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Yamaha runs rough during "transition"
zappaddles	#21  Posted on 05/08/13 - 5:36 AM
Member Posts: 478 Comments: 2 Joined: 06/03/10	Didn't realize that falling off plane is common to the 15s. Makes feel a bit better about my set-up. As much as I dislike to look of the foils I did install one. It didn't seem to help much at all. Zap If you can't play hurt....stay home.
huckelberry145	#22  Posted on 05/08/13 - 12:11 PM
Member Posts: 401 Comments: 3 Joined: 03/10/12	I don't think my 15' falls of plane easily. I can't remember what the lowest speed is but i know that my boat will stay on plane at 20 mph, probably less because it didn't seem to work the motor that much. I also have a prop with less cup, a 13.125x 17 Turbo and a hydrafoil. I don't like the look of them either but what could I do. I tried that same brand/ size prop that you have and didn't experience any "bogging" that you describe. I understand that stiletto puts holes in the back of the prop so it will vent exhaust and slip, keeping the rpms up through the transition phase. Is not the transition phase the time where fuel consumption will be the greatest? Could it be a fuel pump or filter going bad? Could the spark not be hot enough? Owning a 15' with a 70 Yamaha myself, I'm very curious of the outcome of this.
CES	#23  Posted on 05/08/13 - 1:18 PM
Member Personal Page Photo Albums Project Albums Posts: 2681 Comments: 7 Joined: 04/27/07	zappaddles wrote: Didn't realize that falling off plane is common to the 15s. Makes feel a bit better about my set-up. As much as I dislike to look of the foils I did install one. It didn't seem to help much at all. Zap I've never recommended a foil..... however "Smart tabs" might be your ticket.... Cliff 1966 13' Sport with a 1993 40hp Yamaha 2 Smoker
tedious	#24  Posted on 05/08/13 - 1:59 PM
Member Personal Page Posts: 1072 Comments: 2 Joined: 09/07/08	Huck, since you have the same setup, yours would be a great comparison. What happens if you try to run in the range Zap has trouble with (1600-2200 RPM)? I mean stay at those speeds, not just pass through them on your way to planing. Tim
huckelberry145	#25  Posted on 05/08/13 - 6:46 PM
Member Posts: 401 Comments: 3 Joined: 03/10/12	tedious wrote: Huck, since you have the same setup, yours would be a great comparison. What happens if you try to run in the range Zap has trouble with (1600-2200 RPM)? I mean stay at those speeds, not just pass through them on your way to planing. Tim I sure will. So long as I can do some fishing between tests;-)
huckelberry145	#26  Posted on 05/10/13 - 6:38 PM
Member Posts: 401 Comments: 3 Joined: 03/10/12	Zap, I went fishing today and tried to replicate the conditions you say makes your motor run rough. I slowly throttled up and plowed until the boat planed off. Through it all it ran smooth. Even when I had the same prop you have, I don't remember it doing what you describe.
zappaddles	#27  Posted on 08/08/13 - 5:04 AM
Member Posts: 478 Comments: 2 Joined: 06/03/10	Most of the roughness during transition was due to improper settings on the carburetors. Upon visual inspection of the linkage the mechanic who diagnosed and corrected the problem said "They (the settings) look close. But close don't get it". If you can't play hurt....stay home.