46

1978 Benelli G2 Elle
40 x 39, 1.36hp, 7.9cr
gears 22/70
sprockets 9/48

1978 Benelli G2 KS
40 x 39, 1.36hp, 7.9cr
gears 22/70
sprockets 9/48

 

 

 

 

 

 

 

 

 

 


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

PV controlsVeglia smallBenelli 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 two parts catalogs “G” and “B” are combined into one list.

B ’76-77 Blazer-US, 70’s Bobo 1970# 1975#

G 1977-80 Benelli G2-US, with 1970# 1980#

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

G. Adler clutch
also on Demm

G. PV controls

B. Rimoldi clutch
also on Puch

B. Domino
on Bobo

B. PV on
Blazer

 

 

 

 

 

 

 

 

 

 

G1. list

G1. Benelli G2-US G2 engine parts

B1. list

B1. Benelli Bobo (Blazer-US) G2 engine

 

 

 

 

 

 

 

 

 

 

G. Start cable for
PV controls

.G B#  00 1975# 0000  1980# 0   price 0 1970# 0 description        specs
00
1 000 000.000.0.000 71.80.15.25  N/A     ‌G000000 start cable 2P 2 ends ∅7 φ6 52 x ?

000
001 239.127.0.799 00.00.00.00  $10.0FA3706/8 start cable 1L 1 ended φ6  52 x 57″
00
1 000 000.000.0.000 00.00.00.00  $10.0FA0000/0 start cable 1P 1 ended ∅7  52 x 57″
002 002 225.005.0.815 48.80.18.70  $0.50 ‌G7191 start cable stop cap  for 1P F5C photo 
003 003 326.044.0.799 48.80.25.70  $4.00 G10 start cable spring subst. 6.5-7.0 id x 60-75
004 004 438.001.0.817 48.09.39.70  N/A     G7947/C start lever-shaft ∅11
005 005 901.032.0.200 90.70.61.07  $$.$$G4 start shaft seal ring
006 006 314.012.0.832 48.08.76.70  $14.0 ‌G7948 start lever inner
007 007 904.009.0.100 90.27.10.11  $2.00 ‌G7949 start shaft circlip 11 x 1.0
008 008 247.038.0.826 48.00.16.70  N/A     N8 clutch cover
009 009 982.048.0.126 98.62.03.30  $1.00 ‌MU1224 cover screw M6x30 allen black
010 010 982.051.0.126 98.62.03.45  $1.20 ‌MU3732 cover screw M6x45 allen black
011 011 328.127.0.799 48.01.55.81  N/A     G 000 Benelli emblem
013 013 917.043.0.125 98.05.23.30  $0.60 ‌H8103 cover and ex. bolt M6 x 30 hex
014 014 970.021.0.149 95.02.11.06  $0.25 ‌G 000 toothed washer ∅6
0
15 015 221.010.0.799 39.01.88.00  $$.$$UI189 oil filler and check plug
016 016 383.010.0.799 90.71.41.26  $$.$$L418 check plug gasket
017 017 916.074.0.125 98.05.43.10  $$.$$MU234 oil drain plug
018 018 287.137.0.799 90.71.40.62  $$.$$L419 drain plug gasket
019 019 201.030.0.832 48.08.55.70  $6.00G373 starter push rod ∅5 x 25
020 020 383.027.0.799 48.08.64.70  $1.50G369 starter washer ∅5 ∅11.5 x 0.5

