Engine Specs. for FH721V    

90°V,
twin overhead V-Valve, 
Pressurised Lubrication,
Oil Filter,
Electronic ignition,
Auto Decompression,
Dual Element
Air Filter,
Cast Iron Cylinder Liners,
No  Muffler,
No fuel tank.
Twin barrel internally,
Vented Carb with fuel shutoff solenoid.
18.6kW, 
1 1/8" Shaft.  P/N ENG6354

1 1/8" Shaft.
 Cannister Air Filter for ZTR. 
P/N ENG6355

1 " Shaft.  Cannister Air Filter for ZTR. P/N ENG6451