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Tool Talk Discussion Forum

Re: MS250 again

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12-16-2013 09:35:56

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Thanks, Billy. Yes, it does this on cold starts, but I haven't been able to get it to run, so it might do it on warm starts also. But, I believe that if I could get it to run, a good warm-up might solve the problem. I pulled the plug, and there was more fuel around the base than I thought there should be, but the electrode was dry. Maybe it is flooding. When I try to drop-crank with the choke off, it still won't turn the crank. It's like I'm working against compression.

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Billy NY

12-16-2013 11:57:09

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 Re: MS250 again in reply to woodbutcher, 12-16-2013 09:35:56  
That sounds odd, well for the discussion here, has to be more to this, if its straight up pulling hard like you say and can't get it to run. Well you have fuel it seems. Its odd, because typically, thats how these seem to start, most times, you'll get it to fire on full choke, mover lever, but not squeeze trigger, and like you say 1-2 pulls it is running, thats how mine is, and it will start after sitting for months, I use Stihl oil in the fuel and some startron, the latter could be snake oil, but it seems to work, I'm on the 2nd fuel line, so I'll see if using that prevented the alleged ethanol/alcohol problem with fuel line material, these do get hot enough, I have to believe over time or use, that may also dry a fuel line out and make it fracture like mine did.

I have to wonder if so much fuel is getting in its vapor locked or hydraulic locked, don't even know if that is possible, I've never heard of this on one of these saws, and if its in running condition, no problems with the piston or cylinder, that is odd, something to learn here, hopefully someone can help here that has expertise, they are not the easiest to pull over, I cannot put my foot in the handle and do it on the ground, I always start it waist high, chain brake on and bar pointed away, for me its safer and easier, my friend has the decompression on the newer MS 360, a nice feature, but mine at 64CC is still not too bad, seems the air filter plays a role in this, I always clean that with compressed air, split in half and carefully blow out the particulates, you get a lot of that from dead dry wood, vs live or trees that have moisture, chips vs straight up dust.

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12-16-2013 14:03:17

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 Re: MS250 again in reply to Billy NY, 12-16-2013 11:57:09  
I'll look for that Startron around here. I don't remember seeing it before.

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Billy NY

12-16-2013 21:41:02

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 Re: MS250 again in reply to woodbutcher, 12-16-2013 14:03:17  
I don't know if or in fact that this additive is or is not to the benefit of the fuel keeping, stihl 2 cycle oil I believe has its own additive. I run the higher octane fuel, local outfit was touting no ethanol fuel, so I'll have to check that out again, been awhile. Thing is, I rarely have any carb or fuel related problems, unless it is something that sits a for a long time, like years. Things that don't get run as much season to season, fuel seems stable, maybe not hoses and such, but the saw does sit for quite awhile summer, have not cut now since late sept/oct, 2-3 pulls it will start every time, barring any cracks in fuel or impulse lines. that took me just less than 2 hours the first time to replace, so even thats relatively easy, should go quicker the next time. Its a T-27 (torx) if I recall, will take all the screws out, get the covers off etc.

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12-16-2013 12:13:21

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 Re: MS250 again in reply to Billy NY, 12-16-2013 11:57:09  
On older well used saws it's also important to clean carbon out of the muffler (or buy a new one if it can't be disassembled) in order to maintain the right amount of resistance for fuel mixture/compression.

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12-16-2013 14:04:11

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 Re: MS250 again in reply to EricB, 12-16-2013 12:13:21  
I'll try that, thanks.

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Billy NY

12-16-2013 12:59:53

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 Re: MS250 again in reply to EricB, 12-16-2013 12:13:21  
How'd I forget that, LOL ! yes very true, I have checked mine periodically, its never been loaded up, or ever needed cleaning, but that is going to vary by user and it does not look to difficult for that to happen, it would certainly cause problems. For some of these saws in that family, there is a modification that opens up the exhaust ports, as well as adjusting the carburetor, and checking with a small engine tachometer to insure you stay within the safe rpm range, so it seems they are restricted for emissions already, unlike those built outside of the U.S or exported, supposed to make them run better and last longer.

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