B. Start cable for
Domino controls

021 021 203.043.0.799 71.08.32.00  $6.00 G418 clutch clip ring ∅95 x 2.0
022 022 263.072.0.799 71.08.28.00 $37.0 G415 starter disk
023 023 264.026.0.799 92.70.11.13  $$.$$N161 clutch nut
024 000 000.000.0.000 71.08.00.25  N/A     G 000 Adler (G) clutch assy
000 024 272.002.0.799 00.00.00.00  N/A     G 000 Rimoldi (B) clutch assy = Puch
025 000 000.000.0.000 71.08.17.00  N/A     G 000 clutch housing G M30-1.5 int. puller
000 025 774.012.0.799 00.00.00.00  N/A     G374/1 clutch housing B 2 M6-hole puller
026 026 904.013.0.100 90.27.10.15  $1.50 MU3813 circlip external type ∅15
027 027 378.016.0.799 48.06.68.70  $$.$$G5 washer ∅15 ∅26 x ??
028 000 000.000.0.000 71.08.44.25  N/A     G 000 clutch drum bare G ∅95 id
000 028 793.042.0.799 00.00.00.00  N/A     G7944/1 adjustment screw B
029 000 000.000.0.000 71.08.20.00  $23.0 G 000 clutch shoe-weight G
000 029 764.001.0.799 00.00.00.00  N/A     00 00 clutch shoe-weight B
030 000 000.000.0.000 71.08.41.00  $12.0 G 000 circular coil spring G
000 030 759.025.0.799 00.00.00.00  N/A     G7944/3 coil spring B
031 000 000.000.0.000 71.08.26.00  $9.00 G 000 triangular spring plate G
000 031 904.008.0.100 00.00.00.00  N/A     MU8153 circlip B
032 02A 000.000.0.000 48.80.24.70  $3.00 M277  start cable pinch bolt for 1P P20 photo
000 032 719.003.0.799 00.00.00.00  N/A     G416 clutch drum bare B
000 033 719.004.0.799 00.00.00.00  N/A     G416/1 clutch drum with gear B
034 034 300.028.0.815 48.07.04.70  N/A     G2 drive gear
035 035 218.034.0.815 48.07.03.70  $$.$$G3 clutch drum bushing 15-??-??
036 036 218.037.0.815 48.08.38.70  $$.$$N18 clutch spacer with lip 15-20-??
038 038 264.024.0.799 48.21.92.70  $$.$$L837 drive shaft nut
039 039 300.029.0.815 48.21.58.70  N/A     N21 driven gear
040 040 903.030.0.100 90.27.20.35  none   N12 circlip internal type ∅35
041 041 922.008.0.100 92.20.11.17  $10.0 ‌MU7038/1 right drive shaft bearing #6003 17-35-10
042 042 958.009.0.143 91.70.13.50  $$.$$MU164 drive shaft woodruff key
043 043 200.013.0.815 48.21.36.70  N/A     N19 drive shaft
044 044 922.015.0.100 82.20.12.15  $8.00 ‌MU86/1 left drive shaft bearing #6202 15-35-11
