Engine information on popular Toro Models

Toro 12-32XL

Original Model: Briggs 12.5HP 282707-0119

Toro 12-38XL

Original Model: Briggs 12.5HP 286707-0453

Toro 13-38HXL

Original Model: Briggs 13HP 28M707-0122

Toro 14-38HXL

Original Model: Briggs 14.5HP 28N707-0131

Toro 15-38HXL

Original Model: Briggs 15HP 280777-0690

Toro 16-38HXL
Original Model: Briggs 28Q777-0690-E1
Toro 1742Z
Original Model: Briggs 17HP 31F777-0162
Toro 17-44HXL
Original Model: Briggs 312777-0128
Toro Z149
Original Model: Kawasaki FH601V-CS06
Toro Z16-42
Original Model: Briggs 16hp 286H77 or a 311777-0117
This mower has an electric clutch on it.
Toro Z16-44
Original Model: Briggs 31G777-0036
Some of these mowers had a 311777 engine. 
Toro Z252
Original Model: Kohler Command CH25-68543
Toro Z253
Original Model: Kohler Command CH23
Toro Z255
Original Model: Kohler Command CH25
Toro Z325
Original Model: Kohler Command CH25-68610 or 68576
Toro Z42
Original Model: SV590-0019
Toro Z420
Original Model: 16 HP Briggs 286h77-0165
Toro Z4200
Original Model: 19hp Kohler Courage SV590-0019
1" x 3-5/32" Shaft, Fuel Pump, 15 Amp Alternator.
Toro Z5000
Original Model: 21hp Kohler Courage SV610-0020
This engine has a 1"x 3-5/32" shaft, Fuel Pump, and 15 Amp Alternator.