What fuel do you suggest for a 4 stroke .25 OS?

Thanks

Del

what fuel do you already have?....omega 15% would work

any name brand should work

I have been using 10-15% in my 2 stroke engines. Someone suggest 0% at the fly field due to overheating?

Thought I'd ask here.

Del

Use the Omega 15%, Cool Power 15%, Power Master 15%, etc. You want at least 17% lube, 18% to 20% is better. The 15% nitro has run very well in all of my four strokes. Saito 45 through Mag 91. I've got an O.S. 1.20 on the shelf and it will get the same.

Don

I use the same (10% nitro, 18% oil) fuel that I put in my 2-stroke engines... never had a problem so far.

OS suggests using fuel with 5-15% nitro and at least 18% oil 20% being better sinthetic is OK a little castor is good but not necessary.
I run Powermaster10%nitro18%oil and my engines run great in the 2st as well as the 4-4st engines that I use in my planes.

You'll find that 4-strokes need 10 to 15% nitro or they will not run properly.

I use 15% Cool Power and never had a problem with it.

i use model technics duraglo 10% in all my 2stroke and 4stroke engines,never ever had a problem.

My 4stroke was a bear to start. People then shared the advice that 4strokes need nitro to start. I was told that 15% was the minimum that could be relied on.

One of the guy's 4strokes shut off on low motor a lot one day. The 4stroke experts told him that 4strokes won't stay warm enough without enough nitro and without a special 4stroke glowplug.

yes you need a special 4-stroke plug
Since the engine fires every other stroke, the glow plug is more prone to cool down than in a 2-stroke engine.
nitro helps in this regard as well, but it is not obligatory. My engines are fine with just 10% nitro.

Yeah with the right plug, after break in, I'm getting very low reliable idles on my four strokers using 10% Nitro fuel.

Powermaster 15/20 in all my four strokers.

Powermaster 20/20 It is worth the extra for the reliable idle in my inverted 4 strokes