Hi Folks
First post........ but I have been lurking for a while and decided to join up.
My 039 never really felt like I ran like it should.
It used a lot of fuel and would stall in the cut if I worked it too hard.
A bit of googling started bringing up threads here and I started looking into what could be done to improve performance.
I left the baffle alone and opened up the holes around the face of the muffler outlet.
I borrowed a tachometer from a friend and after a lot of reading and you-tubing, had a go at a carb re-tune this morning before I started to cut.
I let the saw warm up and adjusted Idle to 2700 RPM
I opened up the throttle and the saw was running at 10900 RPM. Leaned it out and brought it back to the rough till it just 4 stroked and gave me 12500 RPM
WOW....... its a different saw!
Throttle response is much better, It ran cooler, used less fuel, was not any noisier, and fell through foot thick eucalyptus like it was butter.
A nice 4 stroke burble in the cut, and no more stalling under load.
I am a happy man!
First post........ but I have been lurking for a while and decided to join up.
My 039 never really felt like I ran like it should.
It used a lot of fuel and would stall in the cut if I worked it too hard.
A bit of googling started bringing up threads here and I started looking into what could be done to improve performance.
I left the baffle alone and opened up the holes around the face of the muffler outlet.
![039 muffler mod 1.jpg 039 muffler mod 1.jpg](https://cdn.imagearchive.com/arboristsite/data/attachments/135/135304-2bed5925ce9f57add6ca4f85f7c84a9d.jpg)
![039 muffler mod 2.jpg 039 muffler mod 2.jpg](https://cdn.imagearchive.com/arboristsite/data/attachments/135/135305-e2863804fb73a978d75ff9e89e1759a2.jpg)
I borrowed a tachometer from a friend and after a lot of reading and you-tubing, had a go at a carb re-tune this morning before I started to cut.
I let the saw warm up and adjusted Idle to 2700 RPM
I opened up the throttle and the saw was running at 10900 RPM. Leaned it out and brought it back to the rough till it just 4 stroked and gave me 12500 RPM
WOW....... its a different saw!
Throttle response is much better, It ran cooler, used less fuel, was not any noisier, and fell through foot thick eucalyptus like it was butter.
A nice 4 stroke burble in the cut, and no more stalling under load.
I am a happy man!