Jerky Pull Cord

[Okie]

I haven't had a chance to tear into my saw yet, but NEW, dosen't necessarily mean it's assembled or designed right.

I now see that you are not the Original poster.
This thread is 2 years old.
You might get new info if you will start a NEW post. I just happened to be subbed to the old post.

 

[stihltech]

You were told how to start it. Common issue an most every MS250. Start with the piston too low and it will jerk it out of your hand. Is it timing, is it compression, is it the recoil design. Could be all of the above. No cures. Start it with the piston near top and pull it like you mean it.
Not a saw for the weal and slow of arm.
Get an easy start.
Now, can we get back to oil

 

[TheTone]

There is an engineering reason for the hard pull of the 025 and MS250. The 021 was introduced in 1993, and the 023 the next year, followed by the 025 a year later. They had compression of about 140-150, 140-160, and 150-170 respectively. The 017 as well as the 021-025 use the SAME starter pulley (rope rotor) part #1123 195 0400, although the displacement and compression of the 025 is higher than the others. Since the moment arm is the same, the required force is highest in the 025, and it has a well deserved reputation of being much harder to pull over than other saws in its size range. I guess using a larger pulley was too much of a production change to be considered.

 

[filletboy]

We get lots of these complaints here about the MS250, 025, etc. being hard to pull. Maybe that's why Stihl five years ago brought out the EZ start device that gives you a spring assist. My 251c has it, and it works. I bought mine from its late owner whose widow sold it to me. It's the only saw I have with a mechanical assist like that. Most bigger saws assist you with a decompression valve instead.

I have stihl ms290 "hard to pull". My question is, can I replace the original start with the EZ Start system?

 

[Wood Doctor]

I have stihl ms290 "hard to pull". My question is, can I replace the original start with the EZ Start system?

Not that I know of unless somebody other than Stihl is selling it custom made. I used to upgrade 290s with 390 top ends. The 390 decompression valve solved the hard-pull problem.

 

[filletboy]

Not that I know of unless somebody other than Stihl is selling it custom made. I used to upgrade 290s with 390 top ends. The 390 decompression valve solved the hard-pull problem.

Nice
Can I send it to you for the mod ?

 

[Wood Doctor]

Nice
Can I send it to you for the mod ?

I am no longer doing out-of-state servicing that requires shipping, packaging, handling, etc.. I truly apologize but I cannot control aging. Time took over. There are several top mechanics here who can reply with a PM. I am sure one will. Good Luck!

 

[SteveSr]

... The 017 as well as the 021-025 use the SAME starter pulley (rope rotor) part #1123 195 0400, although the displacement and compression of the 025 is higher than the others.

FYI, The "1123" in the part number indicates that this rotor was first made for and used in the "1123" series of saws (021, 023, 025).

 

[JD Guy]

I’m a MS250 owner also. Saw has always been hard to pull over but as others have said, if you pull up to the compression stroke and hold onto the recoil handle really well it starts easier.

After the discussion above I’m curious if anyone has put a decompression valve in a 250 and is it even worth it.

I have other saws and the 250 gets used very rarely….should just go down the road I guess?

 

[Alleycat]

My MS270 always let me know it was a bigger machine than my 180, but never super hard to pull over. After a good cleaning and removing one wrap from the pull cord, it is much easier to pull. I can now start it without having to step on the handle.