Problem: 1) Chain saws with two-stroke oil mixed gasoline ignites very badly after 8 weeks. Saws run round, go out, are warm bad don’t start. 2) Power generator (2kw electric) runs badly with 8 week old petrol. Speed fluctuations, bad cold start, bad warm start, no full generator power. 3) Motorcycle. Jumps badly. Misfires. Stand gas speed up and down. 4) Auto Golf 2. Bad cold start. Unround engine run with cold engine. Engine dies off, when taking away gas. Problems do not occur with 4 week old petrol. You don’t dare to fill up. So there was no such thing with petrol normally lead-free, 91 octane. Chain saws with special fuel 2 cycles from’m Obi. Saws run like Sau. Standgas top. How can this problem be solved?