Screw the chainsaw. Dime a dozen. I'm more interested in the amplifier.
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Screw the chainsaw. Dime a dozen. I'm more interested in the amplifier.
I stopped by local Stihl dealer today and got a 1125 120 1615 B (1/2 that attaches to carb) and 1125 120 1620 B (1/2 that faces the user. The bags did not say B, but the numbers on the parts did. Based on imperfections in casting, they came out of the same mold as my mesh filter (I'm not a mold expert, but I can't see how that can't be the case). They were out of the T-nuts but I can use the one from the old filter.
Upper left is the "user" side of the mesh filter, lower left is the user side of the Stihl 1125 120 1620 B and the lower right is 1125 120 1615 B
Above is photo of light shining through the new filter (just one half) to give some idea of the porosity.
The real issue seems to be the mating surface between the carb and filter. I'll try and post pictures of that. Anyway, the two halves combined were 14$ at the dealer, and I got a scabbard for the 18" bar on the saw for $5.99.
Upper left is the "user" side of the mesh filter, lower left is the user side of the Stihl 1125 120 1620 B and the lower right is 1125 120 1615 B
Above is photo of light shining through the new filter (just one half) to give some idea of the porosity.
The real issue seems to be the mating surface between the carb and filter. I'll try and post pictures of that. Anyway, the two halves combined were 14$ at the dealer, and I got a scabbard for the 18" bar on the saw for $5.99.
Some not great, but higher magnification photos of the air filters.
Above is the "mesh" filter (Stihl 1125 120 1600), units on the rule are in MM.
Above is "new" filter Stihl 1125 120 1615 B (1/2 that attaches to carb) and 1125 120 1620 B (1/2 that faces the user.
Above is the "mesh" filter (Stihl 1125 120 1600), units on the rule are in MM.
Above is "new" filter Stihl 1125 120 1615 B (1/2 that attaches to carb) and 1125 120 1620 B (1/2 that faces the user.
Just to complete the thread, I wanted to post some photos of the issues with the mating surfaces between the carb and air filter. I think the mesh and fiber filter I got recently come from the same mold. My guess is the mold is either getting worn out or was modified to make the same filter fit on multiple saws. Both filters as new were not making a good seal with the carburetor, and at least on my 036 the circular cut outs to accommodate the nuts holding the carb to the saw overhang the sides of carb and the inner parts of those circles are not even with the main mating surface. Basically the filter casting does not allow the filter to seal with the carb tightly. I'm guessing this was not the case when the saws first came out.
Anyway, below are some photos of the issue, and how I tried to correct it. The photos are not great and without spending a whole lot of time it's hard to fully illustrate the issue. Also thanks for the help in this tread, @Mad Professor posted some useful links in this thread, and ones I later found in older ones. I ordered one of the knock off filters on Amazon (it sort of killed me), but I am curious to see if they fixed the casting issue or just recreated the same issue.
Photo above shows the mating surface on a 123 block held up to the sun.
Photo above shows the mating surface after some truing, not perfect, but much better.
Photo above shows what seems like should be a mating surface overhanging the carb.
Anyway, below are some photos of the issue, and how I tried to correct it. The photos are not great and without spending a whole lot of time it's hard to fully illustrate the issue. Also thanks for the help in this tread, @Mad Professor posted some useful links in this thread, and ones I later found in older ones. I ordered one of the knock off filters on Amazon (it sort of killed me), but I am curious to see if they fixed the casting issue or just recreated the same issue.
Photo above shows the mating surface on a 123 block held up to the sun.
Photo above shows the mating surface after some truing, not perfect, but much better.
Photo above shows what seems like should be a mating surface overhanging the carb.
I forgot I ordered the FarmTec filter, it showed up today.
It's a clone of the Stihl filter, but they do print their name on the casting and packaging (the ethics of that are beyond this thread).
I have to admit, the clone filter does seem to fit better than the two real Stihl filters I looked at.
It's comes in a rather thick bag, I was actually surprised. They claim its equivalent to a Stihl 1125 120 1620 the Famertec part number is PJ03690.
Looks basically the same as the Stihl OEM filter.
Close up of the filter media, ruler is in mm increments (fibers look more or less like the OEM ones).
Filter to mating surface against a 123 block. Not perfectly flat, but better than the two OEM filters I looked at. See next photo, but after quickly removing a raised edge with a file the fit was much better.
One more post to follow with a photo of the mating surface
It's a clone of the Stihl filter, but they do print their name on the casting and packaging (the ethics of that are beyond this thread).
I have to admit, the clone filter does seem to fit better than the two real Stihl filters I looked at.
It's comes in a rather thick bag, I was actually surprised. They claim its equivalent to a Stihl 1125 120 1620 the Famertec part number is PJ03690.
Looks basically the same as the Stihl OEM filter.
Close up of the filter media, ruler is in mm increments (fibers look more or less like the OEM ones).
Filter to mating surface against a 123 block. Not perfectly flat, but better than the two OEM filters I looked at. See next photo, but after quickly removing a raised edge with a file the fit was much better.
One more post to follow with a photo of the mating surface
The Farmertec, although slightly better than the currently sold OEM Stihl filters suffers the same issue (at least on my saw and carb).
The description below will not make much sense unless you look at the other photos in this thread.
The red arrows are basically all on the same plane. The black arrows shows a raised ridge and the blue arrows show depressed areas (which are really just the intersection of a bevels surface cutoff by rectilinear cutout of the central large circular opening). The Stihl filters do the same thing, but the two smaller openings on either side of the main opening are higher than the central opening. If the areas with the blue arrows were at the same level as the red arrows it would seal, or if the total surface of the two smaller holes covered the carb. With all the filters the smaller holes on either side overhang the edge of the carb, so the blue arrows represent a relatively large air leak, this is compounded by the ridges shown by the black arrows.
The description below will not make much sense unless you look at the other photos in this thread.
The red arrows are basically all on the same plane. The black arrows shows a raised ridge and the blue arrows show depressed areas (which are really just the intersection of a bevels surface cutoff by rectilinear cutout of the central large circular opening). The Stihl filters do the same thing, but the two smaller openings on either side of the main opening are higher than the central opening. If the areas with the blue arrows were at the same level as the red arrows it would seal, or if the total surface of the two smaller holes covered the carb. With all the filters the smaller holes on either side overhang the edge of the carb, so the blue arrows represent a relatively large air leak, this is compounded by the ridges shown by the black arrows.
