Hi all - I'm new here and new to chainsaw repair. I picked up an MS440 at auction today, with a 16" bar and chain, and spent the afternoon disassembling and cleaning. I will be using it to get firewood and possibly for some milling, but I know that's a whole other topic for another day.
My first question is whether this sprocket is shot, or if I can run it. The first photo is the front of the sprocket. The needle cage seems to have melted away, leaving the pins. I will get a new needle cage.
I hope the second photo is clear enough to show the worn holes.
Can I just flip the sprocket and run it so that the chain runs agains the unworn end of the openings in the sprocket?
Holy ****, looking at the photos, it looks like a couple of teeth have sheared off the sprocket. Wow. I'd tear into it again but it's dark now and I put everything away.
Could the original problem have been this spring breaking (#13)? It's behind the clutch. I forgot to take a photo - the bent end is broken off.
The two plastic covers around the clutch show a lot of heat damage.
I can't seem to get it to idle without the chain moving. If I turn the idle screw down to stop the chain, it stalls. Am I going in the right direction diagnostically? Compression is 163psi. Spark plug was coated in white. A wire wheel made it look new.
Piston looks great - no scoring - horizontal fine lines.
Thanks for your patience with my rambling thoughts. Any assistance is appreciated.
Will
My first question is whether this sprocket is shot, or if I can run it. The first photo is the front of the sprocket. The needle cage seems to have melted away, leaving the pins. I will get a new needle cage.
I hope the second photo is clear enough to show the worn holes.
Can I just flip the sprocket and run it so that the chain runs agains the unworn end of the openings in the sprocket?
Holy ****, looking at the photos, it looks like a couple of teeth have sheared off the sprocket. Wow. I'd tear into it again but it's dark now and I put everything away.
Could the original problem have been this spring breaking (#13)? It's behind the clutch. I forgot to take a photo - the bent end is broken off.
The two plastic covers around the clutch show a lot of heat damage.
I can't seem to get it to idle without the chain moving. If I turn the idle screw down to stop the chain, it stalls. Am I going in the right direction diagnostically? Compression is 163psi. Spark plug was coated in white. A wire wheel made it look new.
Piston looks great - no scoring - horizontal fine lines.
Thanks for your patience with my rambling thoughts. Any assistance is appreciated.
Will