All I know is I deal with several local powersports dealers as well as marine dealers on a regular basis and they say that degraded fuel is the number one maintenance issue they encounter with small engine and power sports equipment today. Today’s gasoline can oftentimes degrade prior to being consumed in many applications. When this fuel starts to break down, it forms varnish, gums, and insoluble debris that are known to clog carburetors, fuel injectors and fuel filters, significantly affecting starting performance and drivability. Small engines and power sports equipment are typically used on an intermittent basis so fuel sits in the tank, lines, carburetors and injectors for extended periods between uses. During this time, it absorbs water, degrades and causes deposit formation. This results in starting and performance issues. Passenger cars and light trucks, on the other hand, are used more frequently, which limits the amount of time the fuel sits unused.
Now I can't say if this is part or all of your problem but if you are using fuel that is stored in gas cans in your garage or shop that has been sitting on the ground or on something in contact with the ground then I would be suspecting it might be contributing this issue by absorbing moisture. Since you just got the machine its very possible its been sitting with fuel in it for some time. It can sometimes be extremely hard to clean these systems and people tend to turn to fuel additives as a solution but many that are found on the shelves of discount stores are weak at fixing this problem in small engines, most are designed for automotive use and require up to 20 gallons of fuel to be run thru the system to see any results which is not realistic with most small engines.
Also many owners just don't care or refuse to believe fuels can cause this that they tend to ignore the issue till the machine won't run.
Last edited by Z71; 02-09-2012 at 07:43 AM.