STIHL FS91R Trimmer Head Won't Stop Spinning - Let's Fix It!

STIHL FS91R Weed Whacker Clutch Problems - Let's Fix It!
Problemas con el embrague STIHL FS91R: ¡arreglémoslo!
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I have easy to follow and thorough step by step tutorials "do it yourself" (DIY) videos to help you with your broken lawn and garden equipment including snowblowers and zero turn mowers.
I do my best to teach you how to easily diagnose problems the fastest, quickest and most efficient way with real repairs beyond just replacing a spark plug. These tips are for both the homeowner and shop owner.
Whether it be a handheld, two stroke, two cycle engine like a chainsaw, weed eater, weed whacker, string trimmer, grass trimmer, line trimmer, hedge trimmer, strimmer, brush cutter, leaf blower, or four stroke, four cycle units like a lawnmower, wood splitter, lawn tractor, zero turn mower, snowblower, pressure washer, generator or a ride on mower that needs parts installed or replaced, I’m your go-to guy.
My favorite brands of spark plugs are NGK and Champion and are the ones I recommend.
I’ve been a small engine mechanic for many decades and also run my own repair shop so my videos are loaded with tips and tricks that I have learned and want to share with you. You will also find many tool and product reviews from top brands on my channel as well.
I have the largest Small Engine Repair Video Library on KZbin and the entire internet with over 1200 videos, just GOOGLE "DONYBOY73"!
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Due to factors beyond the control of DONYBOY73 “The Small Engine Doctor”, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. DONYBOY73 “The Small Engine Doctor” assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. DONYBOY73 “The Small Engine Doctor” recommends safe practices when working with power tools, hand tools, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of DONYBOY73 “The Small Engine Doctor”, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not DONYBOY73 “The Small Engine Doctor".
Tengo tutoriales paso a paso fáciles de seguir y completos, videos de "hágalo usted mismo" (DIY) para ayudarlo con su equipo de jardín y césped roto, incluidos quitanieves y cortadoras de giro cero.
Hago todo lo posible para enseñarle cómo diagnosticar fácilmente problemas de la manera más rápida, rápida y eficiente con reparaciones reales más allá de simplemente reemplazar una bujía. Estos consejos son tanto para el dueño de la casa como para el dueño de la tienda.
Ya sea un motor manual de dos tiempos y dos ciclos como una motosierra, un desmalezador, un desmalezador, una cortadora de hilo, una cortadora de césped, una cortadora de hilo, una cortadora de setos, una podadora, una desbrozadora, un soplador de hojas o unidades de cuatro tiempos y cuatro ciclos como una cortadora de césped, una cortadora de leña, un tractor cortacésped, una cortadora de césped de giro cero, una sopladora de nieve, una lavadora a presión, un generador o una cortadora de césped que necesita que se instalen o reemplacen piezas, soy su persona indicada.
He sido mecánico de motores pequeños durante muchas décadas y también dirijo mi propio taller de reparación, por lo que mis videos están repletos de consejos y trucos que he aprendido y quiero compartir con ustedes. También encontrará muchas revisiones de herramientas y productos de las mejores marcas en mi canal.
#donyboy73 #howto #willitrun

[@donyboy73]

➡Watch next; Customer's STIHL FS56 Weed Whacker Is SQUEALING Like Crazy! Can It Be fixed? kzbin.info/www/bejne/kHa6f393a8-Em80

[@colinjamieson3417]

This guy is simply the best. Would love to work with him for about 6 months just so I could suss out small engines.

[@deanmoore420]

Great video, i’m 55 years old and a mechanic almost all my life. I enjoy watching your videos you do a great job keep the videos coming.👍

[@michaelspencer301]

Loved the way you left the trigger assembly altogether. That saves A LOT of extra work. Never occurred to me to do that. Great tip. Great video as always.👍👍

[@80SWoods]

I like the tip of leaving the throttle handle assembly held together with screws. I don’t know why I didn’t realize this, but every time I’ve worked on a clutch, I’ve taken the handle apart all the way and then have more work trying to get it all back together.

[@crustydownunder]

Thank you, I can now go fix my trimmer. Cheers from Australia.

