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Ethanol gas residue.
I have read quite a bit about "brown talcum powder type stuff" in carbs by people who think it's rust. It is NOT rust! I build bikes, and also work on boats, and this stuff showed up heavy in the fuel tank of one of the boats I worked on. Trouble was, the tanks were stainless steel, so this stuff could NOT be rust. I had to find out what it was and the results are in, after a LOT of research!
It seems that ethanol reacts to oxygen, and the resultant residue is the byproduct of the breakdown of the ethanol. It begins in around 90 days of sitting in the tank untreated. It sticks to the insides of the tank and then flakes off, in the consistency of talcum powder, and will go through regular fuel filters like they weren't there. To catch it requires a 10 micron or smaller filter. It loads up beneath the pilot jets and makes it nearly impossible to "dial in" the carbs to idle right. "Kreem" can help immediately to seal it off, but if ethanol fuel is left sitting in there untreated it will foul that too. It does come off the inside of the tank when the tank is "banged", much heavier, making people think it is surface rust knocked loose. Two solutions I have found;
Buy non-ehtanol fuel(fat chance here in the US, They actually want to pass laws to make the content 20% instead or the present 10-15%).
or;
TREAT the fuel with additives sold everywhere.
Otherwise you will just have to ride hard and a lot so the fuel never gets old! ;-} I know, a third, sorry but I just had to put that in since it is my personal solution.
I bought a PAIR of GS850G's for 460 bucks and found this stuff in them. The first one I got running (and put 8K miles on in the first 7 months I had them) had this stuff under the rubber plugs that the pilot jets live under in the CV32mm carbs, and it has been one hell of a "chase" getting it cleared out!
If you have to leave the bike sit for more than a very short time, treat that fuel. Carb cleaner does not clean this stuff up either! The prep chemicals used for preparing the inside of a tank for "Kreem" works though.
Just thought I would pass this along. Can't fight what you don't understand, right? :-}
It seems that ethanol reacts to oxygen, and the resultant residue is the byproduct of the breakdown of the ethanol. It begins in around 90 days of sitting in the tank untreated. It sticks to the insides of the tank and then flakes off, in the consistency of talcum powder, and will go through regular fuel filters like they weren't there. To catch it requires a 10 micron or smaller filter. It loads up beneath the pilot jets and makes it nearly impossible to "dial in" the carbs to idle right. "Kreem" can help immediately to seal it off, but if ethanol fuel is left sitting in there untreated it will foul that too. It does come off the inside of the tank when the tank is "banged", much heavier, making people think it is surface rust knocked loose. Two solutions I have found;
Buy non-ehtanol fuel(fat chance here in the US, They actually want to pass laws to make the content 20% instead or the present 10-15%).
or;
TREAT the fuel with additives sold everywhere.
Otherwise you will just have to ride hard and a lot so the fuel never gets old! ;-} I know, a third, sorry but I just had to put that in since it is my personal solution.
I bought a PAIR of GS850G's for 460 bucks and found this stuff in them. The first one I got running (and put 8K miles on in the first 7 months I had them) had this stuff under the rubber plugs that the pilot jets live under in the CV32mm carbs, and it has been one hell of a "chase" getting it cleared out!
If you have to leave the bike sit for more than a very short time, treat that fuel. Carb cleaner does not clean this stuff up either! The prep chemicals used for preparing the inside of a tank for "Kreem" works though.
Just thought I would pass this along. Can't fight what you don't understand, right? :-}
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