Most oil injected outboards run around 100:1. What makes the HP Injector perform so different between an oil injected vs premix that you can't premix it at 100:1. Just curious as I'm shure others are as well. I plan to switch over to HP Injecter in my 02' 130 Yami.

Good question, but one I don't know and am going to have to find out about and post back when I do. It will likely be Monday before I can get the right info.

Yes, most oil injected engines at mid throttle are actually running 100-1 or even leaner. But at idle and low end acceleration they run richer, as at wide-open-throttle they run richer -- most are a variable ratio according to the power curve of the engine.

Much appreciated Oilman.

Sorry to take so long to get back on this - we had 20" of rain here (Tallahassee, FL) from Fay. Power was out about 4 hours, cable/internet have been out for 3 days, and the 1/2 mile of dirt road to get out from my house was cut in 3 places. Replying to forums has been at the bottom of the priority list.

The question was - if you take an oil injected outboard and disable/remove the oil injection system and use pre-mix only, why do you need to use 50-1 mix ratio using AMSOIL HP-Injector oil? Most oil injection systems are a variable ratio system. If you were to only ever run a mid-throttle you can get by with a very lean ratio - probably even much leaner than 100-1; but at start-up and idle/low-end throttle most variable ratio systems run at around 50-1, and at wide-open throttle they run even richer. To get safe lubrication for all operating conditions AMSOIL recommends that when using HP-Injector as a pre-mix use it at 50-1. (AMSOIL Saber Outboard is a much richer oil and it can be used as lean as 100-1.)

Sounds good. Thanks oilman. Hopefully you guys don't see more rain from Gustov.

fishinmajishin, I run a '77 Jonny 35 on my pontoon and Amsoil Sabre Outboard premixis all I feed it! The first tank of the year is 80:1 after that it's 100:1 for the rest of the season. If I recall correctly, this was my 13th or 14th season using Amsoil Sabre Outboard premix. Just try a tankfull in that motor, you WILL definitely notice MANY improvements! BTW, I push a 24' Weeres pontoon with 21" tubes, so that motor is working. Phred52

I have a 1977 evinrude 115 that I run a mix of 40:1 right now.
I have a 1974 19ft crestliner trihull.
I buy what ever oil is the cheapest on the shelf at the time of purchase of the gas.
I have been running the cheap super unleaded gas in the motor.

Top speed is about 30mph.
at low idle everyone gets wet.

I know I am probably doing it all wrong.

What advantages would I have by switching over oil and what proper gas should I be using?

Now I know everyone's opinion is going to be different.

Any and all advice will be considered.

thanks
brad

Oilman, I have been running the Saber outboard oil in my 61 3hp evinrude and my 89 25hp merc and it works great but I have ran out of the saber and have used some of the standard 2-stroke oil in them for a couple of tanks. I know that its not recomeded but how much different is it than the saber and at a 50-1 to 70-1 would there be a problem running the standard 2 stroke oil?

Question mnhunter2? When you say 'standard 2 stroke oil' do you mean AMSOIL HP Injector? Both Saber Outboard and HP Injector are diester based, ashless oils. The Saber Outboard is much richer and able to be used as lean as 100-1, it is also heavier or thicker. The HP Injector is thinner - the injection systems are critical to viscosity. The HP Injector is rated as a pre-mix at 50-1. (See my post above about the variable ratio and why don't use HP Inj. leaner than 50-1.)

If you mean 'standard' as a conventional petroleum based lubricant, AMSOIL Saber Outboard is entirely different. AMSOIL's ashless formula burns away clean, leaving no carbon behind. The AMSOIL will reduce emissions 60% or more compared to petroleum based lubes - every fisherman ought to take this to heart - reduce emissions, reduce polution in the fishing waters!

Reply to bd477 --
Cheap oil will leave behind carbon buildup, raising compression ratio and requiring higher and higher octane fuel.
AMSOIL Saber Outboard pre-mix burns clean, leaves no carbon, and will clean pre-existing carbon. A word of caution - if you have been using cheap oils you probably have a good bit of carbon buildup, you should have your engine decarboned first. (Cheap oil = more expensive maintenance, you may save a few pennies on the oil, but you will get higher wear and have higher maintenance costs in the long run. AMSOIL is higher priced, but lower cost!)

Most 2-cycle engines would prefer no-oxigenated gasoline, gasoline with no alcohol, but that is becoming harder and harder to find. Almost all pump gas in many states is 10% or perhaps a little higher alcohol now. Good luck on your gas, there are few good answers anymore. In general I would recommend use the lowest octane your engine performs well with.