All 2st Increasing oil = increased compression?

If you managed to read the link on the "Future of the 2 stroke" and fuel injected smokers then you may have also read the comment that increasing oil in your mix ratio will also increase the compression of the engine.
Theory is that the oil content is what increases the seal between the rings and the head.

What is the power difference between running rich compared to running lean? Is there any at all?

Im running 50:1 in my 09 WR300 only because thats what I ran in my KTM
and its better to have to much then not enough in hot conitions IMO.

Only 50:1! I never use less then 2,5%. In the winter i use 3% in the woods, and up to 3,5% when it´s cold and we go iceracing on high revs on WOT a lot. With a good jetting i can´t find anything negative with a higher percentage of oil for protection. I never foul plugs.

After checking a few posts and yours above it seems 50:1 is too lean for Husky.

Is the mix ratio a personal pref thing or is it simply better for the engine to have more oil
ie 30:1 comp to 50:1

I guess there is as much opinions about this as there is people, but i prefer to use closer to 3% than 2%. Why not? What could go wrongif the ebgine runs fine and doesn´t clog up? I have almost no spooge at 3% on mine.

Ithink it has alot with engine revs to do also. a screaming 125 should need more lube then a lowrevving 500 i think. Just my thoughts.

This is a great article about 2 stroke mixes..amazing that castor oil had least engine wear.

http://articles.superhunky.com/4/194

I guess there is as much opinions about this as there is people



Johnny

That is only if you are using the oil recommended by the engine maker.
Otherwise use the recommended ratios of the oil manufacturer.
BUT, It is a matter of RPM and oil migration. Low rev engines need less oil as the oil moves slower through the engine. Higher rev engines need more oil because the oil is migrating through much faster and the engines develop more heat. That is why you hear so much about people rebuilding crankshafts a lot more often these days on 2 strokes. Not enough oil. Just because it seems to be enough oil for the piston, doesn't mean it is enough for the crank and rod bearings. More oil does also seal the rings better for more horsepower. That has been a dyno proven fact. Back when I rode for Suzuki, we ran Suzuki CCI oil at 20:1. Very clean burning as it flashed out once it got into the combustion chamber. You want a 2 stroke oil with a realitivly low flash point. Once in the combustion chamber it has already done its job. I don't feel comfortable using most oils at ratios above 40:1 .

That depends heavily on what oil you are using. You can't just recommend 60:1 or 100:1 oil ratios unless the oil maker recommends that.

For every single 2T oil that Motorex makes, their website states the following:

For pre-mix and separate lubrication (mixing ratios in accordance with manufacturer’s recommendation).


No exceptions.

I'm not sure any oil company recommends otherwise. They may claim that their oil can be used in 100:1 or 60:1 or 50:1 applications, but they always (as far as I know) recommend using the engine manufacturer's recommendation. I have never found one that explicitly states otherwise.

60:1 is too lean a mixture for most oils. They only recommend this for EPA reasons. Not engine longivity or performance. You would not want to use an oil specially formulated for 100:1 at 32:1. It may gum up something. I have used Opti2 which is formulated at 100:1 in my low RPM aeroplane engine with good results. BUT when I use this same oil in my motorcycle engines I mix at 70:1 or 80:1. Much higher RPMs envolved.
Husqvarna recommends 25:1 on breaking on the 125 and 150 engines and then 32:1. I could see this using an oil like Maxima Super M or 927.
I think 40:1 would be plenty for a 250 or 300cc engine. If you like Spectro, I found that 40:1 is the best ratio to use. Not the 50:1 they recommend. Problem with Golden Spectro is that it clogs spark arrestors pretty fast at richer ratios. Same with BelRay MC1.

Sorry if this sounds harsh, but I am not sure how I can be more clear.

I am not supporting 60:1, or any other specific ratio. Let me try again...

I can find no major oil manufcturer that recommends any specific oil ratio. Not 60:1, not 100:1, not 40:1.... They all suggest you follow what the engine manufacturer recommends.

When they say their oil is good for 60:1, they mean it can be used where the engine manufacturer recommends 60:1. They do not mean you can go run your dirt bike at 60:1 when the manufacturer of that dirt bike recommends 32:1.

If you choose to run a bike at 60:1, or any other ratio, then so be it. That is entirely up to you. Live long and prosper.

Don't let it seeeze

BillO, I have found that if you want to run hard and long that KY gelly is some pretty good sh--t. It does leave some spooge though.