Give me some time to look some stuff up, but in the meantime, feel free to peruse this link - http://www.brasil.terravista.pt/jenipabu/3786/enalcohol.htm
What started this, at least with me, was a semi-friendly discussion with a mopedmocker, as I calls em, and the conversation turned to fuel, so I made a bet with him -"This thing would run on anything from JP4 to cheap perfume"...which wound up with me draining the tank and pouring in a bottle of some $1.99 'perfume' which is mostly alcohol, and then riding around the block on it.
It ran poorly and the exhaust smelled awful funky, but it DID run, even so....
Later I started spiking my gas heavily with denatured Methyl Alcohol 91%.
Some drugstores carry this, but it's not really cost effective, considering how many bottles you'd have to buy at about $0.89ea to make 1 gallon.
(Do not Isopropyl for this, ok ? - but Iso cut with water in a spray bottle does make a handy de-icer for the hardcore winter rider.)
You'd have to upgrage your ignition, if possible, and definately go up one or two heat ranges in spark plug type, crossover four-bars are reccommended (tho not splitfire, due to all the bad reviews they've gotten.) since vaporised alcohol is slightly harder to ignite than gasoline.
More compression would help, but I do not see any easy way to go about that with a simple 2-stroke engine, of the type mopeds use...it may be possible, I dunno.
Bigger carb/jet, 2 or more sizes, because although all in all Alcohol is a more efficient fuel, you will need to deliver more of it to the system to produce the same amount of power.
Fuel/air mix, this would require some fine tuning, since you want to push more oxygen in there along with more fuel, in order to actually cause the vaporized liquid to 'explode' like it is supposed to.
Oil/Fuel mix, this one's tricky since it's hard to find a good two-stroke oil that will properly mix, but you can use the type they used in model aircraft, which seems to work better....Myself, I spiked the oil with a little Cox409 fuel to thin it out and since Cox409 is mostly methanol, it made damn sure I got good combustion too.
It can be done, and has been done, by more than one 'ped rider, but unless you have your own backyard still (unlikely) there just isn't any way to make it both legal and cost-effective without breaking the stranglehold the oil companies have on our society.
Also, just in case anyone's wonderin what the hell Vegetable-Diesel (or VegeDiesel) is, how it's made..etc.
You take some vegetable oil/grease, etc...like, say, what comes out of the fry vats at the burger joints every night, since there's plenty of that....add a little methanol, in a drum, and kick/pound/stir the drum for a while.....when the mix is right, you pour it into 5 gallon gans and viola !, VegeDiesel....you can pour it right into any diesel vehicle that exists today with no modification of the engine whatsoever, although I'd not reccommend pouring it in the same tank with petroleum diesel.
And check this...the crud it leaves at the bottom of the barrel ? it's glycerine soap, believe it or not, you can wash the vehicle with it, if you wanna.
Choke on a hairball, OPEC.