Bieber
ArboristSite Operative
Hey folks!
Did my first muffler mod on my MS 440.
Since I have the German muffler model I first had to drill out some
internal baffles (see photo). I then simply opened up the existing hole to 14mm x 24mm / 0.55" x 0.94". I has now a decent area of
approximately 0.51 sq".
The deflector is made of vanadium alloy steel and screwed into place
with a muffler screen behind it (german version does not have that).
When I fired it up for the first time I noticed how responsive the saw was. wow!
For adjustment I pulled both restrictor caps and opened H and L for another 150 degrees. Put them in again and went to dealer to have i tuned with a tach. I tuned the H to only 13300rpm. The L was at approx. 3000rpm.
Today I did the first few cuts and it ripped through the wood! WAS WORTH THE MOD!
NOW HERE THE MORE IMPORTANT PART:
But I have the notion that something has to be wrong with carb setting since I got the feeling the saw becomes very hot!!!
I hope you can see that in the pictures muffler deflector and screen became colored like gold or yellow... something you see in the beginning when heating up metal.
So does it run too hot aka to lean?
Not sure cause as I said tuned it to only 13300rpm and saw is burbling good when out of wood!
Or is there something else I missed to look for or adjust?
every help/ suggestion is welcome!
thanksopcorn:
Did my first muffler mod on my MS 440.
Since I have the German muffler model I first had to drill out some
internal baffles (see photo). I then simply opened up the existing hole to 14mm x 24mm / 0.55" x 0.94". I has now a decent area of
approximately 0.51 sq".
The deflector is made of vanadium alloy steel and screwed into place
with a muffler screen behind it (german version does not have that).
When I fired it up for the first time I noticed how responsive the saw was. wow!
For adjustment I pulled both restrictor caps and opened H and L for another 150 degrees. Put them in again and went to dealer to have i tuned with a tach. I tuned the H to only 13300rpm. The L was at approx. 3000rpm.
Today I did the first few cuts and it ripped through the wood! WAS WORTH THE MOD!
NOW HERE THE MORE IMPORTANT PART:
But I have the notion that something has to be wrong with carb setting since I got the feeling the saw becomes very hot!!!
I hope you can see that in the pictures muffler deflector and screen became colored like gold or yellow... something you see in the beginning when heating up metal.
So does it run too hot aka to lean?
Not sure cause as I said tuned it to only 13300rpm and saw is burbling good when out of wood!
Or is there something else I missed to look for or adjust?
every help/ suggestion is welcome!
thanksopcorn:
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