045 045 900.119.0.200 90.40.25.35  $5.00 ‌N34 drive shaft seal 25-35-7
046 046 303.008.0.815 48.33.05.70  N/A     N20/1 sprocket 12 tooth
047 047 264.023.0.799 92.70.11.22  $$.$$U124 sprocket nut
048 048 982.052.0.126 98.62.03.50  $1.40MU1230 case bolt M6 x 50 allen black
049 049 982.053.0.126 98.62.03.55  $0.80 ‌G 000  case bolt M6 x 55 allen black
050 050 287.045.0.799 48.00.17.70  $12.0 ‌N25 trans cover gasket
051 051 235.008.0.815 48.00.11.70  N/A     N3 right case half
052 052 368.022.0.815 35.00.20.00  $$.$$G507  centering dowel-tube ∅11
053 053 900.090.0.200 90.40.20.35  $7.00 ‌N33 right crank seal 20-35-7
054 054 922.014.0.100 92.20.12.16  $12.0 ‌MU86 L and R crank bearing #6202C3 15-35-11
055 055 958.007.0.143 91.60.03.37  $1.50 ‌MU3817 clutch woodruff key M86 3 x 5 x 121.3
056 056 425.013.0.815 48.00.11.70  N/A     N159 right crank half
057 057 370.009.0.815 48.06.50.70  N/A     G633 crank pin
058 058 215.021.0.815 48.06.16.70  N/A     G628 con rod
059 059 290.006.0.799 92.25.22.21  N/A     G327 rod bearing
060 060 425.015.0.815 48.06.43.70  N/A     N136 left crank half
061 061 958.006.0.143 91.60.02.38  $2.00 ‌G7274 flywheel woodruff key M81 2.0 x 3.7
062 062 900.051.0.200 90.40.15.35  $7.00 ‌N11 left crank seal 15-35-7 orig: 15-35-10
063 063 287.044.0.799 48.00.09.70  $12.0 ‌N24 case gasket
064 064 287.138.0.799 90.71.40.80  $$.$$L493 vent ring gasket
065 065 000.000.0.000 48.00.46.71  N/A     L492 transmission case vent
066 066 288.059.0.799 91.55.10.70  N/A     UI281 magneto wires grommet
067 067 235.010.0.815 48.00.08.70  N/A     N2 left case half
068 068 983.042.0.125 98.20.04.10  $1.30 MU1147 stator plate screw M4 x 10 slot
069 069 984.075.0.125 98.28.06.14  none   N7 screw M6 x 14 slot-sunk
070 070 247.036.0.815 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
.0 G0  B#  00   1975# 0000  1980# 0   price 01970  EEB means External spark, Ext. ground, Brake light
0
1-00 01-71 427.027.0.799 48.71.24.71  N/A     N14 magneto B 100892 ∅110 ⇒ IIN ’67-75? Gentleman, Bobo
01-00 05-30 000.000.0.000 48.71.24.90  N/A     G00 magneto B5 101441 ∅103⇒EIB ’76-77  Blazer, Guzzi Robin

