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Author Topic: Stihl Chainsaw Won't Start  (Read 406 times)

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Offline ehwirth

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Stihl Chainsaw Won't Start
« on: August 06, 2020, 12:36:34 PM »
My MS250 Stihl won't start. Spark plug makes spark but yellow, not fat and blue. Air filter is clean. Plug comes out wet with fuel so it is getting fuel. Tried a new spark plug, still nothing. Tried a little shot of fuel in the carb throat, nothing. It seems to be an ignition problem. Would the more experienced folks reading this recommend installing a new ignition module? Thanks in advance for your help. Also checked the air gap of the ignition module, it was at least .025", it was reset to .010", still nothing.

Offline realzed

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Re: Stihl Chainsaw Won't Start
« Reply #1 on: August 06, 2020, 06:01:53 PM »
Does the saw feel like it has decent compression when you pull the rope out slowly or does it just slide out without a lot of 'pulsing' or resistance between compression cycles?

Offline joe_indi

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Re: Stihl Chainsaw Won't Start
« Reply #2 on: August 06, 2020, 08:43:34 PM »
Hope you are not choking it full time because a wet plug is a sign of flooding.
Try it without choke, maybe you will need to try a few extra pulls. 
Even after that if you are getting no life out of it, first thing to check is whether the flywheel has shed its key an slipped out of position. This will change the ignition timing . To check this the 100% verifiable way is to remove the flywheel and inspect. The simpler but not too definite way is to have the plug out and turn the engine to TDC by using a suitable rod or even a blunt pencil to feel the position of the piston. When you have it in this position, examine the magnets on the flywheel. They should be smack below the ignition coil. If the magnets look as if they have moved a little bit, even a few millimetres, chances are that the flywheel has shed its key and is now in a retarded position.
But, if this inspection shows no such sign, before removing the flywheel, remove the muffler and check whether the piston is free of any seizure marks 
Joe





Offline ZeroJunk

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Re: Stihl Chainsaw Won't Start
« Reply #3 on: August 06, 2020, 09:06:22 PM »
Could be a lot of things, but most of the time with this complaint the saw is flooded.
Let it sit for a day or two with the plug out. Install the plug. Then don't choke, just leave on high idle and pull it maybe twenty times. If you have somebody to help you hold the saw then pull the throttle wide open while trying to start it. If that doesn't work then go to plan B.

Offline mooleycow

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Re: Stihl Chainsaw Won't Start
« Reply #4 on: August 07, 2020, 03:57:41 PM »
Try having someone hold the trigger tight against the frame and you hold the saw with your foot and give 3 
pulls, no start then to the shop.  You may have a compression issue.  Goo luck.

Offline Sprinter

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Re: Stihl Chainsaw Won't Start
« Reply #5 on: August 07, 2020, 08:52:28 PM »
My MS250 only gets one pull with the choke on. Second pull is with wide open throttle. Usually starts then if not second pull does it. 
I was frustrated as well with flooding. Took me a while to quit chocking but it worked.
Fred

Offline Soundsilent

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Re: Stihl Chainsaw Won't Start
« Reply #6 on: August 10, 2020, 08:23:54 PM »
The saw could be flooded.  In my hot region, an Ms250 that has sat primed a day or two will often times fire off first pull without ever having to choke it.  Also, that pop on choke can be easily missed.  Take the plug out and air out the cylinder, dry off the plug, then try again.  You should have a running saw after that.  I see many people that pull an MS250 out of a case with it already on choke.  

That saw is famous for being easily flooded.  Once you figure out it's quarks it an good saw.


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