tacomatrd98
ArboristSite Guru
I've been fiddling around with this in my spare time for awhile and finally got it to what should be a functional point. I've always thought it would be cool to have a pleated "HD" style filter on a 026/260 so I set out to do just that. Figured while I'm at it, may as well stuff an 044 carb in there too.
At this point it is just a tank, I don't have the motor done yet to be able to run it. Put new bearings, seals etc in, but don't have the jug ported yet. This saw is a parts bin saw from my stash of junked 026/260's. Time is limited these days and I couldn't wait any longer to share my craziness.
The carb is a Zama C3M off an 044. The white filter base is a modified Echo CS400 part. The air filter is CS400, unmodified. The nut/knob is an OEM stihl air filter nut from a 460. The rear sealing plate is just alum. sheet I cut into a circle and drilled for the knob. The aluminum plate that adapts the carb to this filter base is custom made from 3/8' thick aluminum. I countersunk the holes on the carb studs so the plate is what holds the carb tight, then drilled and tapped 3 holes for the filter base to fasten tight to the adapter plate. One thing I wanted was to retain the factory master control lever. For this I made an arm that attaches over the stock choke flipper and will activate the carb mounted choke in the 044 carb. It took some tweaking to get this just right to allow the arm to still go to the off position yet fully open the choke and work in the 1/2 throttle position. Probably made and scrapped about 5 of these little guys till I got it just right. It does not need to be bent at a 90 like in the pics to work with this filter setup, however I made it that way so it WILL 100% work with a stock filter and cover. To run the stock filter you have to swap out the carb studs and remove the choke flap and seal off the choke arm hole in the filter. I did this incase this setup blows and I decide to just run the stock filter on the 044 carb. It doesn't look the best right now but this is my prototype setup. Eventually going to get a machinist friend of mine to remake all the parts with real machine tools and smooth up everything. I did everything except tapping the holes with a burr in a die grinder, hacksaw, file and a drill.
One thing that made this a major PITA to get all lined up is the offset carb housing on a 260. I never realized they are not symmetrical. Not a big deal, but I wanted the filter to end up centered, and it didn't quite work out that way. I'm working on a custom 2 piece cover like an 044 uses to run on an 026 that I'm building along side this one. I cut the back half out of a stock filter cover and am making a small version of an 044 type back cover. I have not gotten it ironed out yet. I'm getting closer, but it isn't picture worthy yet lol.
As far as fitting the carb, I will be using an 038 intake boot, 026 clamp and boring the tank slightly to fit the boot. To actually get the carb in the tank, I only had to drill one hole for the idle screw and shorten and re-grooved all three adjustment screws. I also removed the grommet on the LH side of the carb box as it made the throttle shaft drag a bit. I shortened the fuel inlet and re-positioned it and it seems like it will work just fine. I also had to shorten the horizontal portion of the choke arm a tad as well.
Let me know what you guys think.
At this point it is just a tank, I don't have the motor done yet to be able to run it. Put new bearings, seals etc in, but don't have the jug ported yet. This saw is a parts bin saw from my stash of junked 026/260's. Time is limited these days and I couldn't wait any longer to share my craziness.
The carb is a Zama C3M off an 044. The white filter base is a modified Echo CS400 part. The air filter is CS400, unmodified. The nut/knob is an OEM stihl air filter nut from a 460. The rear sealing plate is just alum. sheet I cut into a circle and drilled for the knob. The aluminum plate that adapts the carb to this filter base is custom made from 3/8' thick aluminum. I countersunk the holes on the carb studs so the plate is what holds the carb tight, then drilled and tapped 3 holes for the filter base to fasten tight to the adapter plate. One thing I wanted was to retain the factory master control lever. For this I made an arm that attaches over the stock choke flipper and will activate the carb mounted choke in the 044 carb. It took some tweaking to get this just right to allow the arm to still go to the off position yet fully open the choke and work in the 1/2 throttle position. Probably made and scrapped about 5 of these little guys till I got it just right. It does not need to be bent at a 90 like in the pics to work with this filter setup, however I made it that way so it WILL 100% work with a stock filter and cover. To run the stock filter you have to swap out the carb studs and remove the choke flap and seal off the choke arm hole in the filter. I did this incase this setup blows and I decide to just run the stock filter on the 044 carb. It doesn't look the best right now but this is my prototype setup. Eventually going to get a machinist friend of mine to remake all the parts with real machine tools and smooth up everything. I did everything except tapping the holes with a burr in a die grinder, hacksaw, file and a drill.
One thing that made this a major PITA to get all lined up is the offset carb housing on a 260. I never realized they are not symmetrical. Not a big deal, but I wanted the filter to end up centered, and it didn't quite work out that way. I'm working on a custom 2 piece cover like an 044 uses to run on an 026 that I'm building along side this one. I cut the back half out of a stock filter cover and am making a small version of an 044 type back cover. I have not gotten it ironed out yet. I'm getting closer, but it isn't picture worthy yet lol.
As far as fitting the carb, I will be using an 038 intake boot, 026 clamp and boring the tank slightly to fit the boot. To actually get the carb in the tank, I only had to drill one hole for the idle screw and shorten and re-grooved all three adjustment screws. I also removed the grommet on the LH side of the carb box as it made the throttle shaft drag a bit. I shortened the fuel inlet and re-positioned it and it seems like it will work just fine. I also had to shorten the horizontal portion of the choke arm a tad as well.
Let me know what you guys think.
. I originally wanted to keep it under the stock filter cover but this was as close as I could get for now. This is my first attempt at this. I want to run the saw with it to see how it behaves before I spend too much more time on a 2 piece cover version which I hoping to make look like a little 044/064 HD filter cover.
