Looks like it’s a little under designed. Not good in the long run for sure!! I don’t think something like that should be considered a “Critical Spare”. Should be over built not under.
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So after 2 weeks of waiting on the replacement parts, they finally showed up. They were unable to be expedited due to weather (the same weather I had to deal with without my Yarbo). Now trying to pull the old small pulley, it won’t come off the motor. Looking at the new part, it should slide right off once the nut is removed. Anyone else experience this? Looks like by the time this is resolved, winter will be over. I damn sure hope the mower works better. So far I’m not impressed! I tried to add a little force with a screw driver to get the old pulley off and the end cap of the pulley bent like tin foil and popped off.
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Mine slid off. Try some spray lub. It is a tight fit.
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Tech support responded with a video showing it slide right off.
https://www.youtube.com/watch?v=-QIcZm6ahj0&t=46s
In my case, this did not work. However I used a pencil torch and heated the pulley and was able to pry it off piece by piece.
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As a summary for anyone else who has to replace the small pulley that won’t simply slide off or anyone who has to make this repair. Start by giving yourself between 4-8 hours. A spray lubricant is helpful to let soak between the motor shaft and pulley. Using a pencil torch to heat the small pulley, be careful to keep the flame directed away from the motor. A small 3 jaw puller for pulleys helps break it free from the shaft. A large flat screw driver for leverage. To work it off once it’s broken free. Once you remove the old pulley, clean the shaft with a fine emery cloth till it’s smooth and the new pulley slides on without difficulty. Add a tiny bit of never seize to the shaft so next time it will come up easy (hopefully). Place the new washer provided by Yarbo onto the shaft. Slide the new pulley on and add the nylock nut. Tighten the nut down while holding the end of the motor to keep it from spinning. Place the belt on the pulley and between the motor mounts where it came from. Set the motor back upright and place the belt on the larger pulley. Put a bit of blue lock tite on the threads of the screws one at a time and start the screws but don’t tighten them. Once they are all started, use a small pry bar to push the motor bracket away from the large pulley to tighten the belt and while holding, tighten the screws down.
Stuff you will need, not provided:
Pencil Torch
Never Seize
Small Pry Bar
Large Flat Screw Driver
Small 3 Jaw Puller
Fine Emery Cloth
Blue Lock Tite
Good luck to anyone with the same issue. My over 30 years of mechanical experience has enabled me to make this repair. But I don’t believe this is a home mechanic type repair. Hopefully it will last more than 3 uses.
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Thanks for the information. I am about to embark on the same journey.
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Can you educate me on why this was necessary? Was the pully defective? I had to replace my belt but it just slid on. Maybe not that easy, but nothing needed prying.
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My small pulley was damaged, I think because of an alignment issue. The replacement came slightly modified with an extra spacer.
The large pulley was damaged by the belt failure. The aluminum is very soft.
The motor shaft seems to move about 2-3 mm. If it does that while rotating, it might account for some of the alignment issue.
I know, clear as mud. 
That said, it is an impressive bit of technology, that both manufacturer and owners need to work together to perfect 
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When the belts are breaking the metal bands inside the belt are damaging the small pulley. I kind of think the small pulley is the culprit as it’s actually 3 pieces, the spool and two end caps. I think the end caps are coming loose and that’s what causing the belts to shred.
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As others have mentioned, the screw by the wires only needs to be loosened. Do not fully remove that one.
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As an update, my belt broke before it could clear my driveway 3 times, took 2 weeks to receive the parts making me want to buy the extended warranty but after being told multiple times I could purchase it within 18 months I am not eligible because it’s been past 60 days. Yarbo doesn’t keep to their word! After purchasing it 3 months ago dealing with shipping delays and waiting on parts, I’ve only had a working machine for 25 days!
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That is concerning, when I bought my Yarbo, they were advertising give away for five year warranty, which is why I chose Yarbo, knowing that my Yarbo will be covered under warranty for five years was the selling point. If they are not honoring their words, it could be a big problem for me since my Yarbo is constant need of fixing and maintenance.
My math was simple, my unit cost was 5500 which translates to $1100 per year if I use it for five years, it is approximately thousand dollar savings compared to alternative which is grass cutting company and snowblowing company. I used to spend $2000 for both mowing and plowing per year for my math to work correctly. My Yarbo needs to work 2.5 years without hiccup. With their one year warranty, it never made sense until I’ve gotten the five-year warranty, but now I am worried.
If I’m in their product testing group or any other program that I didn’t have to worry about replacement parts or any service then I would not have any kind of worry about the Yarbo and will always be speaking highly of them regardless of what it is, however I’m just a normal user and these warrantees and aftersale service (which sucks) does matter, and no I don’t have a spare Yarbo either.
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Default warranty is 2 years. Extended warranty adds 3 after factory, giving 5. Any customer who bought a Yarbo after this offering had 60 days to purchase one if they didn’t do it at checkout. For existing users who bought a Yarbo prior to the offering of the extended warranties, you originally had 18 months to decide and buy one. Yarbo had worked out a deal with the insurance company to provide this retroactively to existing customers. That’s pretty amazing and kind of unheard of. However the insurance company decided to change those terms and set a time limit, rather abruptly to the end of January 2026.
I bought my Yarbo in August 2025 with the attachments and activated 8/20/25, blower came month later. Warranty expiration date is all over the map, it almost makes me believe that I’ve got some used accessories and nowhere where it says five years.
It won’t display the extended warranty dates because it is a third party. That starts the day the factory one expires. Even though the activation dates of your modules are different dates, the warranty starts 3 days after delivery of the module or upon activation, whichever occurs first. I see your SAM is before August, that was probably when they tested the unit at the factory. If you have any concerns about those dates, support can verify them and correct it on the back end as necessary.
Only thing that has me hesitant of that theory is, when I received my replacement S1 the belt broke almost immediately so I threw the belt from the old blower on and it’s been running months just fine.
I kept my original S1 belt for that exact reason. 
I knew that my original belt was good, and suspected Yarbo might have bought a bad batch of newer belts.
That reminds me… I should go take another look at my replacement S1’s belt while it’s nice and warm outside today.
Spin both ways to look for belt shift, and how much - clockwise vs counter.
I’m curious if that’s how this evolved on mine.
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Feels like pretty decent deductive reasoning.