[@chrishuckelberry8198]

My FS94R is doing the same thing. I plan on tearing into it now after watching the video to figure out why. Hoping it’s just the spring. Thank you

[@mopartshemi]

Honestly my customers stuff I always give the greasy areas like the carb and such a brake clean and air blow. Then wipe down the plastics the worst thing when a customer has a bad day they spend money and it looks exactly the same as they dropped it off its kinda a feel good thing for both people and most of the reactions are worth it. Also I got yelled at one time for straightening out someone's handle. Since that trimmer has no guard I often do scenarios where I go into my junk pile find a much cleaner or that missing little part and say look I'll toss this on they are normally say 30$ I'll toss it on for 20 installed. That way machines look presentable and you got added money from your junk pile. Awesome work though.

[@donyboy73]

Exactly, it's a "win win"

[@elcheapo5302]

It's amazing how much more difficult this process is on a Stihl than an Echo.

[@hdrk59]

True

[@waynestefinashen239]

Well done Donny and good move mentioning those screws did not need backing off. Honesty is the best policy and glad you were Jake's inspiration to start his channel. He has followed your lead and made his videos all about the repairs and not himself which i believe he has had so much growth. As Jake always says there is no trickery here!

[@donyboy73]

Thanks for the comment Wayne, yes no BS here and I'm glad I was able to inspire Jake!

[@deanmoore420]

I just bought a brand new Stihl weedeater just like that FS 91 great weedeater lots of power love it enjoy watching a video

[@larryleonard3922]

I know the handle didn't appear straight with the whole trimmer, I had to loosen mine and move it in a position similar to that when I first purchased it (just a personal preference for my own comfort with handling my trimmer). ALWAYS GREAT VIDEOS BUDDY!!

[@RussellBooth1977]

Yes,I have bolted a brand new Chonda engine onto my dads Honda UMK435 brush cutter attachment & I noticed this morning that the head keeps spinning at idle speed so I will need to find out what's going on with the brand new clutch assembly tonight !

[@АлексейДимаков-ч3п]

Отличная работа. Приятно смотреть как Вы диагностируете и ремонтируете.

[@donyboy73]

Спасибо!

[@t008mx]

love the close ups as your putting the clutch spring in , thank you so much for the great detail and time you put in , to make these videos

[@ninagamble9150]

Just had the same model with that issue yesterday. Thank you so much for the tutorial. Saved me much time!

[@donyboy73]

Glad it helped!

[@hickorystx]

Great tutorial with clutch repair plus all the helpful hints anad tips along the way!! 🙂

[@guowan2743]

Really enjoy your video, always clear and useful, thanks mate

[@MateuszBPM]

hi , i have a similar brushcutter . also on 4-mix engine, stihl fs 100. I like the work of these engines. Good job, regards

[@paulcastillo5235]

Hello Don. I just want to start by saying I always enjoy watching your videos on small engines and have always appreciated the way you present your videos. With my limited knowledge of small engines I learn things all the time from your videos. I enjoyed this video how to fix a Stihl trimmer that has a head that will not stop turning but I wanted to ask your opinion as to what trimmer(s) you might confidently suggest for a homeowner who regularly weeds around the yard on a weekly basis? My trimmer which is more than 15 years old is starting to give up on me so I am going to seriously start looking for a new trimmer. I really appreciate anything you could suggest. FYI, I also sent a similar comment to Chickanic and Steve's Small Engine Saloon. I really respect the opinion for all three of you.

[@johnkosheluk1041]

I am a stihl mechanic when you get the new spring on you can use anti seiz on the coller and use a screw driver to check after the spring is in

[@Francisco-sx7th]

Nice job! Very clear. Thanks.

[@trumpzilla4193]

Once again thank-you for another excellent video. I am collecting them in my small engine folder! God Bless!

[@hdrk59]

Thank you from a fan from Simcoe County.

[@johnd2174]

Brilliant videos you are very clear and easy to listen to I have recently put a new clutch and drum on my FS55c

[@AnwarKhan-dw8cj]

typical problem here in the Caribbean clutch seized on bushing have to remove and put a little loctite antiseize on the bushings and reasemble

[@donyboy73]

Salt from the ocean causes that?

