Electric YZ85 Dirt Bike - Part 4

In this video we are taking my old YZ85 dirt bike frame that I've had for years and converting it to electric. We are using a 72V 8000W hub motor and converting it to mid drive to solve the unsprung weight issue that hub motors have and installing the motor on the swing arm.
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Music by Epidemic Sound (www.epidemicsound.com)

[@whosaidthat5236]

That’s the craziest gardening tool I’ve ever seen! But it looks like a lot of fun to dig rows for growing

[@davestevens4263]

He didn’t say but he’s planting baby e- bikes in that row , then the next row will be corn 🌽 wtf lol

[@kwcslvr1]

I admire your tenacity! You were bound to get it right. Great project man, keep up the good content.

[@waynerogers379]

Got to say as a massive dirt bike fan especially 2 strokes it pains me to see you change so much of the original frame. But I love how your mind works and that you will literally fabricate everything yourself you will go far my friend. Peace ✌️ from the UK 🇬🇧

[@justinarseneau4450]

At least the frame was used for something 😀

[@ShinyUmbreon765]

​@@justinarseneau4450if he didn't convert it, it would be rotting away or sold to someone epse who would let it rot away. Most projects dont get finished

[@th3d3wd3r]

Gotta love the big hub, instant torque surge. Puts a smile on your face every time. More flux/field weakening will up your top speed at cost of range. Adjust your battery amps until it starts to trip your BMS and back it off a bit. Increase phase amps for more off the line and initial acceleration.

[@CodyMaughan-ez5xq]

Nice! Man thanks for sharing this I hope it helps him! Sounds like you know what your talking about!!

[@Censortubes]

It couldn't even do a wheelie. Have you ever rode a 85 before? They can very easy.

[@th3d3wd3r]

@firstname9811 an 85 can power wheelie? How light are you? Remember, no clutch to dump on electric. I have used a G450X for a while though. That can power wheelie, once it's in its power band. Something you don't have to do with electric, the torque is instant, no hanging around. Did you even understand the comment I left? Do you know what phase amps are vs battery amps? Field weakening?

[@Censortubes]

@@th3d3wd3r Thanks for proving none of you ride.

[@th3d3wd3r]

@@Censortubes Sorry I didn't see your response. I was out on the bike, you absolute weapon.

[@mattelliott7650]

Absolute technical Wizard. I love the build. Hats off to you. Well done.

[@22YZ450FX]

Awesome build! Can't wait to see what it can do in the dirt!!! Thanks for sharing!

[@BarnOwlProject]

I see blown tubes in the future from bead slip. That's a crazy amount of instant power. Absolutely love it

[@3949zxcvbnm]

just add more Psi

[@EQINOX187]

@@3949zxcvbnm Or go tubeless

[@pjks2006]

@@EQINOX187rim lock is all he needs lol

[@camdenbailey3185]

This project definitely interest me more than the others. I think small frame dirtbikes are better than larger bikes when it comes electric conversions. Just look at the market, there are tons of electric pitbikes for a affordable price. I cannot say the same for electric dirtbikes, even when made from scratch they'll still cost to much. Pitbikes/small framed dirtbikes are just awesome in general.

[@ametti000]

That's turned out really nice. Love the twin shocks

[@boryswwa]

Nice! No chain noise, More power, Helmet on, No gears, so no clutch in when changing them, PERFECT! I'm even more envious for that one than for the e-pit bike, although I must say that my eyes opened wide, when I saw a selection of an outrunner motor for this project :) It ended up great though! Would love to have such a vehicle :) Silent but fun! Great project.

[@budget_hobbies87]

Love the videos. Dude you have come a long way. I've been watching your videos here and there when I can since wayyy back

[@kensthorne7060]

I love the choice music you've chosen for this video, I'm an old school Christian metal rocker. Thanks for showing us all your talents and skills an inventions, your number 1

[@maxwellclark2994]

that is such a sick bike! crazy you built the whole thing and even the swing arm!

[@xpndblhero5170]

There's definitely something special about small electric dirt bikes that has a charm I can't explain, I'd like to see you try it on the road w/ street tires supermoto style.... I have a Razor MX650 like that that I've modified and it is so much fun because people don't expect it to be fast but they are. A 72v 10,000w system can get you in the 60s easily on a kids toy.... I'm glad you've finally found an electric bike that finally works the way I've been wanting them to work for you, congrats and now I want to see you build more electric toys. 😁👍

[@blobcsgo7190]

crazy how it looks like a normal dirtbike, nice work

[@davidspilman531]

When I see your notifications !!! All Right Another great video !! That darn thing has some torque now . Now you’ve got to take it apart again to paint it thanks for bringing more excitement back on my TV 😅

[@mdtbdt]

Thank you for your amazing craftsmanship. It really shows your raw talent inherited from a long line of dwarven blacksmiths. That thing looks fun!

