Jump to content

Log in or register to remove this advert

MS250, not sure whats wrong!


allard85
 Share

Recommended Posts

Hi all,

 

I have a ms250 but it aint running too good when started.

 

If its cold, when you start it, it takes a while to cough/bite, once it finally starts as soon as you give it any revs it boggs out (even if your really gentle).

 

if you get it revving and warm it up a bit, its only a matter of time (bout 30secs) when ticking over it boggs out again. And will bogg out if you give it more than half revs..

 

after it boggs it takes another 10 pulls or so to get it started again.

 

I have cleaned out the air filter and no change. Have changed the fuel and oil still no change. cleaned the clutch and yet still no change.

 

Please help me, if you have any ideas on what it could be.

I might just send it in for a survice.

 

Thanks alot guys.

Link to comment
Share on other sites

Log in or register to remove this advert

thanks for the replys guys, they are most helpful, i think i will just take it to the pros to fix i know a guy who might do it cheap for me.

 

it hasn't been used running for a while, bout 2/3 months.

 

how tricky is it to take apart and clean???

Link to comment
Share on other sites

First thing I do with most saws is to check the compression on the recoil and then with the gauge. Followed by pulling the muffler for a look at the piston. If you have 140psi+ and the piston front looks clean of scoring then there is little reason to strip it down.

 

I then Vac and pressure check the engine - this is a bit advanced and you need specialist kit to do this but on the positive side, it will tell you if you have leakage in the crankcase, impulse line and carb boot.

 

If you can't do the above then you have to use visual inspection and it is far less reliable.

 

Carbs are easy to strip down but there again I have done hundreds and know EXACTLY how they work - checking the gauze filter is pretty simple though - it is under the cover with the single retaining screw.

 

The actual engine on a MS250 is a clam style engine and IMO isn't the most easy of engines to work on as you have to pull the complete assembly out of the plastic cradle to work on the cylinder/piston. Vertically split crankcases are 1000 times easier.

 

If the above means nothing to you - give up and take it to someone who knows their craft - I do take on problem saws but if you have a local guy, try him first and ask him if he can do the above:thumbup:

Link to comment
Share on other sites

Carbs are easy to strip down but there again I have done hundreds and know EXACTLY how they work

 

That's quite a statement...:hmmmm2:

 

3 simple questions for you then, the carb is from a 1122 series Stihl;

 

-What is circled red and what is its purpose?

-What is circled blue and what is its purpose?

-Is the idle system dependent or independent of the main jet system?

Carb.jpg.f06adfbfb64b9a0c658607135f7a5bdc.jpg

Link to comment
Share on other sites

That's quite a statement...:hmmmm2:

 

3 simple questions for you then, the carb is from a 1122 series Stihl;

 

-What is circled red and what is its purpose?

-What is circled blue and what is its purpose?

-Is the idle system dependent or independent of the main jet system?

 

Not sure how this helps the guy fix his saw as the point I was making was that I can coinfidently strip and set up a carb but he may not but anyway: -

 

Blue - full load semi fixed jet for high speed running

 

Red - Part load valve jet - controls low speed running and has a built in one way valve to stop pressure changes in the carb throat effecting the fuel in the diaphragm part of the carb.

 

The carb is dependent on the main jet

 

Do I get a teddy bear/goldfish etc:lol:

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share

  •  

  • Featured Adverts

About

Arbtalk.co.uk is a hub for the arboriculture industry in the UK.  
If you're just starting out and you need business, equipment, tech or training support you're in the right place.  If you've done it, made it, got a van load of oily t-shirts and have decided to give something back by sharing your knowledge or wisdom,  then you're welcome too.
If you would like to contribute to making this industry more effective and safe then welcome.
Just like a living tree, it'll always be a work in progress.
Please have a look around, sign up, share and contribute the best you have.

See you inside.

The Arbtalk Team

Follow us

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.