PRINCIPAL CHANGES IN THE DIFFERENT TYPES OF "FN 4-CYLINDER MOTORCYCLES from 1905 to 1908"
NOS 15 000 TO 16999 NOS 17 000 TO 19999NOS 20 000 TO 29999
TYPE A 1905TYPE B 1905/6 TYPE C 1905/6 TYPE D 1906TYPE E 1907 TYPE F 1908
Bore: 45mm Same as ASame as B Bore: 48mmSame as DSame as D
New CamsSame as B Same as BSame as BSame as B
Remodelled CarburettorSame as B Same as BSame as B, with independant extra air inlet Same as E
Crank Shaft without ringSame as A Crankshaft with oil retaining ring Same as CSame as C Same as C
Light steel connecting rodsSame as A Reinforced Steel connecting rod Connecting rods without bushes Connecting rods with bronze bushesSame as D
Flywheel with threaded terminalsSame as A Same as ADistributor with split push-on terminals Same as DDistributor with ball terminals
Revolving carbon holder with carbon collector at endSame as A Same as ARevolving carbon holder without carbon collector Same as DSame as B
Simple air-release first modelSame as ASimple air-release(second model) Same as CAir release by vacuum pipeSame as E
Light type of transmissionReinforced type larger cupsSame as B Same as BSame as BSame as B
22" frameSame as ASame as A Same as ASame as A20" frame
2 1/4" rimsSame as ASame as A Same as ASame as A2 1/2" rims
(This table is copied from the parts list of the FN fours from 1913)