[@adnacraigo6590]

I always enjoy watching your videos.

[@gregfisher216]

Great video Dony, it is possible that this was on a trailer rack out in the weather which can cause rust. This unit looks like it had been rode hard and put up wet!

[@donyboy73]

Yes absolutely!

[@deanmoore420]

Fixed a lot of them like that

[@tonypadilla6404]

I di what He did On Mine But still spinning

[@steveriggenbach90]

Great information. Thank you. Great shop. I remember when you were making the tables.

[@donyboy73]

Ahh wow, thanks for being a loyal subscriber!

[@steamboatwillie935]

My experience with string trimmers. Usually after a couple of years of usage they're pretty much trashed. Parts cost nearly as much as replacement. Buying new is sometimes more cost-effective.

[@donyboy73]

I agree!

[@ceesklumper]

Mine is now 15 years old, and still works and looks new. Stihl. Oh. except for the clutch, the head keeps spinning so now I know what to do!

[@johncitizen3927]

Break clean, maybe sand paper too..

[@lyndelllyon754]

Thanks for the update and thanks for being A great teacher

[@marcmyers1465]

Excellent 👌 Nice Direct Diagnostic ! 😉👍

[@PatrickKanatzer]

Would like to see a vid on a stihl hs56 hedge trimmer gearbox teardown and possible issues.

[@johncitizen3927]

Remove clutch cover only?

[@swingbelly]

Thanks, Dony. Yup, had the same problem recently with my FS91R. Accessed the clutch. Spring was intact but the shoes were stuck. Bought a complete new clutch from the local Stihl dealer (wasn't expensive) and installed it myself. Problem solved. An easy fix! Regards to the family. Norm, Toronto.

[@donyboy73]

Greetings from Muskoka!

[@tomfillmore9710]

Thanks buddy that was very helpful I have two trimmers and they do the same thing spin when idle have try your advice thanks great channel take care and enjoy your weekend

[@donyboy73]

You too!

[@BikeCarpenter]

Hi Donyboy, I’ve been doing some small engine work for people myself and am curious what you would charge for something like this?

[@manuelmendiaz8910]

Thanks for helping me out

[@philliphall5198]

Rust will stick any clutch system, common on really old farm tractors

[@100vg]

You mentioned putting some lube on the shoe arms, I guess at the pivot point, but I didn't see you do it. The clutch is working good now, so I guess it didn't matter. I don't have any Stihl equipment, but it's always interesting watching your repairs. I do as much for myself as I can and I always learn something from you. My Troy-Bilt Powerhead likely has something similar. It's not a all-in-one like that one, but takes attachments, of which I have a few. Thanks

[@donyboy73]

I meant clean it!

[@RussellBooth1977]

In my dads Honda GX35 powered brush cutter it was the fact that the Chonda engines clutch bolts steps just before the threads were shorter & the clutch shoes were binding on the pivot points but swapping the bolts over made no difference. I think that the original spring is a bit stretched therefore it made do difference using the original Honda bolts because I think that the clutch is still grabbing. I want to fit the original Honda clutch tonight because its spring is much tighter, the original spring is better but it won't fit because both clutch assemblies are slightly different. I would like to order an exact copy of the original clutch which is another brand of Chinese clone Honda clutch for $16 AUD including postage from China for when I decide to rebuild the old engine with a new Chonda cylinder kit !

[@garyhodder2784]

Great and informative video Donny thanks!

[@johnashton1737]

Dony. Can you please tell me what that plastic shaft 90 degrees coming off the handle is for. It seems to small to use for anything.

[@rjb6327]

Could a light sanding with some emery paper, on the clutch pad portion that slides in and out, help?

[@ukchris123]

During the video you said you were going to lube the clutch shoe pivot bolts. Is there any reason you decided not to? I saw you spray brake cleaner to clean everything but that can't act as lube can it?

[@alang.4570]

Great step by step video!

[@liljoeii6091]

Awesome Fix thank you for the video

[@MORE_BEANS_PLZ]

Hey man did you ever uploaded the video if the other thing might be the problem instead of the spring?

