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Thread: fuel additive for r50/2

  1. #1

    fuel additive for r50/2

    i inherited a 69 r50/2 last year. i am learning more about it everday. i have been told it runs on leaded gas. so i need to get a lead additive for it. if true what is the recommended type and what is the easiest way of measuring and the best way to store it while riding the bike on trips. what is the best grade of gas to get now that there is ethanol in it.

  2. #2
    Liaison 20774's Avatar
    Join Date
    Sep 2005
    San Antonio, TX
    Probably all an additive is going to do is lighten your wallet. I ran unleaded in my R69S for a year or more...then I did a top end which changed the valves/seats to the unleaded variety. I've been running unleaded in my '73 Firebird for real harm.

    If you live near a station that sells "real" gas, you could put a tank of that in every 3rd or 4th tank. Find the nearest gas station at

    As for octane, the low compression engine should only require the lowest octane. If it doesn't ping on the low octane, you're fine. If you want to hedge your bets, use the middle grade. In the end, too much octane can leave deposits in the combustion chamber because it doesn't burn the way it should in a low compression engine.
    Kurt -- Forum Liaison ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  3. #3
    Cannonball Rider #52 darrylri's Avatar
    Join Date
    Oct 2003
    Surf City, USA (Santa Cruz, CA)
    I've been running my R60/2 on unleaded for 17 years. Don't worry about it.

    If you can only get 10% ethanol gas, keep an eye on your fuel lines, they may rot out from the inside.
    --Darryl Richman, forum liaison

  4. #4
    BMW MOA co-founder bmwdean's Avatar
    Join Date
    Mar 2003
    Tucson, AZ, & Madison, WI
    Depending where you live, you may be able to find ethanol-free gas. It is widely available in So. Wisconsin, less so in Arizona:
    Jeff Dean
    Tucson, Arizona, and Madison, Wisconsin
    Co-founder, 1972, of BMW MOA --
    2017 R1200RT, 2019 R1250RT, 1967 R60/2

  5. #5
    thanks for the input.

  6. #6
    Registered User gertiektn's Avatar
    Join Date
    Aug 2009
    Ketchikan, Alaska

    Airplane Gas

    Before I had my engine rebuilt. I was able to get some 100 Octane Leaded AV gas and added a bit to each tankful just to be safe. It ran great on the 100% AV gas but 100 % was over kill an so I did a quart per tank.
    When you get around to the slingers. you can update the valves and seats. Most likely it is an over worried problem as stated by the experts.

    Jim, Ketchikan, Alaska
    I like good stuff. No Chains here!
    1960 R50 -"Hanz"
    1977 R75/7 -"Gertie"
    2004 R1100s -"RFAR1"

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