Service & Maintenance Question
I bought a 350BT blower one year ago.
I've used it...
Service & Maintenance Question posted September 22, 2016 by neil helgeson, last edited September 22, 2016
40 Views, 1 Comment
Question:
I bought a 350BT blower one year ago.
I've used it more than 20 times over the year. (Put about 2 gallons of fuel through.)
Today it just died at medium RPM. I got it restarted, and it began stumbling again and finally died and wouldn't start.
After poring through the meager manual on it, air filter, fuel filter.., I finally got to the SPARK PLUG. I wire brushed the plug and it fixed the problem.
There was a single large piece of grit shorting the electrodes. What would let a large piece of debris get into the cylinder? Could this cause scoring or cylinder or other damage.
I've used it more than 20 times over the year. (Put about 2 gallons of fuel through.)
Today it just died at medium RPM. I got it restarted, and it began stumbling again and finally died and wouldn't start.
After poring through the meager manual on it, air filter, fuel filter.., I finally got to the SPARK PLUG. I wire brushed the plug and it fixed the problem.
There was a single large piece of grit shorting the electrodes. What would let a large piece of debris get into the cylinder? Could this cause scoring or cylinder or other damage.
Photo:
Answer
Looks to be a piece of carbon. The plugs looks like the blower is running a little too rich as I would like it more greyish in color.
This carbon could built up in the cylinder broke free. As starching the cylinder yes can starch it if is hard carbon and manages to get between the cylinder wall and the piston. Soft carbon will not hurt it. Either forms of carbon is conductive especially when wet with fuel. Now I seen several cases where this has happen on Stihl trimmer but it is Stihl like to run them on the rich side in the first place. Stihl is also bad to plug up spark arresters because of this.
If was grit from external of the engine then it could only get in if the air filter is not fully in place where it could be sucked in. Any grit coming from external source has higher change of doing cylinder damage.
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