So You Own A...Stihl FS 91R String Trimmer 

My season is 365 days a year 🌴😉🙂. Owned fs91r a little over a year. I run mine in a tropical climate 6 days a week minimum 3 hours each day...best machine in the world!!! Good video✌️🌴🤙

I keep coming back to these i can't thank you enough

Just bought one of these. Fantastic video of the basics to get you started. Thanks for sharing your knowledge and experience.

Just bought one of these last week for my lawn business to run alongside my 94r I love them both. 91r has great power for the size and the extra weight doesn't seem to be an issue

Just bought mine yesterday. Love it so far

Love the newer 26-2 heads for reloading. Genius way of reloading, love it!!!!!

You deserve a raise, great video! Shout out to Jeremy Farr in South Dakotah(licensed Stihl Mechanic)who convinced me to buy the fs91r, bg96, and two chainsaws. Fa'afetai Telelava Neil's Ace Home Center in Am. Samoa for carrying Stihl Products!

Another great video, keep up the great work Josh!

Just bought this model, love it

Excellent video. I appreciate your easy to follow presentation. Your verbal skills are engaging

Appreciate your time

I just bought my first one today and I can't wait to try it.

great demo my friend. i love stihl products.

Awesome video, you're a wealth of knowledge. Cheers

Yup I love mine !

Very nice video. Thank you. I am repairing 2 of these that are owned by my neighbor. "They don't run worth a XXXX!" PROBLEM: He leaves them on his trailer and they get rained on. A lot. Less than 2 years old and every part that can rust, has rusted. Yes, the air filters were soaked with water and indeed, they were growing MOLD. I have NEVER seen that before. I cleaned them up and replaced air filters. Absolutely awesome machines. I wish the idiot would take care of his equipment. -- North Central Florida

Great video thanks for sharing

I have had an FS91r for years, usually using the string head and the metal blade (when its wet enough out to not worry about fires). I have a polycut head for it that has some german writing on it and in english it says "Grassbuster". Its been a while since I've used it, and I can't find the manual for the head. I went to put new stihl polycut blades on it and it is nothing like any of the videos I can find. Every video I see for similar heads on a Stihl just have the polycut blades sitting very loosely on the bolt. My old polycut blades that are still in the grassbuster head have metal bushings pressed into them; the bolt goes through the lower half of the head, then through the bushing in the blade, then there is a "threaded washer" on the bolt, and finally it goes into the retained nuts on the upper half of the head. So I had to tap the bushings out of the old blades using a large socket underneath and a smaller socket on top. Of course the bushings won't press into the new blades easily. I tried tapping them in but they are impossible to get in. So I was able to get the bushings seated into the new blades by assembling everything in the right order and tightening the head together which got the bushings seated in. I then had to take the head apart, and tap each bushing in further with a hammer. Now when I put it together, the threaded washers can thread all the way down the bolt until they drop off the threads and just float on the bolt shaft next to the bushing/blade. I am not going to spin this thing up with these washers rattling around loose on the bolts inside the head. Why did a Stihl dealer sell me this head which makes replacing polycuts nearly impossible when every head I see online, you just open the head up and drop new blades onto the bolts?

Nice video guys!

Thanks Carl

Great video n very informative! 5-14-23

I got mine 4 years ago. I find it great, I have 2.5 ac. To cut for the stuff that gets around 2 feet tall i put on my grass blade and use it like a bushhog. I have never had an issue and run it full speed 98% of the time. I don't really know what you guys are talking about rev limitter

I just ordered my, I hope 🤞🏽 I can get couple off years out of my FS91R😌.

Love mine

I'm in Florida and do year round trimming and trimming and trimming...

Fantastic content 👌 👏 👍

Good video. Just bought one of these with the larger handles and three bladed cutting head. The shop didn't ha e the correct (25-2) autocut head but I used instead a 36-2 head. Seems okay but probably not as light and responsive as it could otherwise be. I hope my choice of head isn't going to cause any other issues.

great video I have the older modle form the FS 91 R witch is the FS 90 R

Remember too all 4 mix carburetors have a accelerator pump so never hold the throttle open or pump the trigger you will flood the engine 😁

Thank you for being clear, informative and fun about it

I could be wrong, but I thought the 91r was a 4 stroke machine? Great video btw!!

