On the frame behind the headlight is the ID plate. The lower squares say model (left) and speed version (right), stamped in. Before 1980, A=30, B=25, C=20. From 1980 on, A=20, B=25, C=30. Before 1978, no letter, just 20, 25, or 30 (mph). Hope yours is a 30! 1980 was the last year for US models. 1981 had new 17 digit VIN and new EPA and DOT noise and safety regulations. That was “the last straw”.
Welcome. Myron’s Mopeds carries Motobecane moped parts, for 1970′s US models. Motobecane has made many other models, a model line, and millions sold, for every major country in Europe and on most of the Earth. The quantity of 1970′s USA mopeds is less than 10% of all Motobecanes world wide since the 1920′s. All of the US models use the “Moby” engine, aka “AV7″, piston port, two transfers, rubber mounted. Motobecanes from earlier or later times or from other countries, are not included here.
Motobecane began in 1922 as two French engineers, Charles Benoit and Abel Bardin. They made the name from “moto” French slang for motorcycle, and “bécane” French slang for bicycle. In the 1950′s, Motobecane pioneered the dual action clutch system, where one clutch makes the engine start when the rear wheel speed becomes fast enough, and the other clutch makes the bike move forward when the engine speed becomes high enough. They called this dual system “Dimoby”. It means “one speed dual auto clutch”. What’s confusing is the variator models (two speed, dual auto clutch) were not called Dimoby. Motobecane has a division called Motoconfort. That name appears on some of the original parts and packaging. It is easy to confuse “comfort” and “con fort” (with force). Remember Motobecanes have strength, not comfort!
The Gurtner “AR2″ series carburetors are slightly larger than a pack of cigarettes. There are two sizes, 10 or 12mm, and two styles, side or center mount. On the older style center mounted carbs, with short intakes, the choke cable is top pull. The carb is not trapped. On newer (after March 1977) side mount (for easier access) carburetors with swinging engines (variators), the choke cable is bottom pull. The choke wire runs through the carb, trapping it on the bike. Most service operations are done with cables attached. If you pull the choke wire all the way out, it won’t usually go back because the braided end gets frayed.location “A or B” carb ID # size clamp applications part #s ======================================================================= center mount A AR212/R705 12mm 17mm pre-03/1977 30mph variator, short intake 20026=carb 53657=body center mount A AR210/R991 10mm 16mm 25mph variator, short intake 52175=carb 52430=body side mount B AR212/R873 12mm 19mm post-03/1977 30mph variator, long intake 54973=carb 54466=body side mount B AR212/R729 12mm 19mm 25 & 30 Dimoby, long intake 22160=carb 54466=body side mount B AR210/R910 10mm 19mm 20mph Dimoby, long intake 54115=carb 54235=body center mount AR1-12-884 12mm 19mm Model 7 (not shown) 20,25,30 Dimoby 23021=carb ============================================================================== Key: A = center mount carb only B = side mount carb only 1A 53657 Ø12 carb bare ??? for AR212/R705 1A 52430 Ø10 carb bare ??? for AR210/R991 1B 54466 Ø12 carb bare ??? for AR212/R873 & 729 1B 54235 Ø10 carb bare ??? for AR210/R910 2A 18355 air filter cover ??? for center mount 2B 20949 air filter cover N/A for side mount 3A 15041 air filter screen ??? for center mount 3B 20999 air filter screen ??? for side mount 4A 18356 spring clip ??? for center mount 4B M6cup cupped washer $4 Myrons upgrade 5B M5lock M5 nylock nut $1 Myrons upgrade 5B M6lock M6 nylock nut $1 Myrons upgrade 6B 21000 stud 5mm ??? until 1978 6B 23562 stud 6mm ??? 1978-later 7B 20997 air filter gasket ??? for side mount 8B 20996 air filter ??? for side mount 9 19689 threaded plug $2 M3 x ? taper seal 10 19767 bolt $2 M6 x 1 x ? w/flange 11 15326 gasket $1 5mm paper washer 12 20475 sealing ring $8 thick rubber o-ring 13A 00189 cable adjuster A10 for center mount 13B 21940 cable guide $12 for side mount 14 18893 screw $1 with washer 15 01271 washer $1 with screw 16A 21229 slide cap $4 recessed for elbow 16B 21696 slide cap N/A threaded for adjuster 17 14107 throttle spring $7 18 15319 throttle slide ??? for 10mm carbs 18 19278 throttle slide ??? for 12mm carbs 19 14120 choke spring $10 19B 22935 choke ring $2 20 14119 choke slide $18 21 00204 idle spring $2 22 18892 idle speed screw $2 23 00208 bolt assy $5 24 00878 nut $3 25 15043 mount clamp $3 26A 14100 mount sleeve ??? 