Preferred Pre-Mix Ratio??

Discussion in '2-Stroke Engines' started by mcassMB6, Jul 4, 2008.

  1. mcassMB6

    mcassMB6 Member

    Hey Everybody- just a quick survey. I'm trying to get a sense of how to adjust my premix ratio as my mileage increases. Hope this poll gives me some insight.

    Mileage____? Ratio_____?

    I'm running 16:1 (less than 100 miles on engine)

  2. Skyliner70cc

    Skyliner70cc Active Member

    Yuk, 16:1 is too messy. The china engine ratios from manufacturer are based on the fact that Chinese use motor oil and don't have good oil technology yet. With our advanced 2 stroke oils, 40:1 should be just fine and 50:1 would be ok if you use Maxima 927 or Klotz supertechniplate. This oil mixtures I stated do not apply to bushing engines.
  3. crazeehorse

    crazeehorse Member

    i agree, i have wondered why these engines would be any different, that they would need that much more oil, than my say my chainsaw. i mix my synthetic from tractor supply 50:1 . my engine runs smooth, much better than @ 20:1. in my humble opinion, if you mix any heavier, than what the oil mfr. suggests, it is just a waste of money, loss of performance , & could cause premature plug fouling.
  4. Skyliner70cc

    Skyliner70cc Active Member

    Be warned though, you may void your engine warranty if you use my recommended mixture assuming you had one in the first place. As a general rule of thumb when it comes to these engines, you are your own warranty :)
  5. BSA

    BSA Guest

  6. crazeehorse

    crazeehorse Member

    was'nt that article written in 1978? now i'm not an expert, but if we are talking plain 2 stroke oil, or motor oil ,then by all means, go rich, it'll just smoke more. but i have read several articles over the years about 2 cycle mix,plus my experience (i was a timber cutter for about 6 yrs. in the 80's) and had to protect the high priced engines of our chainsaws. i mix my synthetic 50:1 , i do check the piston, & cylinder wall . it has no scuffing. if you run you finger over the piston, there is a very light residue, that feels very slick. so i know the oil is working properly. i broke mine in like the manual said.but after i use 32:1 for a couple of tanks, then i went full synthetic 50:1. all i'm saying is there is a world of difference between 2 stroke oil 30 yrs ago, & todays full synthetic 2 stroke oils.
  7. mcassMB6

    mcassMB6 Member

    So are you guys saying I should run something other than 16:1?
  8. crazeehorse

    crazeehorse Member

    i think if you ask 10 people, you will get at least 6 or 7 different answers. i would follow the 16:1, then 24:1 till your warranty is up then i would switch to synthetic & at least go 32:1. i know my chain saw has run 50:1 for 4 yrs, it works much harder than my bike engine. the head is easy to take off & inspect, so the best answer is to try a few mixes, it's allways gonna be a personal preference. i just think the if you mix you should mix what the the oil mfr's directions say, & so far great results.
  9. TCSuperCycle

    TCSuperCycle New Member

    I tried running 16:1 for a bit and my engine would not run at all. I checked the plug and it was gummy with oil resin on it. I changed my mixture to about 30:1 and it started first try. I did foul the plug though from running to much oil but once I replaced it with the new mixture I have not had a problem since then.
  10. Pablo

    Pablo Motored Bikes Sponsor


    Even with a borderline OTC oil, no need to run that oil rich after 100 miles.

    Pick a good oil and use 30:1 as a minimum. Most top tier oils won't have any problem with 40:1 or even 50:1. Yes it is true that some race engines can produce more power with very oil mixtures, but often these engines are cleaned regularly.
  11. alex

    alex Guest

    Ok, so I have a king's engine with about 3,500 miles on it, and I am currently running a 32:1 mixture with castrol 2t oil non-synthetic.

