Why do 2 stroke motors run different ratio's of oil in the fuel mix
- Thread starter ride65
- Start date
BarelyAWake
New Member
Well, if yer talking about different brands and type of motors than just our chinagirls - much of the variance in manufacturer's recommendations has to do with that specific engine's machining tolerances, operating RPM range, and application.
If yer askin' bout just our lil bike motors - depends on what the owner is willing to experiment with. The manufacturer's "16:1 & 20:1" recommendations for our bike may in fact include the possibility of using standard (read low-grade) motor oil instead of 2 cycle, but these are sloppy lil motors that may or may not need a lil extra lube... but therein lurks a debate lol
I'm quite happy running 36:1 with Amsoil's synthetic "50:1" but some are of course running the 100:1 stuff at various ratios... it's up to you
If yer askin' bout just our lil bike motors - depends on what the owner is willing to experiment with. The manufacturer's "16:1 & 20:1" recommendations for our bike may in fact include the possibility of using standard (read low-grade) motor oil instead of 2 cycle, but these are sloppy lil motors that may or may not need a lil extra lube... but therein lurks a debate lol
I'm quite happy running 36:1 with Amsoil's synthetic "50:1" but some are of course running the 100:1 stuff at various ratios... it's up to you
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Venice Motor Bikes
Custom Builder / Dealer/Los Angeles
I use regular 2-cycle oil, & break in the engine with 24:1 mix. After the break in, I use 32:1.
Bikeguy Joe
Godfather of Motorized Bicycles
Venice got those instructions from me. 
Environmentally conscious individuals will use 50:1 or synthetic 100:1. Others need to leave a trail behind so they won't get lost so use more oil.
FYI more oil in the gas results in a leaner mixture, not richer.
BarelyAWake
New Member
1:1
I wanna see pics tho o.o
I wanna see pics tho o.o
Bikeguy Joe
Godfather of Motorized Bicycles
Environmentally conscious individuals will use 50:1 or synthetic 100:1. Others need to leave a trail behind so they won't get lost so use more oil.
FYI more oil in the gas results in a leaner mixture, not richer.
I believe the OP meant richer as in "oil to gasoline".
But, yes think about it....at 32:1 you have twice as much gasoline running through the jet than you do at 16:1.
In honesty, I run 40:1 any more since all my other "goodies" run that mix.
I have recommended 24:1 in the past because I have had a couple of Big Name sellers ask me to refrain from suggesting anything but 16:1 or 20:1 for warranty reasons, so that is sort of a compromise.
So, for the record, run whatever you are comfortable running, and live with the concequences.
Bikeguy Joe
Godfather of Motorized Bicycles
I do know that most of these engines are soooo loose that any amount of oil film is not going to make a huge difference. Oil film is only so thick, no matter what ratio you use.
That pretty much sums up the situation and is best advice of all.
Personally I think 40:1 is fine and generates almost no smoke. 16:1 and 20:1 guys really bug me though because they leave those black areas in my driveway. Grrrr.... dam chinese instructions!
Oh yes, bandito really nailed this topic
Quote: It seems to me the oil ratio mix is in direct proportion to the owners ego!
After a lot of research and a topic i covered extensively in a previous posting on the internet, the ideal oil/fuel ratio covering a number of performance parameters, including longevity is 20:1
That's it - with plain old cheap 2-stroke mineral oil, you will have good power and long engine life with 20:1 and this covers aspects of hydro/mechanical piston ring seal and good thermal management of high temperature locations in the cylinder.
The other critical aspect for long engine life is "NOT" to rev the engine over 3500 rpm, regardless of how many people tell you that they rev their engine to 7500 rpm.
Run wide open throttle as long as you like but don't rev the engine over 3500 rpm.
Fabian
Quote: It seems to me the oil ratio mix is in direct proportion to the owners ego!
After a lot of research and a topic i covered extensively in a previous posting on the internet, the ideal oil/fuel ratio covering a number of performance parameters, including longevity is 20:1
That's it - with plain old cheap 2-stroke mineral oil, you will have good power and long engine life with 20:1 and this covers aspects of hydro/mechanical piston ring seal and good thermal management of high temperature locations in the cylinder.
The other critical aspect for long engine life is "NOT" to rev the engine over 3500 rpm, regardless of how many people tell you that they rev their engine to 7500 rpm.
Run wide open throttle as long as you like but don't rev the engine over 3500 rpm.
Fabian
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I heard it was IQ. If that's true 100:1 guys must be GENIUSES of the bike motor world.
momentummotorgroup
New Member
I use Opti-2. the you can find it at most mower shops. This stuff is simple. 1 packet to 1 gallon, for ALL two stroke motors. The guy at my local shop is stingy as he!!, and is still running mowers and motors that are years beyond their warranties off of this stuff. I have breathed new life into my older bikes with this, and just got done breaking in a new 66cc engine off of an initial tank of this stuff with absolutely no variance from the 100:1 mix. Ran like a champ the entire way through.
It's my go-to choice from now on.
Check out the LINK
It's my go-to choice from now on.
Check out the LINK
HoughMade
New Member
That's true, but I think using "rich vs. lean" for oil mix introduces a little confusion into the conversation. The terms "rich vs. lean" for fuel and air is the accepted terminology in the engine world. Perhaps we could use "more oil" vs. "less oil" instead of "rich" or "lean" when speaking of oil and avoid the confusion....but whatever- it ain't going to ruin my day if people ignore my friendly suggestion.