1930-1934 Muncie-Neptune Configurations

Model Year Name Tank Cylinders Exhaust Gear case Steering Magneto Carb HP
 OB2 1930-31 Muncie Cast hammered Cast with head Above water Plain bearing Rope steer Bosch MS45A 2.5
 OB2A 1931 Neptune Junior Cast smooth Closed end cylinder Above water Plain bearing Rope steer Bosch MS45A 2.5
 OB2C 1931 Motorgo Sheet metal square Closed end cylinder Above water Plain bearing Tiller small bracket Bosch MS45A 2.5
 OB2CB 1931 Muncie Sheet aluminium Closed end cylinder Above water Ball bearing Tiller small bracket Bosch MS45A 2.5
OB3 1932 Motorgo Sheet aluminium Closed end Above water Plain bearing Tiller Eiseman MS45A 4.0
OB3A 1932 Neptune Junior Sheet aluminium Closed end Above water Plain bearing Tiller Eiseman MS45A 4.0
OB4 1933 Motorgo Cast Removable heads Under water Ball bearing Tiller Eiseman MS45A or MS45B 4.0
OB4A 1931-1932 Neptune Junior Sheet aluminium Closed end Under water Ball bearing Tiller Bosch MS45A or MS45B 6.0
OB4B 1932 Muncie Sheet aluminium Removable heads Above water Ball bearing Tiller Eiseman MS45A or MS45B 4.0
OB5 1934 Motorgo “5” Embossed aluminium Removable heads Under water Ball bearing Tiller Eiseman MS45B 4.0
OB5A 1932 Improved Neptune Sheet aluminium Removable heads Under water Ball bearing Tiller Eiseman MS45B 6.0
OB51 1932 Waterwitch Sheet aluminium Removable heads Under water Ball bearing Tiller 4.0