Stihl chainsaw won't fire - HobbyTalk
 
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post #1 of 12 (permalink) Old 07-24-2008, 09:14 PM Thread Starter
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Question Stihl chainsaw won't fire

I have a Stihl chainsaw that has only about 10-15 hours of running time on it. It had been sitting in my garage for about a year and a half with old fuel. I should haven't keep the fuel in it but replaced it with a new mixture, checked the fuel filter and it was clean, and it refuses to fire. I replaced the plug in spite of the fact that the original looked ok and showed spark and it still won't start or even give an indication of firing. I then put about a tablespoon of gas in the cylinder without any hint of firing. There isn't any physical damage to it and it feels like it has good compression. The last time I did use it starting was effortless and now nothing. I'm not a small engine genius but two cycle engines aren't that complicated. Does anyone have a suggestion?

Last edited by mjw2025; 07-24-2008 at 10:36 PM.
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post #2 of 12 (permalink) Old 07-24-2008, 10:02 PM
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What model chainsaw do you have??
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post #3 of 12 (permalink) Old 07-24-2008, 10:18 PM Thread Starter
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It's a MS290 "Farm Boss".
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post #4 of 12 (permalink) Old 07-26-2008, 11:17 AM
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check for loose case/cyl bolts or a sheered flywheel key.
is the plug wet?

if you bought it new, or transfered the warrenty, & it's under a year old (homeowner use) it is under warrenty, (gummed up carbs are not covered)

--Lucky

Last edited by luckyvision; 07-26-2008 at 11:19 AM.
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post #5 of 12 (permalink) Old 07-26-2008, 01:31 PM
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Its possible you flooded your engine with the tablespoon of gas u put in the cylinder. Let it sit for awhile with the plug removed to dry out the cylinder. Also a good idea to replace the spark plug while your at it.
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post #6 of 12 (permalink) Old 07-26-2008, 08:58 PM
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yeah, a shot of carb cleaner in the carb or plug hole is usually sufficent to get it to kick...
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post #7 of 12 (permalink) Old 07-27-2008, 11:24 AM Thread Starter
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Although it's about three years old, operationally it's almost new as I have relatively few hours of running time. The last time I used it starting was similar to when it was brand new so I don't think it's something such as the flywheel key. My thoughts, as suggested here, is that I'm flooding it so I'm going to give the techniques suggested her a try. One suggestion was shot of carb cleaner in the cylinder or carb and my question is if carb cleaner is similar to starting fluid? The reason I ask it that I've read that starting fluid can be pretty hard on the engine.
Thanks

Last edited by mjw2025; 07-27-2008 at 07:05 PM.
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post #8 of 12 (permalink) Old 07-30-2008, 10:23 AM
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starting fluid is straight either & will wash the oils off the cyl walls, carb cleaner contains oils & won't harm the cyl as long as you don't 'run' the machine off it.
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post #9 of 12 (permalink) Old 08-11-2008, 03:08 PM Thread Starter
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I finally got around to trying your suggestion and it worked.
Thanks
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post #10 of 12 (permalink) Old 08-11-2008, 03:16 PM
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Quote:
Originally Posted by mjw2025 View Post
I finally got around to trying your suggestion and it worked.
Thanks
so what was it ??
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post #11 of 12 (permalink) Old 08-11-2008, 04:14 PM Thread Starter
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It was squirting carb cleaner into the cylinder. My response was directed to Luckyvision, who suggested it, but I forgot to specify. I appreciated everyone else's help too.
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post #12 of 12 (permalink) Old 08-11-2008, 04:15 PM
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It was squirting carb cleaner into the cylinder. My response was directed to Luckyvision, who suggested it, but I forgot to specify. I appreciated everyone else's help too.
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