Benelli GM GK GK65

Benelli models with GM, GK engines 1965-73

1967 Gentlemen moped

49cc horizontal cylinder 1-speed, automatic clutch

1965 Gentlemen moped
GM engine, 2.25-16 tires

 

Benelli GM engine 49cc (40 x 39mm)

 

 

 

 

 

 

GM engine (Gentlemen Monomarcia 49cc) is on the 1965-69 Benelli Gentlemen (Italy model), father of the Benelli G2. It is also on the 1969 Benelli Maverick (US model), a front-gas-tank version of the Gentlemen. Notice the 1967 spelling of Gentlemen, not Gentleman. The Gentlemen spelling appears in several late 60’s official publications. 1970 official brochures said Gentleman. See Benelli’s with G2, G2K engines. Here we will use Gentlemen for 1960’s and Gentleman for 1970’s. 

The GM engine has a Dansi MDP44 magneto and front-facing Dellorto SHA 14/9 carburetor. It does not have internal pedals. Instead both motor and pedal chains are on the left side, very unusual.

GK (Gentlemen Kickstart 49cc) engines are on US-model mini-cycles. The kick models do not have pedals or a pedal chain.  The GK and GK-65 engines have a two-piece transmission cover, different than a GM one-piece. They do not have pedals or a pedal chain.

USA mini-cycles with GK and GK65 engines have Dansi ADP244S magnetos and front-facing carburetors, Dellorto SHA 14/12.

The Gentleman had a Domino left control with a start lever, instead of a left twist grip start control like the 1965-69 Wards Riverside had. It is visible in the photo. So it’s in bicycle mode all the time, until you pull the start lever.

Benelli GM parts

GM partial parts list:

00#  price 0 1980# 0000 1970# 00000 description        specs
001 $10.0
70.09.30.10 G244/20 start cable for lever control 1L 52 x 57″
001 $00.0 ‌ 70.09.30.10 G244/20 146, 147, 148, 149, 150 not included
050  N/A     00.00.00.00 N14 magneto assembly Dansi MDP44 82/110 x 94

059  $4.0096.50.61.05 G7483 cylinder stud M6 x 105
060  $0.2095.00.02.06 MU332 head washer ∅6

061  $0.40 ‌92.60.22.06 MU280 head & ex. nut M6

076  $45.0 70.06.04.00 G7346 piston bare dome top hi-comp use #165
077  $0.00 48.06.12.70 G7018 piston pin ∅12 x ?
079  $10.0 ‌48.06.08.70 G7347 0 piston ring Std 40.0 x 1.5 GN
079  $22.0 48.06.08.72 G7347/2 piston ring 1os 40.2 x 1.5 GN
079  none   48.06.08.74 G7347/4 piston ring 2os 40.4 x 1.5 GN
079  $16.0 48.06.08.76 G7347/6 piston ring 3os 40.6 x 1.5 GN
080  $9.0000.00.00.00 N23 base gasket

