Many stories about the fuel in Brazil... Here is an other one... Mostly to set your minds at easy.
Fuel in Brazil does NOT contain alcohol... Not even a drop can be found in what they call: Gasolina Commun.
You can safely use it and you don,t need to replace old rubber parts... they will not dissolve.
There is an other type of fuel. It,s called Alcool (pronounce Alcohol) and this, as you might have guessed, containes 25 % alcohol... But your bike will never run on it... You need a special setup for this... To bad course it,s half the price of commun.
I did find however that the fuel does contain something else... I dpon,t know what it is, but it makes the bike run a bit lean... Only while ideling, so I adjusted (after checking everything for false air etc...) the idle-jets a bit. For a honda africa twin, one turn out. (standaard is 2,5... so now 3,5... but do it on feeling)
I guess there is an aditive witch uses volume, but does not contribute to the burn... and thus... lean burn.
Since the africa twin is already a "lean burn" engine... other,s might not even pick it up... I just found it ideling a bit rough... and I dont like that.
I would advise against the expensive fuel... Some say it,s better but I think it,s not. It contains many aditives witch are not always consequent of mix... I tried it once and my bike did not like the taste of it... and it left a red deposit in the fuel-chambers... notting dangerous but stil...
So.. Stop your worries... and fill up with commun....
Maarten
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