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Thread: AVGAS in your TW

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    Member Denn's Avatar
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    AVGAS in your TW

    Have any of you run AVGAS in your TW? I run it in my mower, chainsaw, generator etc. I used to run it in my pickup before my volume source dried up. I still get a quart or two a week which is enough to get me to work and back. Any issues? So far I have only run it about 30-40%. What about any additives. Does anyone put anything in their fuel or oil?
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    Senior Member SHAG's Avatar
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    Are you talking about Non Ethanol ? If so, they call it REC Fuel around here and it's about 80 cents more per gallon. I use it in my handheld stuff most of the time and in my sit-downers especially during storing off season. During riding season I run 87..
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    Senior Member elime's Avatar
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    I tried AvGas in a car I had and the garage ended up smelling like a Cessna. Honestly, I couldn't tell a difference.
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    GOF
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    I always run non-ethanol in my bikes. As for octane 87 works fine. Unless you are running high compression or large advance on timing I don't think higher octane is any use.
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    Ken
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    I have been running the ethanol stuff for so long I wouldn't know which runs better now. I use Marvel Mystery Oil in it and did one carb overhaul over 40,000 miles. I Kreem tank lined my fuel tank which I believe kept more contaminants out also.
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    Senior Member mountain yawp's Avatar
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    I usually try to avoid running gas with ethanol in my TW, but a I have been force to use it a few times and didnt notice any difference. I would not ever store a carbed engine with the stuff in it. I bought a KLR last year that had been run and stored with the ethanol gas and it had ruined the fuel hose, melted the fuel filter mesh, melted the vacuum diaphragm in the petcock, and caused a strange green-yellow slime to form in the carb.
    Since you never know when you may have to spontaneously store your TW or other small engine, I recommend only running ethanol free gas in them.

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    Senior Member mountain yawp's Avatar
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    And the KLR with the ruined fuel system is a 2011 with 6,000 miles that had been sitting "about a year or so", which seemed fairly accurate based on other evidence. So it was not an old bike that had sat forever.
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    Member BuddyMack's Avatar
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    I know guys who ran AVgas in their street cars for drag racing only to have it eat the top of their pistons. Not right away, and usually in higher concentrations. You know, applying the "if a little is good then a whole lot is much better" axiom!

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    Senior Member CJ7Pilot's Avatar
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    Quote Originally Posted by BuddyMack View Post
    I know guys who ran AVgas in their street cars for drag racing only to have it eat the top of their pistons. Not right away, and usually in higher concentrations. You know, applying the "if a little is good then a whole lot is much better" axiom!

    Sent from my LG-TP260 using Tapatalk
    That's probably because they advanced their timing too far.

    AvGas is 100 octane, so people like push the limits of the spark advance in their hot rods... sometimes too much.

    If AvGas eroded aluminum pistons, we wouldn't use it in airplanes....
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    Super Moderator JerseyJeeper's Avatar
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    As far as I know av gas is leaded (cjpilot can speak to the current facts). If it is still leaded theses days don't use it in anything with a catalytic converter or oxygen sensor. It's high octane which is good if you need it, lead is good as well fir many reasons (except eating). In fact it's a great fuel if it fits your application. I'm not sure if it will affect injected engines that have no emission controls (race bikes), my guess is it won't. CJ?
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