0
1-71 01-00 000.000.0.000 71.71.24.25  N/A     G00 magneto G 101813 ∅103 ⇒ EEB ’77-80  G2, Guzzi Robin

01-72 01-72 971.301.0.210 95.10.12.75  $0.20 ‌UI7091 plain washer ∅8.5 
01-73 01-73 970.029.0.149 95.02.11.09  $1.80 ‌N28 toothed washer 9 x 17
01-74 01-74 264.025.0.799 48.71.95.70  $7.50UI7090 flywheel nut M9-1.0 x 16 hex14x6 ∅13×10
01-75 01-75 247.027.0.820 48.00.03.71  N/A   G7775  magneto cover aluminum 126 id
01-00 0
1-76 288.086.0.799 00.00.00.00  N/A     G 00  plug wire grommet for internal-spark magnetos
01-77 01-77 290.003.0.799 92.25.20.12  $11.0LB157 piston needle bearing 12-15-15
01-78 01-78 397.007.0.815 48.06.12.70  $11.0LB156 piston pin ∅12 x 31?
01-79 01-79 903.007.0.100 90.27.20.12  $1.50 ‌MU339 piston clip ∅12
01-80 01-00 000.000.0.000 70.06.04.00  $47.0 G7346 piston G bare dome top hi-comp use #100
01-00 01-80 356.063.0.799 00.00.00.00  N/A     N257 piston B bare  flat top  lo-comp  use #100
01-81 01-81 208.010.0.799 48.06.08.70  $10.0 ‌G7347/S   piston ring Std 40.0 x 1.5 GN
01-
81 01-81 700.007.0.799 48.06.08.72  $22.0 G7347/S2 piston ring 1os 40.2 x 1.5 GN
01-
81 01-81 700.008.0.799 48.06.08.74  none   G7347/S4 piston ring 2os 40.4 x 1.5 GN
01-
81 01-81 700.009.0.799 48.06.08.76  $16.0 G7347/S6 piston ring 3os 40.6 x 1.5 GN
01-82 01-82 287.043.0.799 48.02.08.70  $6.00N23 base gasket
01-83 01-83 234.063.0.815 48.02.03.70  $$.$$G321 cylinder
01-84 01-84 359.138.0.799 96.50.61.05  $4.00 ‌G7483 cylinder stud M6 x 105
01-85 01-85 967.036.0.110 95.00.02.06  $0.20 ‌MU332 head washer ∅6
01-86 01-86 935.017.0.116 92.60.22.06  $0.40 ‌MU280 head & ex. nut M6
01-87 01-87 287.009.0.799 48.02.20.70  $7.00 ‌G7010 head gasket
01-88 01-88 400.038.0.815 48.02.24.70  N/A     N322 head
01-89 01-89 928.008.0.200 35.71.70.00  $3.00 ‌G 00 spark plug W175T2 = W7C = NGK B6ES now BR6ES
01-90 01-90 287.011.0.799 48.11.59.70  $7.50 ‌G7015/1 intake gasket ∅6 x 34
01-91 01-91 287.042.0.799 48.11.55.70  $9.00 N15 intake spacer good-used ∅6 x 34 x 4
01-92 01-92 000.000.0.000 48.11.50.70  $26.0N24 intake pipe G good-used ∅6 x 34  ∅12 id
01-00 01-92 232.011.0.799 00.00.00.00  N/A     N27 intake pipe B ∅6 x 34  ∅11? id
01-93 01-93 982.046.0.126 98.62.23.20  $0.70 ‌MU8034 intake screw M6 x 20 allen
01-94 01-00 000.000.0.000 71.11.26.11  N/A     G 0  carburetor G Dellorto SHA 14/9 jet 44
01-00 01-94 239.048.0.799 00.00.00.00  N/A     G 0  carburetor B Dellorto SHA 14/9 jet 45
01-95 01-95 359.108.0.799 96.50.60.26  $2.00 ‌UI7496 exhaust stud M6 x 26
01-96 01-96 968.011.0.249 61.01.38.00  $0.25 ‌MU18  exhaust washer ∅6
01-97 01-97 287.046.0.799 48.12.03.70  $6.50 ‌N30 exhaust gasket 6 x 40
01-98 01-00 000.000.0.000 00.00.00.00  $70.0000   long 2-piece exhaust G
01-00 01-98 392.004.0.715 00.00.00.00  N/A     N251/1 pancake exhaust B
01-99 01-99 712.002.0.799 48.06.14.70  N/A     G628/A connecting rod assy

1-100 1-000 000.000.0.000 70.06.02.20  $65.0 ‌G7346/C    piston assy Std 40.0 GOL  flat top 7.9 cr
1-100 1-100 000.000.0.000 70.06.02.22  N/A     G7346/C2  piston assy 1os 40.2 Asso flat top
1-100 1-100 000.000.0.000 70.06.02.24  N/A     G7346/C4  piston assy 2os 40.4 Asso flat top
1-100 1-100 000.000.0.000 70.06.02.26  N/A     G7346/C6  piston assy 3os 40.6 Asso flat top
1-000 1-100 771.006.0.799 00.00.00.00  N/A     ‌N257/C 
    piston assy Std  40.0 Asso domed  8.5 cr
1-000 1-100 771.007.0.799 00.00.00.00  N/A     N257/C2    piston assy 1os 40.2 Asso domed
1-000 1-100 771.008.0.799 00.00.00.00  N/A     N257/C4    piston assy 2os 40.4 Asso domed
1-000 1-100 771.009.0.799 00.00.00.00  N/A     N257/C6    piston assy 3os 40.6 Asso domed

