Stihl chain saw

I have a Stihl MS250 for my primary chain saw. Saw is about 11 years old and runs perfectly, probably due to being used constantly instead of sitting. When starting on the first pull it feels like the cylinder is full of concrete. After 1 or 2 pulls it cranks easily and starts well. Anybody else experience this and what causes it? Thanks, Ellis
 
Next time you want to use it take the spark plug out first and pull it over, and se if it blows excess fuel out. There could be a buildup of fuel in the cylinder or crankcase causing this, but I would thing it would wet-foul the plug and not start.
 

I don't know but if it is a fuel block issue as Russ said, then try pulling it a time or two before pumping on the primer bulb. And experiment starting with 1 push of the bulb and going up to see what it needs to start.
 
Like Russ said, but these 1127 series stihl saws don't seem to like too much fuel when starting, flood them, wait or pull the spark plug. Have you cleaned the muffler screen ? Sometimes they get clogged up. My MS390 does not have compression release like my friends MS 361, so it and these series saws do seem to pull harder.

One of the things that I find that makes a difference is keeping the air filter cleaned regularly. It just starts easier.
So far, this has never been any trouble for me, and I don't really notice much, full choke, throttle set, 1-2 pulls it fires and if you are quick enough on the lever to click it up one notch, it will stay running, (only does this when the air filter is just cleaned and or not restricted by dust). If it just fires, it will always start after 1 pull once the lever is moved.
I'd imagine there will be a time I won't be able to handle the saw, seems a long way off, really been a good saw for the work I've done and still do.
 
Both of my Stihl saws do this, no primer bulb involved. I think it their way of getting your arms "warmed up" for the work ahead.
 
My MS250 is the same hard first pull, it has always started the same choke for 3 pulls and it sputters turn off the choke and it fires up every time. Funny it never differs no more or no less than 3 pulls on choke it will sputter and then one to start.
 
That's a sign of flooding. Filling the crankcase with gas when sitting not running.

The needle valve is not sealing off either because it is worn, damaged, getting trash under it or the metering diaphragm is getting hard from age.

If you can get parts for the carb, you can go through it, or just buy a new Stihl carb. Bought one for a Stihl blower the other day, about $45, few parts were available, would have cost about the same.
 

My 192 did the same for years even with old gas over the winter but now it takes a few more. I always store mine on the side on a rag with the fill valves up so if any chain oil leaks out below it will leak on the rag and not everywhere else.

If these things are leaking fuel into the carb past the needle valve then look at storing them chain and bar down so no fuel will get to the carb. This will also help if you have trouble with fuel leaking past the hoses where they go into the tank. I will start doing that to see if it helps.
 

Just thought of a problem with my 192 and hopefully I don't hijack this thread. I always, since I got it new, have to feather the trigger a couple times to get it to rev up before each cut otherwise it wants to stall out. Any ideas on that? thanks
 
if i remember mine did the same thing. I had a ms270. biggest piece of crap I ever had. spent so much money taking it back to dealer and getting it fixed. It finally seized up and good riddance
now I run a husky
 
BC, it sounds like it's running too lean. Does it cut OK once it's revved up? If it does, then open up the low speed, if it doesn't open up
both a little. Put some Sea-foam in it first, the small passageways in the carb probably have some varnish build up.
 

Thanks. Will try that with the seafoam and open up the low speed as it cuts great once it revs up. Usually just hold it wide open till I have to stop and move or take a break.

Wife wants a battery powered one for branch trimming. She won't use the gas saw. Followed the earlier threads on those. Just have to get to the stores to try some out since I would want one with plenty of battery power but she would want one that isn't too heavy. Thinking probably a 40v model but I would rather have one that can use all the craftsman 19.2v batteries laying around. They use to make one but apparently not now.
 
All saws do that to some extent and it is due to oil on the cylinder and piston after the fuel has evaporated away as one other poster stated. Cold weather aggivates the issue. It seems to be noticed on the 250s as they pull hard for a small saw. Assuming you have no mechanical issues two things exaggerate the issue. Excess oil in the mix and type of oil used. I use Stihl ultra but had a bit of the older orange bottle oil left and after using it my 250 acted just like yours. Went back to Ultra at 50-1 and it mostly went away.
 
I have a MS 250 as well and it pulls hard. I don't use it all the time and sitting is an issue but these have impressive compression for such a small engine. I also use the Stihl Ultra Synthetic oil.
 

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