[@Brian_L_5168]

Hi Don, for the 2 swinging clutch shoes, if I need to put lubricant, should we use anti-seize or di-electric grease (i know this isn't electrical but i found di-electric is a super good lube to install things etc...)? Re-assemble looks way more tricky than dis-assemble, only someone at your skill can accomplish, amazing work Sir ! 👏

[@donyboy73]

Graphite lube is better, it is dry. Sometimes I just put a very thin film of anti-seize where the hinge is on shoes

[@MoparMagic360]

Good video. Just wondering where the broken piece of spring went?thnx don

[@donyboy73]

Probably flew out somewhere!

[@themowerman]

Good video don mate..

[@gravelr512]

Great video with great tips.

[@AndySelway-j4z]

Hi uk here. I got a problem with my sthil fs55 combie strimmer and advice to help please... I replaced the clutch and drum greased the shaft but before putting it on it fitted fine then fitted it to the engine and it was tight. Now when the engine is idileing the clutch spins and the drive shaft spins which I now isnt right... what is the best way to stop this happening?

[@bulldogms]

Genius.

[@irbyboy2342]

I have a stihl km 131r that had the same problem i replaced the clutch with a brand new one and the head still spins at idle

[@josenovelo803]

I have same issue with my echo srm 266 how can I fix it

[@hanksbud2544]

Excellent, thank you.

[@tonym6920]

Nice fix Dony! Is that issue and fix the same for Echo trimmers? Thanks for the vid! 👍👍

[@donyboy73]

yes very similar

[@edjohnson5811]

This question is not about this awesome video but about a Stihl FS56 that leaks fuel everywhere even when lying down. Do you have a video that could give me some insight?

[@donyboy73]

Could be fuel line or gas cap

[@Mcloven1503]

Is it the same for echo?

[@TheTrailblazer1974]

Best to just remove clutch for cleaning of studs and such then put spring on clutch before installing.

[@johngrossbohlin7582]

Surprises are fun!

[@gadasavideos8564]

You can actually buy the spring? Figured you would have to buy whole clutch. For curved shaft you can't buy shaft bearing but have to buy whole shaft at 50% price of new trimmer.

[@garyalensr]

Awesome job as usual, I have a question? Do you know how many turns out from lightly seated a Husqvarna 128cd trimmer is. I'm fixing my sister's and really don't wanna use an aftermarket carb if I don't have to. I want to try this first. If it doesn't work then I'm gonna order an OEM carb. Thanks in advance good sir. Keep up the excellent work

[@donyboy73]

I start at around 1 1/2 turns out

[@garyalensr]

@@donyboy73 AWESOME THANK YOU SO SO MUCH

[@canoetipper019]

Thanks for another great video. So did I miss you lubing the shoe hinge point? What would you use as a lube for that? Cheers from NB

[@donyboy73]

I meant clean it!

[@canoetipper019]

@@donyboy73 sounds about right...lol. I could just picture the lube flying out of the hinge all over the drum. That could be messy...lol. Cheers

[@UncleTomma-vo7qo]

How do I fix stihl trimmer head won't spin

[@Pete.Ty1]

👍👍👍Thank you

[@markmauldin5867]

Another great video 😊

[@jeremynguyen2346]

Hey Donyboy73

[@tonypadilla6404]

I DID WHAT YOU DIDI ON MINE AND STILL SPINNING ?

[@24space310]

is it the same engine as the fs 90r?

[@evanchapmanfanman]

Yes it is, the engine is identical, the main differences are in the case and shutoff switch.

[@ChrisR]

Needs a deflector.

[@markhicks9545]

It's not often them springs break

[@donyboy73]

This one has a million miles on it!

[@MarioDallaRiva]

👍🏻

[@MercyMinister]

Good resource, Don. I have the same machine. Thank you.

[@vernonbruce3722]

$10, if you have the right tools

[@annierenard5954]

👍👍👍

[@jakedvarow]

❤❤

[@Bill-sp8kb]

Judging by all that rust, it looks like that machine was dunked in salt water.

[@robertyearian227]

Nice I had one doing that

[@joseperezirizarry1554]

🙂 gracias por tu video 🛠🔧🔩⚙🙏

[@donyboy73]

de nada!