NOTE: Muncie – Neptune models having a “U” in their model designation had under water exhausts . Example: OB2AU

Model Name: 1935 OB1 Neptune
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	2/3 pt. SAE-30 per Gal.
Tank
Exhaust
Lower unit
Rope plate	Neptune

Model Name: 1935 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: 1935 OB17 Neptune
Original carburetor	Tillotson MS-45B; Superceeded by MS-47D
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″
Oil	1 pt. SAE-40 per Gal
Tank	Sheet aluminum
Exhaust	Under water
Lower unit	Non stream lined ball bearing
Rope plate	8″ Neptune

Model Name: 1935 OB32 Neptune
Original carburetor	Tillotson MS-45A
Magneto	Eisemann Model 82D
Cylinders	2
B x S	2 1/16” x 1 1/2“
HP	4 @ 3000 RPM
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	8″ Neptune

Model Name: 1935 OB63 Neptune
Original carburetor	Tillotson MS-45A
Magneto	Eisemann Model 82D
Cylinders	2
B x S	2 1/16” x 1 1/2“
HP	6 @ 3400 RPM
Point gap	0.020
Sheer pin	5/32” x 1″
Oil	2/3 pt. SAE-30 per Gal.
Tank	Sheet aluminum
Exhaust	Under water
Lower unit	Ball bearing
Rope plate	6″ Neptune