Finally don't hate my Stihl weedwhacker - Snowblower Forum : Snow Blower Forums
 
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post #1 of 10 Old 08-16-2015, 10:54 AM Thread Starter
wdb
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Finally don't hate my Stihl weedwhacker

I have a Stihl weedwhacker. I bought it to replace an ancient Craftsman that needed more in repairs than I was willing to spend on it. It has always been 'touchy' to start when cold, and worse after it has been running for a while - for example after I refuel it. Well, on Friday it simply stopped cooperating at all; after refueling it simply refused to start. At all. Nothing I did worked. I pulled for 15 minutes, wore myself out. No luck.

After a break (and a lot of blue language) I got to thinking, this is a simple machine. There has to be something very fundamental wrong. So I pulled the plug again, it was still dry. I popped the air cleaner cover and it was not clogged or dirty looking. (I had not done this earlier because the machine is almost new.) But, hmmmm, the air cleaner is made of very dense wool felt; what would happen if I left it out? Vroom! The machine started on the very first pull. So okay, maybe the filter really is dirty even though it does not look it. I dunked it in gas, squished it around. Nope, it really wasn't dirty. Maybe too much oil; the gas dunk should have taken care of that. Put it back in, pullpullpull, nada. Take it out again. Vroom.

I ended up cutting a piece of foam rubber to the right shape, oiling it, and putting it in the air cleaner chamber. The machine fires right up every time. I can't understand why Stihl would put an air filter in that is so dense the engine is being choked for air when trying to start. Makes no sense to me.

Last edited by wdb; 08-16-2015 at 10:56 AM.
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post #2 of 10 Old 08-16-2015, 01:12 PM
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Interesting.

After 15 years of dragg'n extension cords around, this summer I "treated" myself to a Stihl Leaf blower. So far so good. Fires right up and runs like a champ. Only problem I have is I should have made the purchase Looong ago. Man it that handy to have.

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post #3 of 10 Old 08-16-2015, 04:46 PM
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How old is the Stihl weedwacker? I just bought a Stihl FS 56 RC a month ago, and it fires right up!

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post #4 of 10 Old 08-16-2015, 07:54 PM
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Quote:
Originally Posted by liftoff1967 View Post
Interesting.

After 15 years of dragg'n extension cords around, this summer I "treated" myself to a Stihl Leaf blower. So far so good. Fires right up and runs like a champ. Only problem I have is I should have made the purchase Looong ago. Man it that handy to have.
When I was working at the school??? I used to use the leaf blower for 1 or 2 in. of light dry snow works great

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post #5 of 10 Old 08-16-2015, 08:15 PM
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thats odd i love my stihl fs38, always start within a few pulls and have never had any fuel system woes
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post #6 of 10 Old 08-17-2015, 01:56 PM Thread Starter
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It's pretty new, 2 or 3 years old and used very lightly. I weed whack twice a year. I hate the job.

Do any of you use the priming bulb? I've heard varying reports on its effectiveness. I don't touch mine; the one time I did, following the instruction manual, I ended up with a soggy spark plug.
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post #7 of 10 Old 08-17-2015, 02:32 PM
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i prime mine 5 times when cold. probably part of the reason it runs so badly is because you only use it twice a year
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post #8 of 10 Old 08-17-2015, 04:37 PM
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When I use 2 stroke equipment I prime it until I get a steady stream of fuel going back through the return line.

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post #9 of 10 Old 08-17-2015, 05:09 PM
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When I use 2 stroke equipment I prime it until I get a steady stream of fuel going back through the return line.
I do this as well.
edit: exception being a "2 stroke" lawnboy duraforce i had. It was like a...say a standard Tecumseh.

I don't truly know or understand how or why, but I believe the primer bulb on a typical string trimmer does something different from the typical OPE four stroke on a mower/blower/tiller. I'd be willing to learn the difference if anyone really knows what its purpose is.

edit 2
Id believe it mostly has to do with a gravity fed with the tank above float/needle, vs something that can operate with the gas tank below the carb.

Last edited by dbert; 08-17-2015 at 05:19 PM.
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post #10 of 10 Old 08-17-2015, 05:54 PM
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Yea, I am not use to having free standing 2 stroke equipment. When I think of 2 stroke I think of hand held. Forgot I had a single stage snow blower I just started using last year.

My Echo equipment calls it a purge valve instead of a primer. It doesn't actually push fuel into the engine, it just evacuates air from the carb. It has to do with the way the diaphragms pump gas. The hand held stuff has to have a fuel pump in the carb because of the fact that they can run in any orientation. That is the purpose of all those diaphragms.

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Last edited by Shryp; 08-17-2015 at 05:57 PM.
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