2005 Four Stroke Series Portable Specifications


F25hp

F15hp

F9.9hp

F8hp

F6hp

F4hp

Engine Type 2 cyl. 2 cyl. 2 Cyl. 2 Cyl. 2 cyl. 1 cyl.
Displacement 30.3 ci (498 cc) 19.7 ci (323 cc) 19.7 ci (323 cc) 12.0 ci (197 cc) 12.0 ci (197 cc) 6.7 ci (112 cc)
RPM Range 5000-6000 4500-5500 4500-5500 5000-6000 4500-5500 4000-5000
Alternator Output @ W.O.T. 15A 10A - 6A 10A *** *** *** N.A.
Compression Ratio 9.87:1 9.19:1 9.19:1 8.79:1 8.79:1 8.4:1
Induction System SOHC SOHC SOHC SOHC SOHC OHV
Lubrication Wet Sump Wet Sump Wet Sump Wet Sump Wet Sump Splash
Ignition System CDI Micro Computer CDI CDI CDI Micro Computer CDI Micro Computer TCI
Starting System Manual or Electric Manual or Electric Manual or Electric Manual Manual Manual
Shaft Length 15 in., 20 in. 15 in., 20 in. 15 in., 20 in. 15 in., 20 in. 15 in., 20 in. 15 in., 20 in.
Gear Ratio 13:27 (2.08) 13:27 (2.08) 13:27 (2.08) 13:27 (2.08) 13:27 (2.08) 13:27 (2.08)
Weight* 136 lb (62 kg) 99 lb (45 kg) 99 lb (45 kg) 83 lb (38 kg) 83 lb (38 kg) 48 lb (22 kg)
Warranty 3 Year Limited Pleasure Boat - 1 Year Limited Commercial 3 Year Limited Pleasure Boat - 1 Year Limited Commercial 3 Year Limited Pleasure Boat - 1 Year Limited Commercial 3 Year Limited Pleasure Boat - 1 Year Limited Commercial 3 Year Limited Pleasure Boat - 1 Year Limited Commercial 3 Year Limited Pleasure Boat - 1 Year Limited Commercial

* Weight refers to shortest shaft length available. @Weight includes propeller where standard
   (2-30 hp); does not include propeller where optional props are available (40-250 hp).
** 3 hp through 30 hp comes standard with an aluminum propeller. 2 hp comes standard with a
      plastic propeller.
*** Consult your dealer for optional equipment.

Due to Yamaha's ongoing commitment to product improvement, we reserve the right to change without notice, equipment, materials or specifications. Your Yamaha Dealer is the best source for up-to-date product information. Read and follow the operation and maintenance guidelines provided by Yamaha in your Owner's Manual. Always observe all applicable boating laws. Never drink and drive. Dress properly with a USCG-approved personal flotation device and protective gear.