[@chrystalnorthey2310]

Yes! 🎉 I've been waiting for this. I've followed all your builds u inspired my obsession for welding 🤙

[@graememorris270]

Dude you have killed this build 🤘. Nice work

[@mexlemax3307]

The bike is so cool! I really like the bike. You've done a really great job. Thank you very much for this tutorial. I wish you lots of fun with your hobby. Keep up the good work. I'm looking forward to your next project.

[@sebastiankotilainen7807]

I really like dual shocks rear suspension. Thats retro❤

[@joew2303]

You'll quickly change your mind about kickstand when it falls down during a jump or wheelie! Love the rest. You've progressively improved your knowledge and skills to a good fabricator. Nice work.

[@aarongrabowski3775]

If it has a strong enough spring it will be fine.

[@Kingjulian-]

best eletric build by far. great work!

[@olivernice8291]

Great build! Love your projects and the way you work

[@danf4616]

You should paint or get a vinyl sticker made that looks like a gas engine and put it on the battery box! 😁

[@theLyzhendricks]

that's just cheezy

[@BackroadOutdoors]

That would be to kid like

[@janeblogs324]

They run on liquid

[@davestaco]

A "Mr. Fusion" sticker.

[@Austin-qq7kt]

Or you should?! 😁

[@xlasvegan7x]

That hump you made on the seat pan is called a joggle. I’m a retired welder but we shared the shop with the sheetmetal fabrication dept. Seen plenty of those joggles during my career.

[@Skiridr22]

I can tell the suspensions are great I can hear you clearly when you speak while riding 👍🏾👍🏾

[@paulwatts905]

Fantastic build, thanks for sharing.

[@theFALL3n]

Would love to see the frame powder coated or painted. Nice new sticker kit. Would look sweet as.

[@matt8341]

Beautiful build. For more speed you could change sprockets or add voltage, do the second if you don't want to loose the torque it already gives off. Going 96v is much better than relying on Flux weakening

[@bonafide9085]

One day your neighbor will love you for your quiet vehicles.

[@Todd_Gerhardt]

Cracks me up how u always have to do a burnout and u sling it all in the shop every time! Lol

[@Mayhemjach]

That's bad ass. Never seen a mid mount hub motor. Amazing work man

[@ekengreken]

Nice work! You're good at what you're doing!

[@aserta]

I'd say let it stick at the speed it's at. More speed on this would only drain the battery pointlessly. First take it down a goat path and see what it can do. Also, yeah, the front suspension isn't quite right. Probably needs a rebuild. You've done an excellent job with this one. As bikes go, this one's your best yet.

[@Cowboys-bm4wh]

Sweet build. I wish I was as talented and had the tools you have. I just found your channel and have been binge watching your videos. Can’t wait to see what you do next. 👍

[@3949zxcvbnm]

I would use that to dig trenches to run wire and conduit under ground. If a rock get lodged near that motor expect an explosion. Should box in that motor as much as possible, for obvious safety reasons.

[@MaNNeRz91]

Always inflate the new tube slightly before fitting into the tyre 👌👌👌

[@aserta]

And use ludicrous amounts of talcum powder (just don't breathe it). It helps not only installing the tire over the tube, but also in use, because instead of chaffing and wearing down the tube inside the much harder tire, the talcum allows it to slip inside and rearrange itself more easily.

[@robertgoldbornatyout]

Amazing job well done, what a lovely good young man you are , Great work on the bike build, Thanks for sharing the video with us👍👍👍

[@Bartskarts]

Can't wait for the trail ride video!

[@michaelblacktree]

Chris: I finished the project! Let's test it out. His Workshop: What did I do to you? 😛

[@gowerski]

it is tradition that Chris must pick dirt and mulch out of his shelving for weeks after finishing a build.

[@johnmccanntruth]

I’d say your neighbor should be happy with this project…

[@bradleyj.fortner2203]

Well, you had to do something with that hub motor. When life gives you lemons, you make lemonade. Well done.

[@17madracki17]

Turned out so great !!!

[@user-im8yv6ne4f]

awsome work there guy....watch out e bikes are here....ride onnn.....

