(Continued from Part 3. This concludes the article.)
Critical Replacement Parts for the Long Term
The single most common reasons small engines fail to operate at all or correctly is attributed to their fuel system that include water in the fuel, old fuel, or cracked fuel lines. And number one for chainsaw problems: old, dry and brittle fuel pump diaphragms inside the carburetor. At one time the only affordable way to correct these problems was to install a rebuild kit. However, there are other causes that make a carburetor less able to function such as fine deposits and internal corrosion. The whole replacement of the carburetor is now economically the best choice with the advent of inexpensive carburetors that come as part of comprehensive kits that may also include an assortment of a fuel filter, bar oil filter, an air filter, spark plug, replacement fuel lines, and other critical parts at price between $12 to $20 per kit. An OEM or brand-name carburetor will sell for between $50 to $75 the last time I checked and that will be the last time I do check.
New Original Equipment Manufacturer (OEM) carburetors are often sourced from the same Asian or Chinese manufacturer of these comprehensive parts kits. They typically include a complete carburetor that is also pre-tuned. I have dissembled them and the common names such as Bing and Walbro are often seen. There are three different materials used for the gaskets. The better carbs use silicone gaskets. The modern gaskets are now resistant to degradation if an ethanol blend gasoline is used. However, when modern automotive gasoline with additives evaporates, it still leaves behind a sticky or gooey residue that can plug the very small and fine passageways of these tiny carburetors.Continue reading“Chainsaws for a Decade of Service – Part 4, by Tunnel Rabbit”