Flat Reed Engine ’85-89
Two engine versions are in this group:
1. F flat-reed ’85-86 SLE-X, ’87-89 Variant Sport .
silver all-aluminum cylinder with ∅7 stud holes
2. Fe flat-reed ’86-89 Derbi DS50 .
silver all-aluminum cylinder with ∅7 stud holes
retractable left pedal, CDI ignition, electric start
Sources
MMI is Marina Mobili Inc
1. 1987 Parts List Variant x National Motor
2. 1987 Parts List DS50 xxx MMI
3. 1989 Price List xxxxxxxx MMI
B1. Cylinder, Piston, Crank
# qty 00 Derbi # 00 price new or good-used .
1 1 0F0.50.00.121 none cylinder-piston
2 4 000.82.00.730 $4.00 head nut M7 x 10 hex12
3 4 000.31.25.280 $0.20 head washer ∅7
4 1 0F0.50.00.171 $45.0 head bare
5 1 0F0.25.00.021 none head gasket
6 2 0F0.25.00.041 $4.00 base gasket
7 2 0F0.25.00.111 $10.0 piston ring 40 x 1.5 GI
8 1 0F0.25.00.091 none piston
9 1 000.31.25.120 $10.0 piston pin ∅12 x 30
10 2 000.31.25.130 $1.50 piston clip ∅12
11 1 0F0.50.00.011 none rod assy
12 1 000.21.25.170 $9.00 piston bearing 12-15 x 15
13 1 005.90.20.400 none R crank bearing 6204 C4
13 1 005.90.20.400 $12.0 R crank bearing 6204
14 1 005.91.20.300 none L crank bearing 6203 C4
14 1 005.91.20.300 $12.0 L crank bearing 6203 C3
15 1 0F0.25.00.141 none crankshaft
16 1 000.31.25.180 none rod bearing
17 1 0F0.25.00.191 none crank pin
18 2 0F0.25.00.231 $8.00 L & R crank seal 17-30-7
B2. Variator Clutch
# qty 00 Derbi # 00 price new or good-used .
1 1 000.00.00.000 none 0
2 1 000.00.00.000 none 0
3 1 000.00.00.000 none 0
4 1 000.00.00.000 none 0
5 1 000.00.00.000 none 0
6 1 000.00.00.000 none 0
7 1 000.00.00.000 none 0
8 1 000.00.00.000 none 0
9 1 000.00.00.000 none 0
10 1 000.00.00.000 none 0
11 1 000.00.00.000 none 0
12 1 000.00.00.000 none 0
13 1 000.00.00.000 none 0
14 1 000.00.00.000 none 0
15 1 000.00.00.000 none 0
16 1 000.00.00.000 none 0
17 1 000.00.00.000 none 0
18 1 000.00.00.000 none 0
19 1 000.00.00.000 none 0
20 1 000.00.00.000 none 0
21 1 000.00.00.000 none 0
22 1 000.00.00.000 none 0
23 1 000.00.00.000 none 0
24 1 000.00.00.000 none 0
25 1 000.00.00.000 none 0
26 1 000.00.00.000 none 0
27 1 000.00.00.000 none 0
28 1 000.00.00.000 none 0
29 1 000.00.00.000 none 0
30 1 000.00.00.000 none 0
31 1 000.00.00.000 none 0
32 1 000.00.00.000 none 0
B3. Case and Covers
# qty 00 Derbi # 00 price new or good-used .
1 1 0F0.30.20.631 none case set
2 1 0A0.30.10.021 none dowel tube
3 1 0F0.30.00.151 none right cover
4 1 0F0.30.00.201 none left cover
5 1 0F0.30.00.031 $13.0 case gasket
6 4 0F0.30.00.051 none cylinder stud M7 x ??
7 2 0F0.22.10.711 none silent block ∅10-?? x ??
8 1 0F0.30.10.071 none spacer tube ∅10-?? x ??
9 1 000.40.11.600 none fill plug M10-1.50 x 16 allen
10 1 0A0.30.00.121 $2.00 fill-drain seal washer ∅10-14
11 3 000.00.02.650 $1.00 L cover bolt M6 x 50 allen
11 x 000.00.02.650 $1.00 case bolt M6 x 50 allen
12 3 000.00.02.670 $1.20 mount bolt M6 x 70 hex
13 3 0M0.30.00.771 $0.30 mount nut M6
14 4 000.00.04.630 $0.80 R cover bolt M6 x 30 allen
15 1 000.00.04.610 $3.00 check plug M6 x 10 allen
16 1 000.31.02.280 $0.70 bolt M6 x 20 allen
26 4 000.00.33.060 $0.25 lock washer ∅6
28 1 0F0.25.00.581 $7.00 carb sleeve ∅18 x 20
# qty 00 Derbi # 00 price DS50 Case Parts
1 1 0F0.30.30.631 none case set
2 1 0F0.30.00.151 none right cover
3 2 0F0.22.10.711 none silent block ∅10-?? x ??
