Designed by Steve Andres
NOTE: Muncie – Neptune models having a “U” in their model designation had under water exhausts . Example: OB2AU
| Model Name: 1934 OB1 Waterwitch |
| Original carburetor |
Tillotson MS-73A |
| Magneto |
Eisemann Model 71H |
| Cylinders |
1 |
| B x S |
2 1/16” x 1 1/2“ |
| HP |
2 |
| Point gap |
0.020 |
| Sheer pin |
5/32” x 1″ |
| Oil |
1/2 pt SAE 30 per gallon |
| Tank |
|
| Exhaust |
Under water |
| Lower unit |
|
| Rope plate |
Waterwitch |
| Model Name: 1934 OB15 Motorgo |
| Original carburetor |
Tillotson MS-47A |
| Magneto |
Eisemann Model 82D |
| Cylinders |
2 |
| B x S |
2 1/2” x 2″ |
| HP |
16 |
| Point gap |
0.020 |
| Sheer pin |
7/32” x 1 1/2“ |
| Oil |
2/3 pt SAE40 per gal. |
| Tank |
Sheet aluminum |
| Exhaust |
Under water |
| Lower unit |
Non stream lined ball bearing |
| Rope plate |
Motorgo |
| Model Name: 1934 OB15A Master |
| Original carburetor |
Tillotson MS47A |
| Magneto |
Eisemann Model 82D |
| Cylinders |
2 |
| B x S |
2 1/2” x 2″ |
| HP |
16 @ 4000 RPM |
| Point gap |
0.020 |
| Sheer pin |
7/32” x 1 1/2“ |
| Oil |
3/4 pint to gallon |
| Tank |
Sheet aluminum |
| Exhaust |
Under water |
| Lower unit |
Stream lined early |
| Rope plate |
8″ Neptune |
| Model Name: 1934 OB15B Master |
| Original carburetor |
Tillotson MS-47A |
| Magneto |
Eisemann Model 82D |
| Cylinders |
2 |
| B x S |
2 1/2” x 2″ |
| HP |
16 |
| Point gap |
0.020 |
| Sheer pin |
7/32” x 1 1/2“ |
| Oil |
3/4 pint to gallon |
| Tank |
Sheet aluminum |
| Exhaust |
Under water |
| Lower unit |
Stream lined early |
| Rope plate |
8″ Muncie Master |
| Model Name: 1934 OB15G Sea Gull |
| Original carburetor |
Tillotson MS-47B |
| Magneto |
Eisemann Model 82D |
| Cylinders |
2 |
| B x S |
2 1/2” x 2″ |
| HP |
16 @ 4000 RPM |
| Point gap |
0.020 |
| Sheer pin |
7/32” x 1 1/2“ |
| Oil |
2/3 pt SAE 40 per gal. |
| Tank |
Sheet aluminum |
| Exhaust |
Under water |
| Lower unit |
Later non stream lined |
| Rope plate |
8″ Seagull |
| Model Name: 1934 OB16 |
| Original carburetor |
Tillotson MS-47A |
| Magneto |
Eisemann Model 82D |
| Cylinders |
2 |
| B x S |
|
| HP |
16 |
| Point gap |
0.020 |
| Sheer pin |
|
| Oil |
|
| Tank |
|
| Exhaust |
|
| Lower unit |
|
| Rope plate |
|
| Model Name: 1934 OB1A Neptune Single |
| Original carburetor |
Tillotson MS-73A |
| Magneto |
Eisemann Model 71H |
| Cylinders |
1 |
| B x S |
2 1/16” x 1 1/2“ |
| HP |
2 |
| Point gap |
0.020 |
| Sheer pin |
5/32” x 1″ |
| Oil |
1/2 pt SAE 30 per gallon |
| Tank |
|
| Exhaust |
Under water |
| Lower unit |
|
| Rope plate |
Neptune |
| Model Name: 1934 OB31 Waterwitch |
| Original carburetor |
Tillotson MS-45A |
| Magneto |
Eisemann Model 82D |