[@laymanengineer7502]

Most definitely the best electric bike build yet! This one seems like it could be an actual power platform option for a YZ-80. P.S. A 2 stroke YZ will certainly rip a trench like that. maybe even a little more. Wish it had gears like a gas engine

[@horstszibulski19]

Turned out great! Plenty of power and still looking factory...for the battery box I would cut open a jerry can and put the side panels onto the box, just for the looks... 😉 👍👍👍

[@mattketner7597]

I’m actually happy that you put a kickstand onto this build. It’s so damn annoying most bikes just don’t have them. Also I’d change the gearing just slightly, like a larger front sprocket by one tooth or so. Higher top speed, but a hair less torque.

[@TyinAlaska]

That rips. Nice job.

[@GiovanniTiziani]

amazing build!

[@paulshrubb2734]

Another great episode. Thanks.

[@AerialAcesRC13]

Congratulations!!? 🎉🎉🎉 You built the world's 1st 1:1 scale Losi MX, complete with flywheel and all!!!

[@pat_0248]

It is true that the silence of these QS Motors is very pleasant, I also love it and I have just bought myself one of the latest Alrendo TS Bravo of which I am going to put a first presentation and test video, and even if it's a transmission with a very wide belt, twice as wide as on an S, DS and DSR ZERO Motocycle, you hardly hear it and that's great too.

[@bradduranso534]

(A YZ 85 will definitely make those same ruts your build did plus more bud.) I have to say this is a very impressive build. If I had a garage, and a little more electrical knowledge. I would love to build my own elec. MX bike as a winter project. Fantastic content! Keep it up.

[@kmnevergivin_in2326]

Customary dirt in the shed burnout. Every build has one!

[@christopherallen9615]

You're just like my dad LOL. He is like an engineer, and I'm a minimalist. I would always be like, hey let's just change this or that, the bare minimum, and it should be just fine. My dad on the other hand is like or, we can throw everything in the trash except for this triangle thing. I would just start screaming no! It's never going to get done! But then the end result would be awesome. I remember roasting the tires of my monster truck golf cart back at the golf course when I worked there as a kid, like it was yesterday. We pretty much started the monster truck golf cart ran around here LOL.

[@bagpuss121]

Maybe Some People Believe Electric Power Is The Future, But Im Not One Of Them Because Nothing Sounds Better And Smells Better Than A Well Tuned 2 Stroke Engine Run On Castrol R .

[@EJ-74]

Definitely a good idea to add a skid plate, you would've regretted the crap out of that the first time you go out and a rock smashed the battery etc lol Cool build, love the dusl shocks, looks badass 🔥

[@eugenesbackyardrepair4593]

The environment he'd polluted or large fire he could start by puncture that lithium battery thanks him

[@kevinsellsit5584]

Be very careful with your regen settings now that you eliminated the freewheel on the motor. Setting the regen to 100% will send you over the bars just from letting off the throttle quickly. That said, you may like it set to 60-80% if you like massive motor braking.

[@seeseeph]

Brutall power! great stuff! thx 4 videos!!!

[@BraxxJuventa]

Well done Chris! 😁👍

[@mitchellrooks9547]

Looks great love it

[@Trevorkloida]

Love the mini builds!

[@danstuckey6365]

Nice build!

[@romankoteshov7638]

best teacher in this world

[@GroovyVideo2]

Sweet build

[@Ninoy2059]

Job well done. Congrats

[@TechKnowCSS]

BEST PROJECT EVER.

[@FarmerFpv]

If you're not going to reuse that hub motor on a rear wheel again you can shave down the outer diameter quite a bit to remove weight and the overall diameter. Your lathe should be able to fit it, I know my dad's manual Kent lathe to machine down the diameter of my 8Kw hub motor which was able to remove 3/4 inch all the qa around with sill having enough protection of the magnets. I was able to lower my mini side-by-side frame for a lower CG and have more clearance. It looks cool too when it's all silver. You gotta love that instant torque using the hub motor as a chain drive mid-mount motor. Your YZ 85 came out sweet.

[@jimhofoss9982]

that’s a sik bike build! You did a real nice job. Gonna program the controller for regen? You have the spinning mass of the motor to slow down on the rear brake, as well as the wheel. I think regen would help lots with stopping and slowing down. Keep a close eye on the six tapered bolts that fasten your front sprocket to the motor…you don’t want those loosening up! cheers, dude! Whooooop!

[@djSpinege]

heck yeah buddy. way to turn a bad situation into something awesome!

[@tristanmcnabb2741]

Woohoo 🎉🎉 man that's a lot of power buddy allsome stuff from cruzermans inventions 😄👍🏆 good work 😊🏆

[@EdwardRoss-tb5hz]

Well done!