    I want to switch to synthetic, but without compromising performance. While still protecting my engine. I'm afraid that 32:1 synthetic is too rich. What should I run it at?
  12. Pablo

    Pablo Motored Bikes Sponsor

    32:1 should be fine! You could back it off to 35:1. Your bike probably won't notice.
  13. In my experience I ran my engine 6 oz of castor to a gallon I don't know what that ratio is. I goofed a few times with my mixing and mixed by accident maybe only 3 oz non castor per gallon and payed for it when my bearing failed.
    Now that she's rebuilt again castor to me is too expensive so now I use 8 oz to a gallon of the auto store stuff.
    I don't care that I'm using too much. I know I am.
    But those crank bearings are depending on your GAS to burn and the oily BURNT RESIDUE to get to them I've always thought this method of lubrication is rather barbaric even though this is the way small 2 strokes are.
    If I remember right on Motocross bikes they at least have some kind of oil injection pump or something that gets that oil on them 2 stroke bearings on top of depending on the trickle down but the HT does not have this. In fact,it's basically the same as the small 2 strokes out there that are not pulling your 250 pounds of lady killer.
    So as long as the gas is combusting and my exhaust is clear and I keep that shop rag under my bike at night to collect that burnt black oil it's overkill for me.
    And I find it seems to be running a bit quieter even with my opened up exhaust.
    Maybe it's time for another cleaning.
  14. Skyliner70cc

    Skyliner70cc Active Member

    The article is a good read but it is from 1978 and no longer valid. There have been incredible advances in oil technology since fact, there have been incredible advances in the past 5 years alone.

    Me, I'm old fashioned. Its nothing but castor oil for me. Guess what, castor is stablized, degummed, and fortified to account for its past issue with oxidation. I have 2 bikes with 5 month old castor oil fuel mix in their tanks and they fire up just fine and I have yet to foul a plug. I run from a 32:1 mix in 2 of my bikes to a 50:1 mix in one of my test bikes. I personally prefer a richer oil mixture because it leans out my air/fuel ratio which helps at my high altitude where the engine mixture is already pig rich.
  15. gator72007

    gator72007 New Member

    I just recieved my "80"cc kit from bikeberry yesterday, in the instructions supplied with the kit it says use 40:1 mix ratio, and gives no break-in procedures.
  16. Mountainman

    Mountainman Active Member

    sounds silly !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

    a new engine running at 40:1
    better yet -- no break in period

    my ex wife bought a new Toyota MR2 years ago just before I met her
    the dumb salesman told her to just run it hard -- no REAL break in needed
    she said that she had taken it well above a 100 mph the first weekend out


    (((((((((( DID THAT THING BURN A LOT OF OIL ))))))))))

    I don't know this exact engine you are talking about here
    I don't know ther exact engine sellers by name or anyTHING
    but -- for a new engine I think 40:1 mix is way more that a silly THING

    ride that thing
  17. gator72007

    gator72007 New Member

    I agree, no way i will break in at 40:1

    I was just stating what the manual read.
  18. twang

    twang New Member

    I think I ran probably one tank at 16:1, the motor just would not perform at that ratio, I changed to 25:1 and it made the world of difference, I reckon 30:1 or 40:1 would be even better, I'll let you know when I have tried it, but you do get freak motors, mine is stock standard and really flies compared to my brothers and nephews.
  19. bamabikeguy

    bamabikeguy Active Member

    I know two guys who didn't do the break-in thoroughly, varying those speeds, and now they can't hardly top out at 20 mph.

    Those who do go through that procedure, seem to always improve on mpg and torque, just a notch at a time.

    One handy way to do it is look ahead to a large tree, hold it at some speed until you reach it, then spot a mailbox, throttle down or up, whatever. That way it is 15 seconds, then maybe 25, etc.

    Just keep picking out landmarks, and the time passes swiftly as you leapfrog down the road.
  20. Revorunner

    Revorunner Member

    Been using this oil in my Vespa p200e since total rebuild 600 miles ago without any problems.

    At 50/1 mix.

    Runs like a charm.:grin5::grin5:

    Had a soft seize at 50mph on highway before the rebuild.Rear tire locked up solid.Almost got run over by the truck that was following me.:ack2::ack2:

    Was using regular two stroke oil in it then.:whistling::whistling: