I will be running my first Yamaha when my new boat arrives in March. Not sure if I was looking at the correct owners manual online, but it had minimum 87 octane for 200HP, and 89 for 225 and 250HP. Can someone verify? thanks
I will be running my first Yamaha when my new boat arrives in March. Not sure if I was looking at the correct owners manual online, but it had minimum 87 octane for 200HP, and 89 for 225 and 250HP. Can someone verify? thanks
Garmin Pro Team
I can tell you my dealer told me only to run 89 octane in my 250SHO, and I believe that 87 is recommended in the 200SHO!
87 for 200 and 89 for 225&250
Those were the octane recomdations on the 2010 Sho as well. I run mostly 91 in my 250 because around here the 91 is a lot less likely to contain ethonal. Larry Brumley
Yes the SHO requires a "minimum" of 89 P.O.N.
P.O.N. = "pump octane number" and is the average of the Research Octane Number (octane determined on an unloaded engine) and Motor Octane Number (octane number determined on a fully loaded engine)
Hence the formula (R+M)/2 = P.O.N.
I don't think any pumps in Texas designate their octane ratings any other way but check at the pump to be sure.
Personally, at this level of investment, I plan to use premium (91-93) to ensure that there is no pre ignition. I also don't trust that the 89 octane is exactly 89 and if it isn't, you are below the requirements of the engine.
It would be interesting to know if four strokes in general are more sensitive to octane ratings than two strokes or is it just a matter of compression ratios.
It's tough waiting for a boat! (I am also)... You think about octane ratings, hitch balls, and other diversions...
I run 92 in mine because around here if you get 89 you will get E10 every time.The engines do have a knock sensor so if you run a lower octane the performance will be decreased.
<table width="90%" cellspacing=0 cellpadding=0 align=center><tr><td>Quote, originally posted by falcooon »</td></tr><tr><td class="quote">
It's tough waiting for a boat! (I am also)... You think about octane ratings, hitch balls, and other diversions...
Yes, exactly falcooon.
Regarding 89 and 91 octane, I was a little concerned regarding the potential of old gas. Maybe it's an incorrect assumption, but with gas prices what they are, I always assumed that stations sold very little higher octane fuel.
Garmin Pro Team
"Regarding 89 and 91 octane, I was a little concerned regarding the potential of old gas. Maybe it's an incorrect assumption, but with gas prices what they are, I always assumed that stations sold very little higher octane fuel."
Another interesting, boat waiting, thought... I found this stat for Texas gasoline consumption for September 2010.
Regular 5,702,000 gallons per day.
Mid grade 426,500 gallons per day.
High test 393,000 gallons per day
http://www.eia.doe.gov/dnav/pe...m.htm
yes that is a regular concern with buying higher grade gas, no telling how long it has been in the tanks and how many if any octane points it may have dropped? it's a gamble!!!
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