Help Request on Stihl 028 AV Super Wood Boss - Bogging

[stihltech]

That won’t affect full throttle operation and it idles and starts well, I don’t think that’s his issue.

Oh- never say never from experience. Especially if stuck closed.

 

[cbrTodd]

What is the ID numbers on your Stihl carb?

Here are pictures of every face of the carburetor with every marking I can find. There's also a cast "M22" on the face where the needle valve sits, but I didn't take a picture of that since it's internal to the carb. I suspect that the important ones are the stampings "WT 16B B7" on the face with the fuel line barb, but I'll let you be the judge.

 

[cbrTodd]

great feedback there appreciate it.

the clutch looks very blue like it got super hot at one stage. could hit the outer flat ares with sandpaper and see if that color comes back.

i have super detailed carby manuals in PDF if you want them.

also that chain is super blunt from looking at those photos. but thats only half yr problem. the circled blue bit looks like a chamfer on the cutting edge.
that needs to go.!

I would definitely be interested in carb manuals if you have them! I'm sure that would be helpful.

I think I see what you're talking about but there's no chamfer on the top of the cutting edge. Just some dark colored gunk on top and bad lighting. It was dull though, but 5 strokes with the 3/16 file at 25 degrees on each tooth and it was back where it should be (I had to look at the chain package I keep in the case).

On the clutch, yes it had some discoloration but it came off very quickly with sandpaper. I reassembled it using the Stihl carburetor and it still ran like junk and bogged, but it made a few more chips before doing so.

So I put the 'good' rubber parts back in the Amazon carb body and tried to start / tune it and that was noticeably better than the Stihl carb. It still doesn't want to idle any more and it's got no power once it gets to full speed, but it will get there easier without load. You could even cut some with it if you were patient enough to plug along at about 1/3 the intended operating speed. I'm not that patient.

At this point I'm willing to go get a true Stihl / Walbro OEM replacement and give that a shot. So since folks are saying that what's listed in the manual may or may not be right, can you tell if it's the 1118 120 0601 from the pictures in the last post? If not, how do I find out what it is? Can the dealer tell from the saw's serial number?

 

[cbrTodd]

Oh- never say never from experience. Especially if stuck closed.

Where is this valve located? Is it in / under the brass piece at the top of the carburetor near where the W is stamped in this picture? I know I get lots of flow out of there when I spray brake cleaner in the hole for the High speed adjusting screw, but I have no idea if it's the right amount.