ATV fuel system revitalization
The ATV
was beginning to have trouble starting from a cold stop.
I knew the previous owner
used fuel with ethanol, and it was in his garage for at least a few
weeks like that, which lead me to suspect that as the problem.
Start is a fuel system revitalizer made
by the people who make STA-BIL. It took a few days before I
started seeing results, but it seems to have improved starting.
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About us: Anna Hess and Mark Hamilton spent over a decade living self-sufficiently in the mountains of Virginia before moving north to start over from scratch in the foothills of Ohio. They've experimented with permaculture, no-till gardening, trailersteading, home-based microbusinesses and much more, writing about their adventures in both blogs and books.
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Found the MSDS sheet, Isopropanol, Butyl Methyl Ether, and Xylene as a fuel system "revitalizer." By content mostly ether carried by alcohol and xylene.
Looks like that alcohol fuel made it into your tank again.
At a guess, the isopropanol ("IPA") is used to remove water from the fuel system. The IPA mixes well in the methyl tert-butyl ether ("MTBE").
Ethers carry an oxygen atom, reducing CO during combustion. Ethers like these have a low autoignition temperature which helps to start a cold engine. MTBE autoignites at 224°C but isn't prone to form explosive peroxides in storage like diethyl ether is.
The xylene is probable mostly responsible for doing the cleaning.