sthil ms170

[hedgesparrow]

got a ms170 well son in laws been using it from new on aspen when taken hand off throttle it pops and flames comes out of exhaust first time had a brown stain. now getting used to it dealer says its the cat on the exaust doing it true or what is doing it must be excess fuel being burnt off.

[bobh]

Can't help at all but get it fired up after dark and stick up a video

[wisecobandit]

Cat in the exhaust? Never heard of one on a 170. The likelihood is it would have "kat" on the exhaust if it did?

Its certainly running rich if its spitting flames.

 

Most 170's don't have the tuneable carbs tho either to dial them in 100% so have a tendency to run on the rich side.

Not sure how aspen runs compared to normal fuel ie the same of if it runs richer but im sure Barry or Spud will prob know.

I assume the air filters pretty clean and not dirty which would make it run richer?

[raker]

The cat on your saw is a coiled object on the outer casing.I can see it getting gunked up with oil and deposits then catching light from sparks when its hot.Easy thing is to get a replacement without the cat.13 quid on ebay and it will run better without it.

[Eddie@aspen]

The cat on your saw is a coiled object on the outer casing.I can see it getting gunked up with oil and deposits then catching light from sparks when its hot.Easy thing is to get a replacement without the cat.13 quid on ebay and it will run better without it.

Hi, it's unlikely the exhaust is blocked with oil if the saw has been only run on Aspen. I would think it's over fueling. But try changing the spark plug first as I have had all sorts of strange things fixed by fitting a new plug. It is so quick and cheap to change.

 

Let me know how you get on.

 

All the best

 

Eddie

[TGB]

Cat in the exhaust? Never heard of one on a 170...

MS 170 D has a cat' fitted and they run hot, (hotter than standard MS 170).

[hedgesparrow]

MS 170 D has a cat' fitted and they run hot, (hotter than standard MS 170).

 

yes its a 170d and its new only got it last week but when flames came out i was about to chuck it and do a runner before it went bang. seems to have settled down a bit but still flames come out. will run it up when its dark and take photos of it i nicknamed it wythern as that was a dragon from wessex

[GardenKit]

Surely it must be a 171?, the 170 went years ago.

[william127]

But then it came back:thumbup:

[GardenKit]

But then it came back:thumbup:

So it did!

I must study the catalogue a bit more closely in future, as I feel a bit stupid now!