Oil mixture help! (yes I used search

Discussion in '2-Stroke Engines' started by Rockchuck, Oct 8, 2016.

  1. Rockchuck

    Rockchuck Guest

    Hey guys, I had someone build my bike a few days ago and he told me that it was running 4:1. I thought it seemed to low but I'm really new to this and have seen many different opinions. I have been breaking it in by only going 15-20 at max, and only for 20 mins max(this is the correct procedure right?). So I'm wondering what ratio I should run for the second tank. I have heard so many different things that now I'm confused. Thanks!
     

  2. rockchuck

    rockchuck New Member

    Edit : sorry guys he put 4 oz per gallon(32:1 right?).he also said there was no need to change the ratio after the break in. Any other tips for breaking it in so I can get the best speeds?
     
  3. jaguar

    jaguar Well-Known Member

    normal ratio is 20:1 for regular oil.
    It's 25:1 for semi-synthetic oil (in case you want less exhaust smoke)
     
  4. crassius

    crassius Well-Known Member

    note: advice about oil ratios differs between countries as gas differs also between countries - 32:1 is common in US when using gas without a high alcohol content
     
  5. jaguar

    jaguar Well-Known Member

    I just did an internet search on the topic of recommendations for use of ethanol containing gas and couldn't find a single mention of a different oil/gas ratio as a recommendation.
     
  6. butre

    butre Well-Known Member

    neither gas nor alcohol have any lubricity of their own, so you don't have anything to worry about there. I stick with 50:1 using leaded 100 octane fuel
     
  7. crassius

    crassius Well-Known Member

    I have my old manuals for converting 40s and 50s motorcycles to alcohol - MUCH less energy content in alcohol, so jet sizes are to be increased by a %150 flow rate - no info about oil dissolving in alcohol and being thereby lost in the combustion - so outside US, I'd go by local standards.
     
  8. Frankenstein

    Frankenstein Active Member

    I honestly can't tell if you're serious right now. ;)
     
  9. butre

    butre Well-Known Member

    avgas is about 30 cents more expensive per gallon than 90 octane unleaded ethanol-free, and with the fuel economy you get on one of these things it's not hurting my wallet too much.
     
  10. Frankenstein

    Frankenstein Active Member

    You're usuing actual leaded aviation fuel? Nice, what oil are you running 50:1 at? What's your compression and what spark plug are you useing,and cdi if you don't mind me asking.
     
  11. butre

    butre Well-Known Member

    just the regular bottles of lucas you get at the autozone, good quality but nothing especially fancy. same stuff I run in my weedeater and my chain saw. compression on my daily bike is 193 and 210 on my race bike, the CDI is stock because jag CDIs didn't support that kind of RPM back when I built them. I've got the timing retarded via a manic mechanic adjustable magnet so it runs like sh*t at mid rpm where it's both not timed correctly and just before the pipe kicks in but rips at high and low rpms. I plan on getting a jag cdi sooner or later, just a matter of doing it.

    lots of people on the facebook groups are running avgas. it's the cheapest way to get past 93 octane other than e85
     
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