First start with major oil leakage
What engine did you order the kit for?
The entire world doesn't use ethanol in what was once referred to as GAS. The KEYSTER kits have the usual gasket that will swell with our GAS. I simply don't worry and when I have one swell I put it in the sun and usually it will dry and be usable. Are you aware that some GAS comes without ethanol? You just have to find it and pay MORE for it.. ......................lm
It is for CL 77 engine, with normal gas, nothing special. It`s interesting what you are saying. I`m from Europe, I think the gas there contains some ethanol too, but if you buy a gasket for fuel, there it does not swell. At least it should not. You can buy low-quality garbage gaskets there too, though. My favorite was the petcock rubber gasket with the four holes that got swollen in half an hour and I broke down on the road. But normally if I buy something like this I take it back to the shop.
On the other hand, I noticed that the quality of the gas here in the US is much worse than anywhere in Europe. I have/had a BMW (motorbike), a SAAB, a Yamaha XS1100, and the engine of all of them rattle at high load. I think European and Japanese engines are not tuned for this kind of fuel, probably because of the higher compression. My point is, that this ethanol content may be related to the weaker quality and like you said, may be the reason for the swelling.
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