Allowable sparks exiting muffler?

[STIHL-KID]

My friend just called me and explained that his Husky 281XP is throwing small sparks from the muffler. A few sparks sound allowable. What causes excessive sparks to exit the muffler? The saw is equipped with a spark arrestor, any maintenance on that item? Thanks

 

[fishhuntcutwood]

Dumb question, but he's sure they're not off the bar? Otherwise, his spark arrestor isn't arresting.

 

[CaseyForrest]

Arent sparks coming from the muffler just carbon from the exhaust?

 

[Lakeside53]

A real hot exhaust... So running too lean can lead to a sparking condition.

 

[STIHL-KID]

Yeah my buddy is positive about the sparks coming from the muffler. He runs Stihl oil 40:1 mix.

 

[blis]

whoa, sounds freaky, never had any sparks fly from muffler...

thou sparks flying a bit when limbing a huge spruce is common....

 

[GASoline71]

A real hot exhaust... So running too lean can lead to a sparking condition.

Which can lead to a piston melting condition.:help:

Gary

 

[RaisedByWolves]

As far as Im concerned their All allowed to come out of the exhaust, as long as they dont start a fire.





A lot of the old saws I work on will blow out copious amounts of sparks when fired up after a long nap. Sometimes even after being run for a few minutes. I think this is due to thermal shock of the excess carbon in the cylinder.




If this saw was just woke up this could be the cause.

 

[Lakeside53]

whoa, sounds freaky, never had any sparks fly from muffler...

thou sparks flying a bit when limbing a huge spruce is common....

Run your saw hard at night... You'd be amazed what sparks!

 

[smokechase II]

sparks

Has the duly elected secretary of the wildland firefighters needing more overtime from the American taxpayer committee, (WFNMOTFTATC), you bet saws throw sparks.

 

[STIHL-KID]

The saw is an older 281XP that my buddy got for his recent B-Day. I guess the previous owner stored it in the garage most of the time. Since he has gotten it, the saw has cut approximately 2 cords. He uses Stihl Oil and 92 octane with 40:1 mix ratio. The saw runs great with no probelms. The sparks emitting from the muffler is something that has recently developed. He took the muffler apart and cleaned it out. Not sure how it's performing now.