[@lithiumminer]

this is awesome bro beautiful bike well done sir

[@razvangavan]

You're an awesome builder/fabricator, I watched you from the beginning. I would recommend you also to focus on the painting/finishing side of things because then you'll have the complete package. Great videos, keep up the good work! Regards!

[@dw600]

Love this build . Lost my spleen and half my pancreas to a dirt bike accident ,I know you make the right decisions but don’t forget protection lol

[@joebufford2972]

I think you got a good one this time, especially with that hub motor. Those are tough to make work right with the centrifical input

[@bryduhbikeguy]

There's 622 Thousand of us wondering 'Why didn't you at least Primer the frame and parts before reassembling'?You could use 'Weld-Through' primer so it all doesn't rust again./It looks Awesome,and seems to fly.The torque at launch seems great for trails,etc too.Kudos!

[@cthulhu8977]

From what I have seen he tends to fully test something before taking it completely apart (yet again) to prime and paint. I am not that patient and tend to sling paint when I think something is even remotely done... then grind some back off when I have to change something.

[@trinkladd]

Simple he wants to ride

[@Slashebeest]

You know it's a good RBW video when your shop is full of dirt 😂 👍

[@simanphenix5436]

Put the rear fender over the tire like a street bike. The way you have it the tire is still going to fling dirt and mud over the motor. Dope build..

[@th3d3wd3r]

Oh, a 3 speed switch is handy. Plus you can put a reverse switch on it too for assisted reversing.

[@knurf79]

Great build, really want to see how this handles in the dirt! If you're looking for more power and top speed, go higher voltage. So a new battery and a controller will do that. The motor won't run in to trouble from a higher voltage, it will actually run cooler for the same power output (as will the phase wires). For example the 100V 250A Trampaboards VESC one is about a quarter of the volume of your current ESC and will easily double the theoretical max power and increase top speed with a higher voltage (and/or with some field weakening). Pair this with a Cycle Analyst display. I've used it in my own projects and its well worth the extra spend compared to cheaper VESC controllers. I run it at 90v +6kW peak and it is barely warm to the touch after an hour. Setup/tuning will be a bit more involved tho, but likely has a lot more knobs to turn than what you're on now. Consider it if this one happens to give up the magic smoke... Heat buildup is a big problem for these large hubs, but injecting it with some ferrofluid and adding some cooling fins will help a lot there. Make sure to check the motor casing after some running time, ideally water/spit shouldn't sizzle away or burn a unprotected hand.. You could also look into regenerative brakes to improve on the brake performance and reduce wear. Finally, I would be *VERY* careful with that battery as it is, I seem to recall you run it with limited or no BMS (also not sure about the cells in that thing)? This is a serious fire hazard both when charging and discharging.

[@chanceisaac2691]

Wow very nice job

[@darrellcoy]

Love it man! Would like to see some mods to the other bike. Maybe limit output for battery life and lower it a bit to fit you more. Possibly even smaller wheels and tires to get it lower.

[@northwestmountainbikeaddic6874]

That’s sick!

[@tristanmcnabb2741]

Yeah 😂👍 cool stuff it's a little rockit for sure

[@DktheWelder]

Awesome bike it looks like fun ! Let’s see some wheelies 👍

[@ZSMracing]

Love you channel man but to be honest when I saw the start of this build I was like wtf are you gonna do with that motor😂 but fr it’s definitely one of you’re coolest builds, please keep up the awesome content!!!

[@dannybaars8663]

That nocking on the skidplate reminds me of the drum intro from Phil collins in the air tonight 😂. I really like your video's dude... Keep up the good work. Greetings from the Netherlands.

[@Mrak2k]

dude you're cool! great work! and amazing bike!

[@drgibs347]

Put heatshrink tubes on the charging wires... also put some padding or something to prevent the main battery wires from getting worn through and shorting on the battery box.

[@truthfindersarehere]

love how you spin themud into your garage haha

[@joneserupinsmoke9161]

Lol it's always more fun finding out the hard ways 😁👍👍

[@haisupercar]

a very unique and creative car my brother's invention

[@LmLBowens]

I like that Asplundh chip truck

[@charcoal386]

Real nice man

[@joaopauloxavier5318]

Excellent!

[@halmakenreuther8843]

Great job Sir 👌👍

[@robertmccully2792]

Got to admit he works hard.

[@Shaxa0601]

Bro it's Respect 👍 HELLO__UZBEKISTAN🇺🇿🇺🇿🇺🇿