Need help with gas/oil

[Greendice34]

im sure this has probably been asked a million times but I don't wanna go through and find it haha. So I just finished building my 2 stroke motorized bike and I don't know exactly what type of gas or oil to use. Right now I have a gallon of 87 gas and some 2 cycle oil and the things I read say to use synthetic oil and some say it doesn't matter? what kind of gas and oil should I be using if it actually matters?
Here is a link of the oil I have right now: http://www.oreillyauto.com/site/c/d....oap?ck=Search_N2385_-1_-1&pt=N2385&ppt=C1941

 

[crassius]

you'll get a lot of opinions on this

I used to use 16:1 for first gallon, then 32:1 thereafter with cheap walmart oil. With the newer motors we're getting now (if your seller gave you a new one rather than a pre-2012), I put maybe a quart or so of 16:1 in for getting it going, then add 32:1 thereafter as soon as it starts to run well.

 

[butre]

I use 50:1 from the moment I first start it all the way until the engine reaches the end of it's service life. I usually tell people to run 32:1 to be safe though.

 

[KCvale]

I run 25:1 (5.2oz 2/3 cup per gallon) non-synth for the first tank, then 32:1 (4oz 1/2cup per gallon) synthetic from then on.

 

[Fabian]

im sure this has probably been asked a million times but I don't wanna go through and find it haha. So I just finished building my 2 stroke motorized bike and I don't know exactly what type of gas or oil to use. Right now I have a gallon of 87 gas and some 2 cycle oil and the things I read say to use synthetic oil and some say it doesn't matter? what kind of gas and oil should I be using if it actually matters?
Here is a link of the oil I have right now: http://www.oreillyauto.com/site/c/d....oap?ck=Search_N2385_-1_-1&pt=N2385&ppt=C1941

I use the highest grade pump fuel, and the cheapest air-cooled specification 2-stroke oil at 25:1 - has served me very well.

 

[KCvale]

Oil doesn't combust, only gas vapors do.
All you are doing is 'watering down' your power with too much oil.

All the oil is for is lubing the bottom end and not all the intake even goes to the bottom.
The rest just fouls your plug, makes smoke, and drips out the tail pipe when you stop.

32:1 is plenty safe, less oil if it's a good synthetic like 50 parts gas to 1 part oil.

Octane does not combust either.
It actually performs the opposite, it keeps the gas/air mixture from igniting too soon in high compression engines.
These 2-stroke engines are far from high compression and little chance you will ever get a pre-detonation 'knock' as it's called unless you are running way to lean and hot.

I use premium gas because it is usually cleaner (Less Ethanol) fuel, and it makes me smile when even the clean stuff is less than $2 for 70+ miles of operation.

With most of these 2-stroke engines the bearings, cylinder walls and rings will wear out no matter how much oil you put in the mix as they are crap to begin with.

So you can live with an underpowerd, smoking, oil dripping machine and get maybe get another 100 hours out of the engine, or just give it enough of the good stuff available these days and get a power boost, no smoke, and no drips of un-burnt oil when you park the thing.

 

[Fabian]

In an air cooled engine, the oil is used as a heat mediator to carry away heat, and to quench hot spots.
That is why it is so important, (especially with poor metalurgy of these engines) to use 25:1 but an equally important factor is the hydrodynamic barrier that the oil gives; helping to prevent blow-by as the bore shape distorts from a circular shape, due to poor metalurgy.

In these engines, the oil content in the fuel actually increases power, even though the oil does not burn, and lowers the octane number.

 

[butre]

how you ride makes the biggest difference in your oiling requirements. next time you have your jug off, dip into the crankcase and see how much oil is in the bottom. always full throttle heavy load, use more oil. full throttle light load, use less. always part throttle, use more oil

 

[bakaneko]

I did 16-1 break in with premium castor synthetic oil, which was pricey. It did not smoke. I am running 25-35 after break in with cheap Menards 2-stroke oil, used for small motors and lawn equipment. It smokes a little but the price is great.

Also, I know many want to really take care of their engine and get the best performance, but for others it is a cheap hobby or transport. Therefore, how much do you want to spend on oil for a $115 dollar motor kit...

 

[KCvale]

I did 16-1 break in with premium castor synthetic oil.

Actually, using high grade synthetic oil defeats the whole purpose of "breaking in".

Breaking In is the process of letting the cylinder wall and rings wear so they end up matched well seated so they retain the most compression.
Once they wear in just right is when you want to stop the wear.

That's why you take it easy on power and use the basic lube property oils, and a lot of it, to get rid of the derbies and cool the process so the crucial ring/cylinder wall can wear in and be happy.

Do it right and you feel a gradual increase in power due to better compression as they seal up.
One tank of 25:1 is all I use, with a mix of easy riding and hard full throttle.
After that, stop the wear and lower the oil in the gas to better the power.

As for dissipating heat, umm, I shall remain nice and just say you adjust the heat range by the spark plug and not by the gas/oil mix in way shape or form.