| Cylinders |
2 |
| B x S |
2″ x 1 1/2“ |
| HP |
4 |
| Point gap |
0.020 |
| Sheer pin |
5/32” x 3/4” or 3/16” x 3/4“ |
| Oil |
2/3 pt. SAE-30 per Gal. |
| Tank |
Cast aluminum smooth |
| Exhaust |
Above water |
| Lower unit |
Plain bearing |
| Rope plate |
6″ sand cast Neptune or Waterwitch |
| Model Name: 1934 OB31A Junior Neptune |
| Original carburetor |
Tillotson MS-45A |
| Magneto |
Eisemann Model 82D |
| Cylinders |
2 |
| B x S |
2″ x 1 1/2“ |
| HP |
4 |
| Point gap |
0.020 |
| Sheer pin |
5/32” x 3/4” or 3/16” x 3/4“ |
| Oil |
2/3 pt. SAE-30 per Gal. |
| Tank |
Cast aluminum smooth |
| Exhaust |
Above water |
| Lower unit |
Plain bearing |
| Rope plate |
6″ sand cast Neptune |
| Model Name: 1934 OB5 Motorgo ‘5’ |
| Original carburetor |
Tillotson MS-45A; Superceeded by MS-45D |
| Magneto |
Bosch FY6FD or Eisemann 82D |
| Cylinders |
2 |
| B x S |
2″ x 1 1/2“ |
| HP |
5 |
| Point gap |
0.020 |
| Sheer pin |
5/32” x 3/4” or 3/16” x 3/4“ |
| Oil |
2/3 pt. SAE-30 per Gal. |
| Tank |
Sheet metal |
| Exhaust |
Under water |
| Lower unit |
Ball bearing |
| Rope plate |
6″ Motorgo |
| Model Name: 1934 OB51 Improved Twin |
| Original carburetor |
Tillotson MS-45A; Superceeded by MS-45D |
| Magneto |
Eisemann Model 82D |
| Cylinders |
2 |
| B x S |
2″ x 1 1/2“ |
| HP |
5 |
| Point gap |
0.020 |
| Sheer pin |
5/32” x 3/4” or 3/16” x 3/4“ |
| Oil |
2/3 pt. SAE-30 per Gal. |
| Tank |
Smaller sheet aluminum |
| Exhaust |
Ball bearing |
| Lower unit |
Under water |
| Rope plate |
6″ sand cast Neptune |
| Model Name: 1934 OB5U Motorgo ‘5’ |
| Original carburetor |
Tillotson MS-45A; Superceeded by MS-45D |
| Magneto |
Bosch FY6FD or Eisemann 82D |
| Cylinders |
2 |
| B x S |
2″ x 1 1/2“ |
| HP |
5 |
| Point gap |
0.020 |
| Sheer pin |
5/32” x 3/4” or 3/16” x 3/4“ |
| Oil |
2/3 pt. SAE-30 per Gal. |
| Tank |
Sheet metal |
| Exhaust |
Under water |
| Lower unit |
Ball bearing |
| Rope plate |
6″ Motorgo |
| Model Name: 1934 OB61 Improved Twin |
| Original carburetor |
Tillotson MS-45A |
| Magneto |
Eisemann Model 82D |
| Cylinders |
2 |
| B x S |
2″ 1/2” x 2″ |
| HP |
6 |
| Point gap |
0.020 |
| Sheer pin |
5/32” x 1″ |
| Oil |
2/3 pt SAE 30 per gallon |
| Tank |
Sheet aluminum |
| Exhaust |
Under water |
| Lower unit |
Ball bearing |
| Rope plate |
Water Witch |
| Model Name: 1934 OB61A Improved Twin |
| Original carburetor |
Tillotson MS-45A |
| Magneto |
Eisemann Model 82D |
| Cylinders |
2 |
| B x S |
2″ x 1 1/2“ |
| HP |
6 |
| Point gap |
0.020 |
| Sheer pin |
5/32” x 3/4” or 3/16” x 3/4“ |
| Oil |
2/3 pt. SAE-30 per Gal. |
| Tank |
Sheet Aluminum |
| Exhaust |
Under water |
| Lower unit |
Ball bearing |
| Rope plate |
8″ Neptune |