4 1 0F0.30.00.031 $13.0 case gasket
5 4 0F0.30.00.051 none cylinder stud M7 x ??
6 1 0F0.30.10.241 none sprocket cover
7 1 0F0.30.10.071 none spacer tube ∅10-?? x ??
8 2 0A0.30.10.021 none dowel tube
9 1 000.00.02.670 $1.20 mount bolt M6 x 70 hex
10 2 000.00.02.670 $1.20 mount bolt M6 x 70 hex
11 3 0M0.30.00.771 $0.30 mount nut M6
12 4 000.00.04.630 $0.80 R cover bolt M6 x 30 allen
12 x 000.00.02.650 $1.00 case bolt M6 x 50 allen
13 1 000.00.04.610 $3.00 check plug M6 x 10 allen
14 1 000.31.02.280 $2.00 fill-drain seal washer ∅10-14
17 1 0A0.30.00.421 none drain plug M10-?? allen w/magnet
18 1 0F0.25.00.641 none reed valve assy 2-petal flat
19 2 000.00.33.030 $1.00 lock washer ∅3
20 2 001.20.30.800 $1.00 screw M3 x 8
21 1 0F0.25.00.631 none reed valve stop
22 1 0F0.25.00.651 none reed petal
23 1 0F0.25.00.711 $45.0 intake pipe ∅??-18
24 2 0F0.25.00.811 $5.00 reed valve gasket
25 4 000.00.04.620 $0.70 bolt M6 x 20 allen
26 4 000.00.33.060 $0.25 lock washer ∅6
27 1 0F0.25.00.581 $7.00 carb sleeve ∅18 x 20
28 1 0E0.29.20.381 none rubber bumper
29 1 000.00.47.125 none external circlip
30 1 0F0.35.10.711 none bushing
31 1 0F0.35.00.731 none spring guide
32 1 0F0.35.00.721 none spring
33 1 0E0.29.10.551 none bushing
34 1 0F0.35.00.781 none spring bearer
35 1 0F0.35.10.821 none spring
36 1 000.25.02.615 none bolt M6 x 15
37 1 000.00.21.060 none nut M6
38 1 000.00.31.060 none washer ∅6
39 1 0F0.30.20.201 none starter housing
40 1 000.00.04.510 none bolt M5 x 10
41 4 000.00.04.635 none bolt M6 x 35 allen
42 1 000.31.30.020 none dowel pin
43 1 0F0.35.00.841 none bushing
B4. Pedal Transmission
# qty 00 Derbi # 00 price new or good-used .
# qty 00 Derbi # 00 price DS50 Pedal Trans.
B5. Motor Transmission
# qty 00 Derbi # 00 price new or good-used .
B6. Exhaust
# qty 00 Derbi # 00 price new or good-used .
1 1 000.00.00.000 none 0
2 1 000.00.00.000 none 0
3 1 000.00.00.000 none 0
4 1 000.00.00.000 none 0
5 1 000.00.00.000 none 0
11 1 000.00.00.000 none 0
12 1 000.00.00.000 none 0
13 1 000.00.00.000 none 0
21 1 000.00.00.000 none 0
22 1 000.00.00.000 none 0
23 1 000.00.00.000 none 0
24 1 000.00.00.000 none 0
25 1 000.00.00.000 none 0
26 1 000.00.00.000 none 0
26 1 000.00.00.000 none 0
28 1 000.00.00.000 none 0
29 1 000.00.00.000 none 0
B7. Carburetor: link to Engine Parts A8
B8. Magneto: link to Engine Parts A6
# qty 00 Derbi # 00 price DS50 Magneto
1 1 0F0.33.50.011 none magneto assy ’86-91 DS50
2 1 000.31.33.230 $2.00 flywheel key M82 2.5 x 3.7
3 1 0D0.33.00.271 none spark plug cap w/resistor
4 1 000.52.33.210 $4.00 spark plug NGK B7HS
5 1 0E0.33.10.171 none spark coil
6 1 0F0.26.00.401 $12.0 nut M10-1 LEFT x 8 hex14
7 3 000.31.33.260 $2.00 stator screw M5 x 10 orig.
7 3 000.31.33.260 $0.60 stator screw M5 x 10 subst.
8 1 0M0.26.00.651 $2.00 flywheel washer ∅10-19 x 1
23 1 0F0.33.00.701 none source coil assy
24 1 0F0.33.30.121 none flywheel
25 1 003.60.00.400 none lock washer ∅4
26 1 000.30.42.500 none coil screw
27 1 0F0.33.00.021 none stator plate bare
# qty 00 Derbi # 00 price DS50 Elec. Start