19×16 black (Ø10) 26A 16630 mount sleeve ??? 19×17 white (Ø12) 26B 22689 mount gasket ??? 27 18880 float gasket ??? 28 14133 fuel filter ??? 29 14101 float ??? 30A 52560 diffuser ??? 30A 19990 diffuser ??? 30B 20573 diffuser ??? 30B 54237 diffuser ??? 30B 21002 diffuser ??? 31 20000 diffuser cap ??? 32 21841 fuel jet 210=52 ??? 23545 fuel jet 210=52 ??? for 20mph Dimoby 54214 fuel jet 52=210 ??? 32 21843 fuel jet 220=54 ??? 23546 fuel jet 220=54 ??? optional size 32 21842 fuel jet 225=55 ??? optional size 32 21949 fuel jet 230=56 ??? 23547 fuel jet 230=56 ??? for 25&30 Dimoby+ 32 20216 fuel jet 235=57 ??? optional size 32 23548 fuel jet 240=58 ??? optional size 22938 fuel jet 240=58 ??? 32 20627 fuel jet 245=59 ??? optional size 32 xxxxx fuel jet 250=60 ??? optional size 32 20628 fuel jet 255=61 ??? optional size 34A xxxxx float cover none ??? no fuel inlet 34B 22161 float cover vert ??? vertical inlet 35B 21228 float cover hor. ??? horizontal
Motobecane Decompression Valve:
Motobecane Cables are all single-ended, with a screw-on pinch bolt at one end. So the inner wire can slide out and be replaced separately. Motobecane controls and Gurtner carburetor choke parts are not like any other moped, so those cable related things are unique to Motobecane. When there are are “universal” substitutes, they are listed below, with links to Parts By Type/Cables. Just remember the item number to scroll to, like P2c or W1.1 20533 rear brake cable 56×63″ silver $15 1 rear brake cable 56×63″ black $15 use rear brake cable 62×69″ black C2
2 15581 step ferrule 6-to-8mm F1
3 00716 6 x 11mm pinch bolt P2a 4 15600 rear brake wire 63″, use 69″ W1
5 20532 front brake cable 31×38″ silver $15 5 23856 front brake cable 31×38″ black $15 use front brake cable 39×48″ black C1
6 15599 univ front brake wire 48″ W3
7 16944 step ferrule 4-to-7mm F2
8 15578 decomp. cable 29×36″ silver $17 8 decomp. cable 29×36″ black $17
9 14974 decomp. wire 36″ (32″ min) $7 use univ decomp wire 48″ W4
10 choke cable 37×44″ silver $15 use univ throttle cable 37×47″ black C3 10a choke cable 42×47″ silver $15 10a choke cable 42×47″ black $15 11 21286 choke/throttle wire 47″ W2 12 throttle cable 37×44″ silver $15 use univ throttle cable 37×47″ black C3 12a 53419 throttle cable 35×44″ silver $15 12a throttle cable 35×44″ black $15 use univ throttle cable 37×47″ black C3 A 21222 brake cable adjuster original $3-$5 use adjuster 6mm x 1.0 A2 or A3 B 20059 cable guide and fender bolt $8 C 14322 choke pinch bolt 12mm long $6 D 20053 choke step spacer 3mm long $8 E 23123 decomp pinch bolt 17mm long $5 F 23122 decomp step spacer 8mm long $5 G 00189 adjuster 6mm x 0.8 fine A10 H 21940 cable elbow see 13b-carb I 23089 adjuster 5mm x 0.9 coarse A1c J 14120 choke spring see 19-carb K 14119 choke slide see 20-carb L 22936 choke cable guide see 20b-carb use M6x1.0 adjuster A2 or shorter M 22935 choke cable ring see 19b-carb use washer or step ferrule 4-to-7mm F2 N adjuster 7mm x 1 short A12 O 23114 throttle sliding block see controls
Cable lengths are for original handlebars. Low or narrow bars need shorter cables. Tall or wider bars need longer cables. Motobecane original cables are nylon lined. Most models are silver cables, that get sunburned brown where they are not covered by the grey sheath. Even though they look bad, they still function. The sheath becomes brittle with age. When that happens, it breaks in certain places. Then the cables get flexed only in certain places. So new cables in old brittle sheaths is not a good idea. It’s better to remove the brittle sheaths, or buy new flexible wire or cable sheaths/covers from some electronics stores. When the sheath is flexible, the whole cable flexes gently. It performs better and lasts longer. Always lube cables with a drip oil can, or buy a small bottle of cable lube. Often cables and throttles resist moving, and at first seem bad, but become freer after oil gets inside them.
More Motobecane parts being organized …
These were made from the late 1950′s to the mid 1960′s by Motobecane in France, for Montgomery Wards department stores throughtout the USA. You could order one from their catalog. They were models AV78 and AV88.