Model J Engines
First series of 4 cycle engines built starting in 1911. In 1911 there were 3 sizes available in the Junior line 1 1/2 , 4hp, and Big 6. Early 1912 ads in the 1 3/4, 2 1/2, 8, & 12. Late 1912 is the first time seeing the engines getting special names and some horse powers changed as well. I'm only guessing these engines were possibly produced up to 1916.
1 1/4 HP "JUNIOR", "PUmping and Dairy special", "Jewel"
Most people call these engines 1hp engines. When first introduced they were rated at 1 1/2hp then demoted to 1 1/4 late 1912
3" Bore x 3 1/2" Stroke
400-600 RPM 1911
200-600 RPM 1912 on
Flywheel diameter 15 5/8" 1911-late 1912
Flywheel diameter 15 3/4" late 1912 on
315 lbs shipping weight 1911-early 1912
240 lbs shipping weight late 1912
1 3/4 HP "Standby"
3 1/2" Bore x 5" Stroke
200-600 RPM
Flywheel diameter 17 1/2" early 1912
Flywheel diameter 16 1/2" late 1912
Flywheel diameter 17" 1913
375 lbs shipping weight early 1912
275 lbs shipping weight late 1912
235 lbs shipping weight 1913
2 1/2 hp " Popular"
4 1/4" Bore x 5 1/2" Stroke
200-600 RPM
Flywheel diameter 22" early 1912
Flywheel diameter 20" late 1912
450 lbs shipping weight 1912
4 HP "Leader"
4 3/4" Bore x 6" Stroke
350-600 RPM 1911
200-500 RPM late 1912 on
Flywheel diameter 25" 1911
Flywheel diameter 26" early 1912
Flywheel diameter 25 1/2" 1913
800 lbs shipping weight
6 hp "Big six"
6" Bore x 8" Stroke
325-550 RPM 1911
280-450 RPM early 1912
380 RPM late 1912 on
Flywheel diameter 34" all
1200 lbs shipping weight