Oh- never say never from experience. Especially if stuck closed.
Help Request on Stihl 028 AV Super Wood Boss - Bogging
- Thread starter cbrTodd
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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.
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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?
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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.
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SteveSr
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This valve is located in the main venturi nozzle. Some were rubber discs others were made out of woven fiberglass. If stuck open the saw won't idle with the correct carb settings. If stuck closed it will bog not rev up.
A WT-16 is an older pretty simple carb to troubleshoot. Main nozzle valve can be checked with your mouth and a suitable piece of tubing. However if this carb uses a rubber disc and you used compressed air on it that disc has likely left the building for the stratosphere.
Here is a Walbro service manual...
All good mate, you mentioned stuck open which would flow fuel but won’t start and idle but it was, that’s all 👍
1119 358 7700
some dumbaszz used tygon and its collapsed killing your fuel delivery, replace the fuel hose using the part # given. It can clearly be seen neing used in your video, if the impulse hose is tygon aka yellow/clear replace it with stihl hose too!!
some dumbaszz used tygon and its collapsed killing your fuel delivery, replace the fuel hose using the part # given. It can clearly be seen neing used in your video, if the impulse hose is tygon aka yellow/clear replace it with stihl hose too!!
The only Tygon hose on the saw is the vent tube. I used it to do the pressure / vacuum checks because I could thread it into the hose barb on the case, but it is not used for either the fuel supply or impulse line.
then i'd replace the ignition coil and plug if the fuel hose is good and not collapsing, cracking or the fuel filter is not clogged up.
Good lord that chain is fuked up! in a way that will result in it biting in and likely bogging down a underpowered saw. Ever try filing a chain? there are modern filing jigs sold by stihl and pferd that make it pretty idiot proof.
Take it easy on him mate, he’s learning. We’ve all been there.
Not meant as a insult! that chain, and clutch got hot! I meant it as a question, if filed incorrectly it will bite in deep and bog a under powered saw down.
That brass peace in the carb throat is the check valve for the main H feed in the carb
