Well, I did it, my saw is out of warranty (by a week) - so I took the dremel to it. First, you only need a Tungsten Carbide bit (9903) no pic, I tried a different cutter at first - complete waste, one of these will do just fine.
The first pic is of the un-moded muffler with grease over the screw hole (so I didn't hit it with the tool). I also greased the whole screen and put it back in to keep the dust out of the cylinder as will as cranking the piston to the top for additional safety.
The second is the pile of shavings removed.
The third is of the opened muffler, pre clean up.
I then pulled the plug (fourth pic) - looks good I believe not burned or wet. Used an air compressor to blow air through the plug hole with the piston lowered to open the exhaust port.
The fifth pic is the result and done.
The sixth is the thin strip of rubber I use to block the H screw after removing the plastic limiter. I just jam it down the hole and against the screw to keep it from vibrating around. I have read their is no more spring to hold it in place.
The seventh and last is the Tech Tac max RPM. It shows 13161, I can't get the last two pics to load - I'll have to mess with it later.
NOTES:
I needed CCW +1/8 of a turn from where I was on this mod, I started at +1/4. The idle has to be at 3000, not the stated 2800 in the book - it tends to die too easy at the lower number. My Tech Tac is dropping the reading at WOT when left running for 2 seconds - it drops to a ?50% reading? - If you slowly increase the throttle you get a 'good' reading.
Anything scary that I have done? I'd be interested in what others have for readings when doing this mod. The saw has more 'throat' to it now - it sounds more like a saw - I'll be cutting this week. with it.
I used these instructions for setting the RPM Chainsawr Adjustment and Tuning of a Chainsaw Carburetor
View attachment 290327View attachment 290328View attachment 290329View attachment 290330View attachment 290331
The first pic is of the un-moded muffler with grease over the screw hole (so I didn't hit it with the tool). I also greased the whole screen and put it back in to keep the dust out of the cylinder as will as cranking the piston to the top for additional safety.
The second is the pile of shavings removed.
The third is of the opened muffler, pre clean up.
I then pulled the plug (fourth pic) - looks good I believe not burned or wet. Used an air compressor to blow air through the plug hole with the piston lowered to open the exhaust port.
The fifth pic is the result and done.
The sixth is the thin strip of rubber I use to block the H screw after removing the plastic limiter. I just jam it down the hole and against the screw to keep it from vibrating around. I have read their is no more spring to hold it in place.
The seventh and last is the Tech Tac max RPM. It shows 13161, I can't get the last two pics to load - I'll have to mess with it later.
NOTES:
I needed CCW +1/8 of a turn from where I was on this mod, I started at +1/4. The idle has to be at 3000, not the stated 2800 in the book - it tends to die too easy at the lower number. My Tech Tac is dropping the reading at WOT when left running for 2 seconds - it drops to a ?50% reading? - If you slowly increase the throttle you get a 'good' reading.
Anything scary that I have done? I'd be interested in what others have for readings when doing this mod. The saw has more 'throat' to it now - it sounds more like a saw - I'll be cutting this week. with it.
I used these instructions for setting the RPM Chainsawr Adjustment and Tuning of a Chainsaw Carburetor
View attachment 290327View attachment 290328View attachment 290329View attachment 290330View attachment 290331
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