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Tractor Talk Discussion Forum

O/T- Stihl Farm Boss

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Matt Kane

12-16-2006 06:42:44




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I have an old Farm Boss Stihl chainsaw that hasn"t ran in couple of years or so. I need to clean it up and when I start it, it will idle so high the chain will spin the whole time. Does anyone know the carb settings for one of these, and which screws adjust what? I wish I knew the exact number of the saw, but I do know its a farm boss. Any other suggestions on what to check to get it tuned and going again.

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Matt Kane

12-17-2006 05:39:22




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 Re: O/T- Stihl Farm Boss in reply to Matt Kane, 12-16-2006 06:42:44  
I think I just about got er whipped. Thanks for all of the help. I found more help here than on the arborist site.



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Blue3992 (N Illinois)

12-16-2006 10:04:11




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 Re: O/T- Stihl Farm Boss in reply to Matt Kane, 12-16-2006 06:42:44  
I had a 041 that the chain would keep moving no matter how low it idled. Turned out the clutch was bad.

Go to Stihl's website below, and get a manual. They send them for free. For newer saws, you can download the manuals, but for older ones they have to mail you a copy.

And above all, be careful! Those old saws don't have a chain brake.

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Matt Kane

12-16-2006 08:23:32




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 Re: O/T- Stihl Farm Boss in reply to Matt Kane, 12-16-2006 06:42:44  
The carb was loaded with junk. I cleaned everything and put it back together. I thin its the first farm boss, its all aluminum and has the choke on top, and the throttle lock about the throttle. I'll check the gasket and I will double check my settings. On the low and high which is which, low on the bottom and high on top?



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jdemaris

12-16-2006 14:26:57




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 Re: O/T- Stihl Farm Boss in reply to Matt Kane, 12-16-2006 08:23:32  
The low-speed adjuster is the screw closest to the engine. If it's turned in too far, the saw won't accelerate properly - i.e. it will bog down when you try to rev it up - especially when cold. With the high-speed screw - it should be turned out far enough so the saw - when revved to high speed but NOT cutting wood - runs so rich it breaks up a little - but will smooth right out when cutting wood. The saw needs to run a little rich. The 3/4 turn Low and 1 turn High settings are only to be used as initial settings for a starting point for further fine tuning. In regard to the post about the clutch dragging and making the chain turn all the time. That too is common - but a totally different problem. When the clutch drags, the saw is idling at the proper speed - but the clutch is engaging anyway. That is usually caused a broken spring. The early clutches have three springs and all it takes is one to be broken and cause drag. But - if I'm reading your description properly - your saw is racing at high RPMs and will NOT idle down. That is typical of the intake-manifold and hose problem. 041s were known for shaking apart, losing screws and breaking hoses. We got so - that when we sold them new - we'd take them half-apart first and Loctite all the screws. That way they held up much better. I've still got my first 030, S10, O8S and 040 from the first Stihl dealer I worked for in the late 60s along with several 041s, 031s, 051s, and 045s from the last dealer I worked for in the 80s. I also have one 041 Super which is kind of rare. They are all very rugged saws if put together properly.

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2x4

12-17-2006 00:47:47




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 Re: O/T- Stihl Farm Boss in reply to jdemaris, 12-16-2006 14:26:57  
great collection. Got the 08s in 17" & 25" bar lengths; also with cutquik metal cutter, post-hole auger & brushcutter attachments. That was really quality stuff. Bought it in '79 0r '80 & can use any of it today. got a bunch of extra parts if you need any.



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jdemaris

12-17-2006 06:37:48




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 Re: O/T- Stihl Farm Boss in reply to 2x4, 12-17-2006 00:47:47  
08S and its predecessor, the S10 were great saws. Only problem we often had with the early 08S saws was the governor. They used a air-powered governor hooked to the carburetor choke. After a lot of use, the choke-shaft would wear out from moving back and forth so much. The choke was also the only engine shut-off - i.e. there was no electrical switch. They'd get so worn - the engine would no longer shut-off. Same with the early 040s.

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jdemaris

12-16-2006 08:04:58




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 Re: O/T- Stihl Farm Boss in reply to Matt Kane, 12-16-2006 06:42:44  
If it's the original Farm Boss, i.e. 041 - it had a persistant problem with developing a very fast high-idle and it has nothing to do with the Tillotson carb. Original 040 or 041 has a horizontal cylinder - and the air-filter cover and choke lever is on top. Same with the shut-off if it has one. The first 040s did not have a electric shut-off - the choke was used for shut-down. It's an intake and vacuum hose problem. The fiber intake manifold often gets loose and/or warped and the gaskets get sucked in where it bolts to the cylinder. Also - the carb uses an vacuum hose that connects the vacuum power fuelpump to the crankcase. To fix the manifold - remove the carb, then remove the manfold via two allen-drive bolts. If it's warped - just run it over some sandpaper. Make a new gasket - and reinstall the bolts with some Loctite. Just about every 041 Farm Boss we sold new - came back with the problem within a year. In regard to the vacuum impulse hose - just replace it with some aftermarket hose. The aftermarket hose lasts much longer than the OEM molded hose from Stihl. If you have a newer Farm Boss that is half-plastic instead of magnesium, and the the choke control and air-filter is NOT on top - than it's probably an 028 of some sort. They had similar problems - but there's no intake manifold involved. Impulse hose and intake-boot failure instead.

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IaGary

12-16-2006 07:19:57




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 Re: O/T- Stihl Farm Boss in reply to Matt Kane, 12-16-2006 06:42:44  
Matt

After choking to start it you move the choke lever to high idle then there is another notch above that for low idle after it warms up a bit.

Don't remember for sure but I think you have to hold the trottle at the same time to get it out of high idle.

Have you tried that.

They made 2 farm boss models.

Gary



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Ross

12-16-2006 07:46:34




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 Re: O/T- Stihl Farm Boss in reply to IaGary, 12-16-2006 07:19:57  
Gary I think you're thinking of the one's from the mid 80's like my 028 wood boss where the controls are all in line. My 041 farmboss just has a throttle lock on the handle and a separate choke on top. when you squeeze the throttle the lock pops off. Matt according to my 041 manual the carb settings should be:
Main H: 3/4 of a turn open
Idle adjustment(Low) 1 and 1/4 turn open.
That should be a good start for your saw.
Ross

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