Guests - If You want access to member only forums on HSO. You will gain access only when you Sign-in or Sign-Up on HotSpotOutdoors.

It's easy - LOOK UPPER right menu.

  • Announcements

    • Rick

      Members Only Fluid Forum View   08/08/2017

      Fluid forum view allows members only to get right to the meat of this community; the topics. You can toggle between your preferred forum view just below to the left on the main forum entrance. You will see three icons. Try them out and see what you prefer.   Fluid view allows you, if you are a signed up member, to see the newest topic posts in either all forums (select none or all) or in just your favorite forums (select the ones you want to see when you come to Fishing Minnesota). It keeps and in real time with respect to Topic posts and lets YOU SELECT YOUR FAVORITE FORUMS. It can make things fun and easy. This is especially true for less experienced visitors raised on social media. If you, as a members want more specific topics, you can even select a single forum to view. Let us take a look at fluid view in action. We will then break it down and explain how it works in more detail.   The video shows the topic list and the forum filter box. As you can see, it is easy to change the topic list by changing the selected forums. This view replaces the traditional list of categories and forums.   Of course, members only can change the view to better suit your way of browsing.   You will notice a “grid” option. We have moved the grid forum theme setting into the main forum settings. This makes it an option for members only to choose. This screenshot also shows the removal of the forum breadcrumb in fluid view mode. Fluid view remembers your last forum selection so you don’t lose your place when you go back to the listing. The benefit of this feature is easy to see. It removes a potential barrier of entry for members only. It puts the spotlight on topics themselves, and not the hierarchical forum structure. You as a member will enjoy viewing many forums at once and switching between them without leaving the page. We hope that fluid view, the new functionality is an asset that you enjoy .
Sign in to follow this  
Far-I

Gasoline Question

Recommended Posts

May be a dumb question but just want to clarify:

I got a new OB almost a week ago and, after considerable will power- will finally start breakin her in on friday. i want to pamper her with premo gas, but here is what the manual says

unleaded minimum pump posted 87 octane gasoline is recommended.

(Octane based on posted rating)

(91 based on the research octane method)

So this means 87 is recommended? or 87 minimum up to a 91 rating?

i know, dumb Q, but can't be too careful.

Share this post


Link to post
Share on other sites

Go ahead and use the 87.

The pump octane rating at U.S. pumps is an average of two lab-tested octane ratings, which includes the research octane number and a motor octane number. Look at the pump the next time you fill up and you’ll see the formula, (R+M)/2.

Other countries might only use the RON as a measure of octane, which will be listed on the pump as the advertised octane. Because of this, the rating on U.S. gas pumps is typically four to five points lower than other parts of the world

Share this post


Link to post
Share on other sites

but could a higher octane rating be better overall? or should i use only 87? i know i used 87 in my older 2 stroke because the higher octane gases hadn't been developed yet when the engine was manufactured, but a brand new one, higher octane may be better?

Share this post


Link to post
Share on other sites

Problem with where we live is that I have to buy 91 to get the non-oxy fuel. My 05 Merc calls for min of 87 but warns about using oxygenated gasoline. I'll bite the bullett and fork the extra few bucks to fill my boat with the good stuff. Alcohol has some nasty side effects on some rubber o rings, seals, and gaskets.

Share this post


Link to post
Share on other sites

I go non-oxy on all small engines. If I could get non-oxy 87 oct. I would buy that but non-oxy is always 91 oct., at least that I've seen.

Share this post


Link to post
Share on other sites

Far I,

You are best off using the fuel that the manual calls for, regardless of opinions. In the "Good Old Days" before unleaded gasoline, octane ratings were generally higher and you could often buy 100 octane right at the pump. The fuel actually had additional lubricating qualities due to the tetraethyl lead used to raise the octane, but the tradeoff was toxic lead released into our environment. Buying "Premium" fuel nowdays gets you a little higher octane which actually slows down the burn rate of fuel, a property needed with higher compression motors, which todays outboards are not. An exception may be the supercharged Verados but I bet if you read the manual it will call for 87 octane. Premium fuel will NOT give you any performance increase.

The only possible exception might be to use the non-oxygenated premium fuel to avoid the ethanol content for older motors, say before the early '80's, but any motor built in the last 20 years has been designed to tolerate those fuels. Engine design must consider future warranty costs and if the seals had been specified with materials that were not tolerant of the ethanol, the manufacturer's warranty costs would skyrocket (money directly out of their pocket). Bottom line is that you should feel comfortable burning 87 octane pump gas in any engine that calls this out in the manual. The concept of using higher octane premium fuel for any reason is nonsense and simply a waste of your money. Do your homework, educate yourself and make the right decision.

Share this post


Link to post
Share on other sites

Yep good post Hydro.

The only reason to use premium fuel in a standard outboard is to stay away from ethanol. Remember though that not all premium is ethanol free.