1-101 1-000 000.000.0.000 14.71.74.00  $8.00 G7096/1  spark plug cap metal shielded good-used
1-000 1-101 000.000.0.000 35.71.74.70  $6.00 G7096/1  spark plug cap plastic modern
1-102 1-000 000.000.0.000 69.70.22.07  N/A    G00000   stator plate G ∅94 3 + 2 slot
1-000 1-102 772.006.0.799 00.00.00.00  N/A     SD462/3 stator plate B ∅94 3 + 2 slot same as GM
1-103 1-103 742.005.0.799 48.70.95.70  N/A     G221/11  felt greaser
1-104 1-104 793.007.0.799 35.70.79.00  $1.50 G221/3  points screw M4 x 8 small head
1-105 1-105 723.002.0.799 35.70.86.00  $15.0 G221/6 = G26/2  condenser M17T
1-106 1-000 000.000.0.000 71.71.50.25  N/A     G000  (lower) ignition source coil G M27
1-000 1-106 713.006.0.799 00.00.00.00  N/A     N14/B (lower) internal spark coil B
1-000 05-29 000.000.0.000 48.71.50.90  $65.0 G0000(lower) ignition source coil B5 M20
1-107 1-107 779.014.0.799 48.70.88.70  $16.0 SD462/2  points 1-piece M18
1-108 1-000 000.000.0.000 71.71.51.25  $65.0 G000/0 (upper) lights coil G M28 6V 25W
1-000 1-108 713.005.0.799 00.00.00.00  N/A     N14/C  (upper) lights coil B
1-000 05-27 000.000.0.000 48.71.51.90  $65.0 G0000  (upper) lights coil B5 M21 6V 15/10W
1-109 1-109 776.013.0.799 70.71.89.20  $0.40 G221/8  coil washer M4 thin lock washer
1-110 1-110 793.041.0.799 35.71.57.50  $1.20 G221/7   coil screw M4 x 25 slot
1-111 1-000 000.000.0.000 71.71.21.25  N/A     G000    flywheel rotor G ∅82 ∅103 Dansi 101813
1-000 1-111 780.003.0.799 00.00.00.00  N/A     N14/A   flywheel rotor B ∅82 ∅110 Dansi 100892 ⇒
1-000 05-48 000.000.0.000 48.71.16.81  N/A     G000    flywheel rotor B5 82 ∅103 Dansi 101441

1-112 1-112 783.006.0.799 48.71.57.70  N/A     SD404/1  screws and washers
1-113 1-000 000.000.0.000 48.06.40.70  N/A     N325  crankshaft G assembled
1-000 1-113 223.013.0.818 00.00.00.00  N/A    G000   crankshaft B assembled
1-114 to 143  see Dellorto Carburetors
1-144 1-144 273.119.0.799 71.11.75.10  $10.0 FA3709/1  throttle cable 1-end, 33 x 38″
1-145 1-145 783.008.0.799 48.99.45.70  $18.0 G243/6  seal set 3-piece 15-35-7, 20-30-7, 25-35-7
1-146 1-146 783.007.0.799 48.99.90.70  $39.0 G242/6  gasket set 7-piece
1-147 1-147 235.007.0.816 48.00.01.70  N/A     N37       case set 2-piece

B2. list

 

G2. list

G2. Benelli G2-USA frame parts

B2. Benelli Bobo (Blazer) frame parts

 

 

 

 

 

 

 

 

 

B3. list

G3. list

G3. Benelli G2-USA body parts

B3. Benelli Bobo (Blazer) body parts

 

 

 

 

 

 

 

 

 

B4. list

G4. list

G4. Benelli G2 wheels and controls

B4. Benelli Bobo wheels and controls

 

 

 

 

 

 

 

 

 

 

B5. list

B5. Benelli 1977 Blazer changes

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 Veglia 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.  

 

 

 

 

 

 

M1. list

M1. Benelli Motorella G2K engine parts

E1. Benelli G2 Elle G2K engine parts

 

 

 

 

 

 

 

 

 

 

 

 

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

0
00 070 000.000.0.000 48.71.24.72  N/A     G00 magneto E101662 ∅103 ⇒ EIN ’76-80? G2 Elle, Motorella
099 099 359.108.0.799 96.50.60.26  $2.00UI7496 exhaust stud M6 x 26
100 100 287.046.0.799 48.12.03.70  $6.00N30 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  $65.0G7346/C    piston assy Std 40.0 x 17-12-18 GOL
166 065 712.002.0.799 48.06.14.70  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