View Full Version : GPH with a 1999 yam 4 stroke anybody know

05-24-2009, 08:07 AM
what would be you educated guess on my gph?

running a yam. 9.9 high thrust 4 stroke on a 23' cc parker at trolling speeds 2.0-3.5 mph or so.

05-24-2009, 08:07 AM
sorry double post

05-24-2009, 11:11 AM
Work on 3/4 of a gall per hour

05-25-2009, 11:42 AM
"John, I have a 22ft Seasport with a carbed 2 stroke 200 and a high thrust 9.9. I can run the 200 - 25 minutes to the fishing and 20 minutes back and troll the balance of the 6 hour trip (5hrs) on about 8 gallons of fuel total. I'm know that the 200 uses about 6 gall in the 40 minutes. 2 gallons for the kicker over 5hrs."

11-05-2009, 06:11 PM
"I know this is an old post, but I also have a HT 9.9 on a 22' SeaSport, with a digital fuel flow meter. I get just about 1/2 gal per hr trolling at 3 kts. A 23' Parker CC might do a wee bit better just because the SeaSport has a pretty high profile and gets pushed around if there is any wind."

11-06-2009, 11:12 AM
"Go to: Yamaha Outboard Performance Bulletins for all info regarding your boat/motor GPH, MPG, MPH, etc. Good Luck!"

02-22-2010, 09:42 PM
"Does anyone know how to adjust the shift on a 4 stroke 8 HP? I loaned the motor to an acquaintance, and I think it was shifted while not running. When you go to reverse, it is obviously not fully engaging and makes a grinding sound, but it is still trying to back up. No problem in forward though. Any helpful hints will be appreciated."

02-22-2010, 10:36 PM
"Good to know what the T9.9 burns, I had a 15 hp Honda and I really think it was getting much better GPH than my new T9.9. I run my 225 Honda on a fuel flow gauge but not the T9.9. When I put gas in the last time I put about 5 gallons more than I expected, so the T9.9 accounted for that. I have the old 3 gallon Honda tank, maybe I should run it fishing one day and see if I get 6 hours of trolling time on it.http://www.marineengine.com/discus/clipart/rofl.gif"

02-24-2010, 01:37 AM
Wayne Jeffers

start a new thread

02-24-2010, 03:44 PM
"Talked with a friend last night who also runs a 9.9 Yamaha, he says he runs w/the small tank and can run about 12-15 hours on it, so the .5 GPH seems somewhat on the high side. Just passing on info for the benefit of those who have the 9.9 motors."