Share this post


Link to post
Share on other sites

Straight from my manual:

"We do not recommend the use of gas which contins alcohol.

Gasoline containing alcohol may cause the following problems to you're outboard and fuel systems:

Corrosion of metal parts

deterioation of elastomers and plastic parts

wear and damage of internal engine parts

starting and operaitng difficulties

vapor lock or starvation

Some of these adverse effects are due to the tendency of gas containing alcohol to absorb moisture from the air, resulting in a phase of water and alcohol which seperates from the gasoline in the fuel tank.

The adverse effects of alchol are more severe with methanol and are worse with increasing content of alchol."

I'm more concerned with reformulated (oxygenated) fuel than with the octane rating itself. Like I said before, look at just more than just octane.

Share this post


Link to post
Share on other sites

I just read a blurb from a Yamaha engineer (NAFC Magazine). It basically said that you could run into issues running regular 10% ethanol gas in motors made prior to 1985. Anything newer and you should be fine.

I always run 87 octane. No sense spending more if the motor is designed to run on 87. Contrary to populare belief, 91 octane is not rocket fuel smile

Share this post


Link to post
Share on other sites

Contrary to populare belief, 91 octane is not rocket fuel smile

You're right, it's not. The higher the octane actually results in a slower, more controlled combustion.

Share this post


Link to post
Share on other sites

I recently purchased a bout with a 2000 Yamaha HPDI 150 and when I was in a dealership the other day the guy said to run 87. However, he also indicated that I should be adding a fuel stabilizer plus a Yamaha fuel additive (forget the name but it was like $40 and he said it would last 320 gallons). What are peoples thoughts on the fuel additives? He said it was due to the ethanol clogging things up.

Share this post


Link to post
Share on other sites

My manual also mentions some stuff like running addatives and a water seperator but the alternative is to run non-oxy fuel. I did the math and it's cheaper (and less to worry about) just to buy the non-oxy.

Share this post


Link to post
Share on other sites

I buy the "Ring-Free" additive for my 75 yamaha, my uncle had some issues and was told by the service guy that it helps prevent buildup on yammy 4 strokes.

Share this post


Link to post
Share on other sites

it seems to me that i get more power, speed and quicker take off with oxgynated 87oct than preimum non oxy gas.. as for jhoson small motors before 1980 they have cork floats and the ethonal will eat those like a pig in a apple tree

Share this post


Link to post
Share on other sites

I run non-oxy as well in a newer Optimax and have had no problems. I maybe a little overprotective with a fuel/water separator and run additives to it. I probably treat her better than anything else I have (including dog & wife!)

Share this post


Link to post
Share on other sites

it seems to me that i get more power, speed and quicker take off with oxgynated 87oct than preimum non oxy gas.

I've noticed the same thing. The lower octane burns much faster! I wish I had somewhere up here where I could get 87 non-oxy...best of both worlds.

Do you guys down by the cities have lower octane non-oxy???

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

Sign in to follow this  



  • Posts

    • The only thing to use them for, If I had one!  
    • Utube Randy Newberg spring bear hunts. He has a ton of DIY info on spring bear hunting
    • I've never used electric jacks, or hydro. I've heard they are pretty nice, and guys like them. It will be interesting to see how you feel about them after a season or two. I'd like to hear your input on them after you've used them awhile.
    • Yes, out of 100lb logs so they can't carry it away!
    • Really ufatz, that's how tomorrow  will affect fishing?? It all depends on what your fishing for. If I'm just off the flats chasing walleyes it would be interesting to see if they work there way up on top mid day. Probably not. To much of a short window.. 
    • Are fuses necessary on an on board charger?  Manual chargers do not have them,  is there a reason for them on the on board charges. I was given a system with a bank that may not have been working correctly, possibly blowing the fuse repeatedly.  My system would not be hooked up to an alternator on the engine so I'm wondering if it is fine to use the charging bank without the fuses.  The orange charging light comes on when I hook the wires directly up to a battery. I'm asking because I don't want to go through the bother of wiring this thing in my boat if I can't get it to work right. Also, I would technically only need 2 of the 3 banks to work, but I like the idea of repairing it to its potential.
    • My bait is getting hit but the bear does not like the large, cinnamon gum drops i added to the bait! He will drag them out and move on to other tasty treats. I do have red licorice to add next time.
    • Thanks...  Only truck in our neighborhood anyway....
    • Better than breaking your arse slipping on the ice.  
    • Yes!  There is no question the eclipse will affect fishing! The eclipse will draw peoples attention away from fishing and the casual angler will be all wound up about watching the event. They will not be paying attention to anything else and surely not to fishing. The result will be far fewer anglers on the stream and YOU will have more room to fish and less competition. THAT is how the eclipse will affect fishing.
  • Our Sponsors