084  $12.0 ‌48.02.20.70 G7010 head gasket ∅41

088  $2.00 00.00.00.00 UI7496 exhaust stud M6 x 26
090  $65.070.06.02.20 G7346/C   piston assy Std 40.0 x 17-12-18 GOL
090  N/A     70.06.02.22 G7346/C2 piston assy 1os 40.2 x 17-12-18
090  N/A     70.06.02.24 G7346/C4 piston assy 2os 40.4 x 17-12-18
090  N/A     70.06.02.26 G7346/C6 piston assy 3os 40.6 x 17-12-18
092  $6.00 00.00.00.00 G7096 spark plug cap plastic
093  N/A     00.00.00.00 SD462/3 stator plate ∅94 for 01.3239 points
094  N/A     48.70.95.70 G221/11 lubricating felt
095  N/A     35.70.79.00 G221/3 points and cond. screw
096  $15.0 48.70.86.70 G26/2 = G221/6 condenser M17T 07.0074 0.28 μf, ∅18 x 21 photo
097  N/A     00.00.00.00 N14B internal spark coil
098  $21.0 00.00.00.00 SD462/2 points 01.3239 photo
099 
$0.40 70.71.89.20 G221/8 thin lock washer ∅4 x 7 x 0.5
100  $1.20 35.71.57.50 G221/7 coil screw M4 x 25 slot
101  N/A     00.00.00.00 N14/C lights coil
102  N/A     00.00.00.00 N14/A flywheel Dansi MDP44 82 id x 110 od
146 $0.50  48.80.18.70 UI7191  start cable cap subst.  for 1L F5C 
photo
147 $4.00  48.80.25.70 G10       start cable spring subst. 6.5-7.0 id x 60-75
148 $3.00  48.80.24.70 M277     start cable pinch bolt for 1L P20 photo
149 $3.00  70.62.69.20 G000     start lever adjuster   for 1L A3a photo
150 $4.00  00.00.00.00 G000     Domino start lever anchor pin D14a

 

 

Benelli models with GK65 engines 1969-73

59cc horizontal cylinder 1-speed, automatic clutch

Benelli GK65 engine 59cc (44 x 39)

’70-72 Benelli Buzzer

’69-71 Benelli Hornet

 

 

 

 

 

 

 

 

GK65 engine: (Gentlemen Kickstart 59cc) engines are on 1970-73 US-model mini-cycles. The model names say “65” but the actual size was 59cc, not 65cc. The bore and stroke are 44 and 39 mm, so (44/2)*(44/2)*3.14*39/1000 = 59.27 cc. The GK and GK-65 engines have a two-piece transmission cover, different than a GM one-piece. They do not have pedals or a pedal chain.

These have Dansi ADP244S magnetos and front-facing carburetors, Dellorto ME15BS? 

 

 

Benelli GK65 engine parts

GK65 partial parts list

00#   price   1970#    description      specs
071  none   G244/26  start cable
o1A  none   G244/27  start cable
07none   G10  start spring
07$3.00 N277  start pinch bolt P20 photo

050  $0.40 MU280  head & ex nut M6
072  none   N134  magneto complete  Dansi ADP244S 
photo
B82 
none   G421 
piston bare ∅44 use #165
083  $8.00 G424 piston pin ∅12 x ?
084  $1.00 MU339 piston clip ∅12
085  $10.0 G591    piston ring Std 44.0 x 1.5 GN
085  none  G591/2 piston ring 1os 44.2 x 1.5 GN
085  none  G591/4 piston ring 2os 44.4 x 1.5 GN
085  none  G591/6 piston ring 3os 44.6 x 1.5 GN

108  none  G422 head gasket ∅45

110  $4.00 G7483 cylinder stud M6 x 105
111  $0.20 MU332 washer M6
112  none  N316 base gasket

117  $2.00 UI7496 exhaust stud M6 x 26
152  none   N134/A  flywheel ∅82 ∅110 aluminum Dansi ADP244S
153  none   G314/A  lighting source coil
154  none   G221/2  ignition source coil (with external ground wire that powers brake light)
155  $1.20 G221/7  coil screw M4 x 25 slot
156  $0.40 G221/8  thin lock washer  ∅4 x 7 x 0.5
157  none   SD401  screw set
158  $21.0 CS0004  points #01.3239  photo  (gap 0.015″)

159  $15.0 G221/6  condenser #07.0074  0.28 μf, ∅18 x 21 photo
160  $1.50 G221/3  points screw M4 x 8 small slot
161  none   SD426/3  stator plate bare ∅94  2+3 hole

165  none  G421/C   piston assy Std 44.0 x 17-12-18
165  none  G421/2C piston assy 1os 44.2 x 17-12-18
165  none  G421/4C piston assy 2os 44.4 x 17-12-18
165  none  G421/6C piston assy 3os 44.6 x 17-12-18