>
>All,
>
>I misspoke on my last posting. I meant to say I had used avgas (100 LL)
>fuel since the beginning.....and had 300 hours on the engine when the crud
>in the carburetors began. I've since switched to mogas. I don't know
>whether one type of fuel or the other contributes more or less to crudding.
>The factory authorized Rotax repair shop here in Florida told me that carb
>crud is a fairly common problem
It's probably caused by either a yeast or a bacteria, if the engine has
stood for a long time, or indeed the fuel in the bowser has become
infected, the organism forms a sludge. 2 strokes get it in UK apparently.
So do fishing boats, they call it a virus but I think it's more likely a yeast.
RAF jet bombers used to get it in the tropics, first noticed on Canberras
in Malaysia I remember.
Graham
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