Problem with MS250

The saw has so much compression that I can't pull it though. I have had this before and removed the spark plug pulled it a few times and it worked that time but not this time. It pulls normal after I have had the plug out for the first pull.
It did appear flooded the when I pulled the plug. I'll leave it sit overnight with the plug out. Any other ideas ideas?

 

Maybe it is flooded. Very flooded you can get hydro-locked. This will feel not quite like it’s seized but very close.
If it happens again, pull the plug and flip the saw over …. See if fuel runs out the plug hole. If so, need to figure out why it’s flooding.
Maybe just a new spark plug.

 

1123 series like the 250 seem to flood more than others. We had an easy start at one time and it was quite the misnomer.

Try pulling the plug as mentioned. Double check the recoil and coil for any issues. They’re solid saws… and can cut a ton of wood before major issues develop.

You can also try pinning the throttle to clear it and burn off the flood, but it’s up to you. Most of our flooded 250s cleared easily and hot started nicely after the clear.

 

I have two of them. When one does that I hold the throttle open with it on the ground and knee/foot holding it in place to pull it all the way through.
If my filter is clogged up, one of mine will nearly break your arm when in that condition and throttle in normal start position but wide open throttle usually gets it lit off in a few pulls.
And cleaning/replacing the filter…


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My MS250 is a great saw, awesome "bang for the buck". I use it a lot and it used to be a bugger to strart on occasion but I've gotten used to how it wants to start. Get the choke off at the slightest burp of firing when cold and even if it doesn't burp, I take it down to fast idle after 4 pulls. That seems to work for mine on cold starts.

On hot or warm or even the possibility of being a little warm yet, I always try it first with no choke. Only if it won't start without choke after about 8 pulls will I put the choke back on. Then only for a couple pulls.

That usually keeps me from getting any shoulder yanks. I'm a fairly stout guy but when that saw decides to yank back... It can be nasty on my 62 year old over abused shoulder and arthritic hand...

 

New plug and saw still can't pull it through. It did pop once when on choke. Moved it to run and couldn't pull it through.
I have another saw that won't start. I will probably visit the dealers Tues.
The only saw I have left is my old Poulan and it was having problems when I retired it. It maybe time for a resurrection.

 

Time to have huskihl install another decomp?

 

Doubt it would help. That series just pulls over hard. Not sure why. Recoil pulley diameter maybe

 

Is there room on the pulley for more/longer rope? Increase the diameter/leverage a lil bit...

 

Just a thought here.
What about a mud wasp nest clogging the exhaust or spark screen?
Twice i had mud wasps plug my weed eater exhaust.

 

I’m not certain

 

How old is it? Is it still under warranty?

Chances are they will pull it and it will start and they will give you the look... If that doesn't help and you are in the north central OH area, PM me and we can get together and compare. I know I was frustrated some with mine till I got it figured out how to avoid that. It still does it sometimes anyway, but way less that before. I'm not sure if the MM helped with this or not, it's been a while but I don't think that made much difference with the shoulder bite issue. It sure did make it cut better though...

 

You guys are pretty close I do believe...

 

Sounds like a potential timing issue?

 

250’s share the same small starter pulley as the 170/180 . It’s right at the ragged edge of being too small for the 250 . So the starter system is struggling even when everything else is working perfectly . Nice saw ,but it can put up a fight to get started .

 

Even if you get the piston just past TDC before yanking on it, it still pulls hard?

 

It's not that it pulls all that hard normally. It's when it decides to kick back at the end of the pull. It reminds me of my cousin's '69 stroked and bored Sportster back in the day. It could toss you over the handlebars when kick starting that beast if you weren't extremely careful.

 

Ahh...I see...yeah I've done battle with cantankerous 500cc 2 stroke motocrossers like that...friggers would bend the arch support in work boots right now!
Keep in mind, I was working at a bike shop, so nobody brought them in unless they had already exhausted everything they knew to get it running!

 

Memories of my XT500 as a younger me. Much, much younger Sure miss that bike.