CamMann
ArboristSite Operative
Picked up this saw for a few bucks. It's seized, everything inside the muffler, exhaust port, and exposed portion of piston is all covered in crusty white powder from corrosion. It's probably junk, but figured I'd at least pull off the top end & see how how bad things are. The handle/airbox/rear-cylinder cover are all one piece that has to come off first. Before I can take that off, I have to remove the decompression valve lever, shown under the choke. It's seized too.
Normally, how would that decompression valve/lever come out? Looks to me like if I moved the springed throttle latch out it's the way, maybe the decompression lever would just pull out? That's what I've been attempting, but so far it won't budge. So far, just been trying to get some penetrant to both ends of the valve rod, put a vice grip on the lever, and worked it back & forth, bit by bit. Got it free enough I can rotate it by hand now, but still won't come out.
Edit 1: Yep, that's how the decompression valve comes out. This one was just stuck as heck. Then to get the handle/airbox assembly off, i took off the carb, 4 bolts behind the carb, and two bolts at the bottom of the handle. Also had to disconnect some oiler lines, and temporarily remove the oiler plunger & oiler adjustment screw to free them from the handle assembly.
Getting the cylinder off does look like it'll require a significantly more in-depth teardown than most saws I've come across. Looks like about a 75% teardown of the saw will be needed to get access to all 4 cylinder fastners. Will update later with more pics of the process & whatever comes next.
Edit 2: So, after removing the handle assembly, I removed the flywheel & ignition assembly. Then the clutch, drum, & clutch-side of the saw had to come off to give access to one of the cylinder's fastners. That was part of the crankcase... pretty annoying having to open that up to access a cylinder bolt, but was 100% necessary.
Normally, how would that decompression valve/lever come out? Looks to me like if I moved the springed throttle latch out it's the way, maybe the decompression lever would just pull out? That's what I've been attempting, but so far it won't budge. So far, just been trying to get some penetrant to both ends of the valve rod, put a vice grip on the lever, and worked it back & forth, bit by bit. Got it free enough I can rotate it by hand now, but still won't come out.
Edit 1: Yep, that's how the decompression valve comes out. This one was just stuck as heck. Then to get the handle/airbox assembly off, i took off the carb, 4 bolts behind the carb, and two bolts at the bottom of the handle. Also had to disconnect some oiler lines, and temporarily remove the oiler plunger & oiler adjustment screw to free them from the handle assembly.
Getting the cylinder off does look like it'll require a significantly more in-depth teardown than most saws I've come across. Looks like about a 75% teardown of the saw will be needed to get access to all 4 cylinder fastners. Will update later with more pics of the process & whatever comes next.
Edit 2: So, after removing the handle assembly, I removed the flywheel & ignition assembly. Then the clutch, drum, & clutch-side of the saw had to come off to give access to one of the cylinder's fastners. That was part of the crankcase... pretty annoying having to open that up to access a cylinder bolt, but was 100% necessary.
