Stihl 390, Bizarre Ball of Chips and Bar Oil + Carb question.

[Teewhy]

Hi Lads, I was taking apart a 390 I just got in to clean and get in shape.
I took off the Clutch cover and out fell a perfect ball of chip junk and bar oil, I have no idea how it managed to form in that little pocket, anyone else come across this before?
Here’s a video -

Stihl 390, Perfect Ball of Chips and Bar Oil


Also, I got her cleaned up and she peed fuel everywhere when I filled up and tried to start, so I checked all the lines took the filter of etc, and decided to try to start without the filter.
She started but was throwing fuel out the back of the carb while running rough. The carb was only open a 1/4 turn on both jets but a heap of fuel was spraying out the back.
I’m new to this game, what am I missing?

Cheers guys.

 

[Teewhy]

Is that the best way to link a video?

 

[hacskaroly]

Is that the best way to link a video?

Better way is to use the "media" option, click it and copy the url (web address of it) into it, it will just show "Media=youtube]IQLwsvwciiQ", but when you post the rely it will look like it does below.

 

[hacskaroly]

I have no idea how it managed to form in that little pocket, anyone else come across this before?

I have seen these before, I think it happens when you have the right amount of crud and moisture and the vibrations end up making these little crud pearls. They are easier to clean out (just tilt the saw on its side) than having to go through with a screwdriver.

 

[Ronaldo]

I’ve seen the little balls too. Kind of like a snowball, they roll around and more and more material builds up.

 

[Wilhelm]

The correct vibrations, saw dust & oil create those.

I have found them within the chain brake mechanism on my large frame Dolmar's.

 

[chiselbit]

Used to get those all the time in my 288’s

 

[Teewhy]

Better way is to use the "media" option, click it and copy the url (web address of it) into it, it will just show "Media=youtube]IQLwsvwciiQ", but when you post the rely it will look like it does below.

Ah perfect thanks, I’ll remember that.

 

[EFSM]

I've seen hundreds of these. It's amazing how perfectly round they are and how they often form in a place that is sealed fairly well (under chain brake linkage covers).

 

[EFSM]

As for the carb question, spit back is fairly severe on the 390's, partly due (I think) to their extremely restrictive muffler. They use a good carburetor that is usually very reliable, at least compared to their modern Zama's.

 

[Teewhy]

As for the carb question, spit back is fairly severe on the 390's, partly due (I think) to their extremely restrictive muffler. They use a good carburetor that is usually very reliable, at least compared to their modern Zama's.

That’s interesting, I brought the carb home to soak it in the ultra sonic cleaner in the hopes that might be part of the problem.

I suppose the clean can’t hurt, but it’s good to know it’s fairly common anyways.

Thanks for that, super helpful

 

[EFSM]

That’s interesting, I brought the carb home to soak it in the ultra sonic cleaner in the hopes that might be part of the problem.

I suppose the clean can’t hurt, but it’s good to know it’s fairly common anyways.

Thanks for that, super helpful

Of course, they can still have issues, but not usually past stiff diaphragms.

 

[HumBurner]

Better way is to use the "media" option, click it and copy the url (web address of it) into it, it will just show "Media=youtube]IQLwsvwciiQ", but when you post the rely it will look like it does below.

Deer poop

Or some other animal's poop.

 

[Woodwackr]

I have seen these before, I think it happens when you have the right amount of crud and moisture and the vibrations end up making these little crud pearls. They are easier to clean out (just tilt the saw on its side) than having to go through with a screwdriver.

Thed probably sell well on ebay.
Saw pearls