My number one question, do i need to gress the gear box straight out of the box..

great video

so the fs91r vs the km91r... are they they same specs other than the km being a kombi unit?

Exactly what I wanted to know about the vibration sleeve. That thing is annoying

Do you adjust the valves

Great info and video. Could you do a video on the fs 91 bike handle version? We just purchased one for our property

Great video!!! I just bought one of these and used it for the first time today. However, there was a problem. The bump head would not let any more line out. So, I removed the cover and discovered that the line was overlapping itself on each spool, preventing any line from being released. It appeared to be intentionally done by the manufacturer.

Oh yeah...by the way, I can wear down a plastic bump head in about month and a half. It is impossible at some of the places I cut to avoid running it over buried/partially exposed lava rocks/boulders down to the small lava cinder bits. The metal disc that you load two strings manually is the best for longevity, but not speed🙄. The brush blade is BAAAAD to the BONE!! Can't work without Stihl Products!!!

Those the air filter on the 91 same as the 111 yes or no plz reply

I have that same unit, and i always use 93 octane gas with Stihl HP ultra oil. Is okay to use .105 line??

Those little bottles I got say they make 2 gallons. They look like the same ones you’ve got.

Can you feather the trigger on the FS91 like you can on the FS94? In the past, the 4 mix units were all of nothing. Sometimes, you just need a small amount of power such as when you're around flowerbeds. I'm trying to decided between the FS94 or FS91. Thanks

What is the largest diameter line you can run on the factory head

Can we add attachments to ours (pruner, brush cutter etc) ?

What’s the purpose of the black plastic sleeve betwixt the grip and throttle? I want to remove mine to gain more adjustment out of the handle.

Nice video buddy l love mine can you really tell a weight difference between the 91 111 and the 131 l can't maybe put them on a scale l also have a 111rx but it seems to have less torque and more rpm because of the different gear box l might get a 131 for the torque 😊😊 thanks Harry Erhart Landscaping

Troubleshooting it is tough.

Two pumps passed the full primer bulb.

I bought one almost 2 years ago and I can't get it to start

Cooll little can

I’ll just buy the battery one.

What is the shelf life of an unopened can?

They wont hold up due to cam failure,crank seals, piston freezing up, lubricant system failure! Get the 250r or their fs 56 ,had 3 engine go bad

Can I add a brush cutter to this? Thanks.

Got a question for ya will that weedeater run all gear box attachments.

The handle was not made correctly. You have a hard time tightening the handle into position because the "loop" blocks the screws. Further, the nuts holding the screws are square when they should have been hex locking nuts. Design oversight that even I can see.

Motomix at $63 per gal... not likely!

What?! Four stroke? I've been out of the game too long 🤣

What's the cost

I thought aircraft has lead free no ethenol in aircraft has faa forbids ethenol and faa requires dedacated trailer

Isn't it a four stroke?

At the first of the video you said it was a 2 stroke then halfway through you said it was 4 stroke...?????

IMHO Lucas oil is way better than Stihl oil in Stihl products. I'm not the only one who believes this. My BR600 blower and FS 91 trimmer have more HP when using other than Stihl oil.

Buy a two stroke...i have two of these 91's very lil power compared to my two stroke stihls.They are 4 stroke mix lol...might be ok for a home owner with a lil neighborhood lawn...but for serious work and tall grass there a joke...your constantly listening to it blubber in the rev limiter.All mine need is a big trash can...my fault got suckered into trying the new 4 strokes...should have known better

My 91 is very unreliable

You lost me at two cycle!!!

Stihl 2 cycle oil is the stinkiest stuff ever. I use off brand 2 cycle oil to avoid the smell.

I bought one of these last summer. What a piece of shit 4 stroke I figured I'd try one all the stihl trimmers I used were 2 stroke. it belongs in a trashcan. What a piece of garbage you have to run it at three-quarter throttle or it just stays in the revel limiter I put the thing on craigslist and sold the piece of shit. It was gutless went and bought a 240 R two-stroke, and I'm back in business, don't waste your money with this piece of shit