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MS 250 won’t start

Matt Schmitt

Matt Schmitt

ArboristSite Operative
Joined
Mar 19, 2018
Messages
458
Age
36
Location
Indiana
Got a saw from a buddy who says his saw won’t start. Upon a quick check getting fuel/spark everything looks good. Has 128 compression, I pulled the muffler and it looks fine no marks at all on the piston. Could this saw maybe need new rings? I won’t even pop with a shot of starting fluid.
 

medalist

ArboristSite Lurker
Joined
May 6, 2020
Messages
32
Location
Hobe Sound
Mmm...even with a seal leak I'd think it would at least give a pop.
I'll assume you just pulled plug to see spark... I'd use a new plug and inline spark tester.
I've heard others complain plugs are wet easily during otherwise normally accepted starting procedures.
I guess a thought would be to examine plug after a failed start and decide your next step.
Vacuum/pressure test is in order for a more definitive diagnosis.
 
Haironyourchest

Haironyourchest

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Jun 6, 2015
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919
Location
Ireland
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The 250 is notorious for finicky starting, and easy to flood. It's choke on, pull until fire, then choke off and start. The problem is it's hard to hear or feel the first fire, and even one more pull with choke will flood. It's a feel thing, once you learn to identify the first fire, you're good.
 
NIP Group
Matt Schmitt

Matt Schmitt

ArboristSite Operative
Joined
Mar 19, 2018
Messages
458
Age
36
Location
Indiana
Copy I will try some of these to see if I can get it to go. I even put a new a/m coil on to see if I could get it to go and nothing. He’s been running stihl fuel in it so I don’t think it’s a bad gas/carb issue.
 
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