Yes, you are right. Unfortunately many things have changed and today's modern engines and most of all the new legislation and ecological measures make wrinkles on the faces of the producers and place demands on the engine owners and operators or more precisely increase the maintenance requirements. The growing percentage of the bio components in the fuel is an important factor; it causes big problems to comfortable usage of small engines used for garden machinery.
Another important factor - the constantly decreasing emissions and fuel consumption standards, which forces the producers to adjust the carburettors much more finely and pour the fuel much more precisely than in the past. But these two factors are a bit in contradiction. The bio components are sticky and viscous, which is a problem for the finer adjusted carburettors. That's why higher demands are placed on the users of such small volume engines, regarding the fuel treating as well as the engine and it's fuel system maintenance and preparation. The fuel is more susceptible to going stale, therefore there can be huge problems if it is incorrectly stored and/or left in the carburettor and fuel tank over the winter. Especially if the fuel quality is lower, the carburettor gets stuck and a sticky coating is formed and makes it impossible to work. Even cleaning with ultrasound doesn't often help and it is necessary to replace the carburettor, which is a quite expensive part for most engine brands.
How to avoid this problem?
We have several recommendations for you on how to proceed if you have a small combustion engine:
- Always use fresh and quality fuel with high octane rating of 98-100 from respected fuel sellers.
- Don't make a store of the fuel in a petrol can.
- Use fuel stabilizers.
- If you are going to store the engine for longer time (more than 2 months), leave the fuel tank as well as the carburettor completely empty without any fuel.
- If you are going to use a stabilizer, on the contrary fill the fuel tank up to the edge and leave the fuel with the stabilizer in the carburettor too.
These recommendations involve most small engines. They are more then strong for engines manufactured in 2006 and after. The stabilizer can treat the fuel for up to 6 months.
We also have a recommendation for owners of the two-stroke engines:
It is necessary to use freshly mixed fuel too because today's more ecological oils for two-stroke engines are gradually dissolved by the unleaded petrols and therefore their lubricating characteristics are limited. That's why it is important to mix such a quantity of the fuel which you need and not to make needless store of it. And you won't do any harm if you add a stabilizer to the petrol.