Motorproblems on Stihl MS 250 C

[MartDalb]

Thanks. I will try that tomorrow. It's midnight here now

We are on the same timezone, and yes...sleep is needed!
good luck and keep us posted

 

[Penge58]

I need the chain saw pretty soon so I might just buy a new one and use the old one as my hobby project.
Anyway I have learned a lot about chain saws by this and I will not give up

 

[Penge58]

I need the chain saw pretty soon so I might just buy a new one and use the old one as my hobby project.
Anyway I have learned a lot about chain saws by this and I will not give up

I will my Danish friend.

Good night.

 

[MartDalb]

Godnat til dig også!
Well....having 2 saws is almost a must anyhow is it not?

 

[PV Hiker]

Disconnect the impulse line and put a dab of oil on the end. While moving the flywheel around the oil will move in and out of the line

This is also a way to see if the piston is working. Can use a pressure/vaccum gauge and watch the needle move

 

[SEAM]

Try a different (working) carb!
https://www.arboristsite.com/community/threads/ms-250-carb.309871/

 

[Penge58]

Try a different (working) carb!
https://www.arboristsite.com/community/threads/ms-250-carb.309871/

The one I have and want to replace is ZAMA

 

[Penge58]

This would be my choice, I trust CTS carb, have been using their parts for a while now.
Just for future projects

https://www.amazon.de/Vergaser-021-...placementKeywords=stihl+ms250+vergaser&sr=8-1

Hello MartDalb

I have recieved the carburettor now but unfortunately it is a wrong type.
However it seems to be excactly the same as the one you recommended and you linked to at Amazone.

The major difference is that there is one nipple missing on the new one compared to the old and the distance between L and H adjustment is different from the old one so that the holes in the orange cover will not match the carburettor.

Below I have pictured the two carburettors. The new one is to the left. Old to the right. (new one has yellow endstopper on H)

 

[HarleyT]

You have a model with a primer/purge bulb.

 

[HarleyT]

1123 120 0617 or
1123 120 0602

 

[HarleyT]

But look at the pic, if they have put one up. What is available in your country, I don't know.
But make sure you count 2 nipples...

 

[MartDalb]

aw damn, that really sux!


I just assumed you had compared the carburator you had and the one you bought.

I can't seem to find any cheap alternatives to the 250C carburator right now, only the model without nipple for the bulb. Ill look around the places I know....

Just to make sure, you mean the "old" zama carburator is the one with the yellow endstop, right?

 

[SteveSr]

aw damn, that really sux!


I just assumed you had compared the carburator you had and the one you bought.

I can't seem to find any cheap alternatives to the 250C carburator right now, only the model without nipple for the bulb. Ill look around the places I know....

Just to make sure, you mean the "old" zama carburator is the one with the yellow endstop, right?

The new carb that you bought will still work enough to test the saw. However, the carb screw boot won't fit and obviously you won't have the purge bulb functionality.

 

[Penge58]

aw damn, that really sux!


I just assumed you had compared the carburator you had and the one you bought.

I can't seem to find any cheap alternatives to the 250C carburator right now, only the model without nipple for the bulb. Ill look around the places I know....

Just to make sure, you mean the "old" zama carburator is the one with the yellow endstop, right?

Yes that is right.
I have found carb for the niøb version but its pretty exåensive-
I will keep looking.

 

[SEAM]

I prefer the single nippled Walbro over the twin nippled Zama - the primer circuit could actually the or a secondary cause of the problem...

 

[DND 9000]

@Penge58
Please read this carefully and answer this. I have to quote myself:

If someone has a question to a problem with his chainsaw or other machine, everyone who would like to have help should be so kind to give right informations about the current situation. That means descriping the problem in detail and importand which machine or model it is, also if possible year of manufacture, serial number and if it is a carb problem, please tell what your current carb is. (exact model description)

With all these informations it is much easier to help and does not take a lot of time for searching information. Thank you.

 

[MartDalb]

Testing it with that single "nipple" carb is actually not a bad idea...
I might be mistaken, but the only issue should be making sure the "tank vent" is fixed into a hose that fits the vent "nipple" or hole whatever the saw has, and not the "T" piece that splits the hoses to the primerbulb etc. It has been a while since my last 250c but...I pretty sure its doable as SteveSr mentioned.

It's worth considering before spending more money on the saw.

My money is still on that prebuild aftermarket engine, but I hope I am wrong.

Good luck Penge58!! keep us updated

 

[MartDalb]

I was bored and tried to draw it....hope it makes sense

Red dont use, green use....connects to the green circle left (nipple or hole) side of drawing

 

[Yukon Stihl]

I don't need to circle these in purple,
oddly......

View attachment 836771

Arn't those nipples connected to pull start?

 

[Yukon Stihl]

I will get a new gasket tomorrow.
The Stihl dealer and service centre is just 5 minutes walk from here
I will clean the nipple and carb carefully with compressed air and go through all the hoses.

I will let you know how that goes.

Thank you so far

Petter

Don't use compressed air on your carburator,you can destroy sensitive check valves