How To Make Your Own Sprockets! Make Your Razor E300 Faster! - Scooter Episode 9

I'd recently met up with some friends who have come to own some pretty quick scooters. Maintaining scooter supremacy is of paramount importance, so I set to work building some custom parts to change my gear ratios and go quicker than ever before.
This is a build you can pull off with just some basic hand tools in any average workshop. Get some steel, and have at it!
Support the channel on Patreon! - / tkoneniner
Music:
Moonfaker - Wild Oats - moonfaker.band...
Les Incoiffables - QNMLGB - lesincoiffable...
Software:
Sprocketeer 2 - www.idleamuseme...
Buy:
Razor E300 - ebay.to/2nklaOO
MY1020 Motor w/ESC - ebay.us/8iXomZ
Batteries - ebay.us/9FJOyz
BMS - ebay.us/ruUtdx
Dremel - ebay.us/jzd8zB
Cordless Drill - ebay.us/guPpJe

[@RimjobHimself]

A while ago an old dude gave me a scooter like yours and i asked you about some stuff and what you answered helped me a lot. I have now gone from 24v lead acid to my electric bike battery that are 48v and i bought a 500w 48v controller on AliExpress for it. It actually works very good but the brakes, oh my lord. Like yours before you changed them. Today they just failed me on my test ride downhill and i was about to roll straight into main road but luckily just managed to send it sideways into a different street and that saved me. The brakes was smoking like they were on fire. Kinda embarrassing as im 49 and have never ridden a scooter before and here i am. Lol. My sprockets are 11 and 80 and i could not find a larger 54mm sprocket with more teeths so i found a 9teeth sprocket and are gonna switch the front instead. Hoping it will pull harder uphill as that is my main issue being 92kilo. My electric bike got also a new controller and i upgraded to a 60v battery. Omg it rips. Straight wheelie. I need to be careful. The 60v battery i believe have fake 16awg cables and they feels thin very thin and im guessing thats why the voltage drops from 63v to 52v as soon as im on full throttle for 3-5 seconds. Can i just solder in thicker cables? Havent opened a 18650 16s battery pack before. Anyway thanks!!

[@WhatUpTKHere]

Really glad you weren't hurt - stock brakes do suck! Better wiring may help but make sure you know what you're doing before messing with the battery.

[@RimjobHimself]

@@WhatUpTKHere yep, Im familiar with electricity, and I tried a 60v battery on my 48v bicycle now. The claim was 28000mah 60v but I went from 64 to 45v within about 900 meters. That's almost 1 kilometer. Then the BMS on battery shut it down and I needed to replug it to wake it up again. Either the battery is so bad or I should buy 2 and parallel it to help each other.

[@RimjobHimself]

Any tips on stock brake and how to service them?

[@gyromatical]

That thing hauls ass LOL. Great job on the sprocket. Regarding the comment about the brushless, Razors are still relevant because they're readily available anywhere for small money and your mods take it to the modern age. It's great to be able to reuse stuff. I have eBikes I've built but still play with these motors, they're fun.

[@WhatUpTKHere]

Yeah I did chuckle when I looked up a scooter someone compared it to, and it cost $5000 hahaha. Cheers!

[@kabevis1]

TK greetings from LA. Please keep the scooter upgrades going.

[@WhatUpTKHere]

A place I one day hope to visit. Will do!

[@kabevis1]

TK, I’m also in the process of upgrading an E300. I’ve changed the controller to the 36v from FastScooters, replaced the SLA batts to Lithium, and was about to upgrade the drive sprocket from a 10T to 14T but burnt my stock motor before I could get there. So here I am binge watching all your vids again for the appropriate motor. I see you went with a 500w but are running it at nominal voltage. I want to buy a 24v 500w and over-volt with my 36v setup but am worried about toasting the coils. I don’t have hills and would only run it 3 miles between charges (~15 minutes straight). Do you think that could still fry it? Also how did you get over the decreased speed using the controller from eBay over your much faster hacked controller?

[@WhatUpTKHere]

Robert Trujillo hey Rob! So I did actually go for a 36V 500W motor. Unfortunately as you’ve seen in the series, despite the extra power, it rotates slower than an overvolted stock motor. That’s what prompted all the gearing changes. I wouldn’t recommend overvolting motors, it’s simply a good way to go fast for a few hours before you burn up an expensive motor.

[@WhatUpTKHere]

Robert Trujillo if you’re really light on it and keep elevation changes to a minimum, you might be okay, but no promises. I’m tempted to go brushless one day but $$$ are a big factor.

[@kabevis1]

Thanks for the prompt response and advice. I too want to go with a brushless and saw some videos on how you can repurpose a car alternator as one - well not fully, just not the rotor field winding. Either way I’m sure you’ll post the next build for us. Thanks again and btw your witty comments always have me laughing. ✌️

[@WeirdScooterKid]

That thing looks like it does great! i have my own e300 that i modified and the fastest ive gone on a flat 60 km/h

[@WhatUpTKHere]

Nice!

[@warrenmills7486]

The most simple way to make a sprocket is to wrap a chain containing the number of teeth you want around a blank disc of the correct diameter, so that the chain joins up properly with a joining link. Then sandwich the chain between two blank discs of larger diameter on a common shaft and squash the sandwich in a press. The rivets in the chain will leave punch marks on the blank disks which can be drilled. The drilled holes will have perfect pitch with no accumulated error. The disc can now be turned and filed to finish the diameter and tooth shape

[@WhatUpTKHere]

Ha. That is a great technique!

[@suicidebylifestyle9267]

This is really clever if you have a sacrificial piece of chain you can crush.

[@andrewharwood7033]

That is dedication, Making your own sprocket.

[@WhatUpTKHere]

Good fun too! Thanks for watching :)

[@cymeriandesigns]

Nice work. For anyone else doing this: consider using hand files to do the final refinement of the teeth, it gives you much better control, albeit at the cost of a longer time. If you want to see the kinds of precision that can be achieved with hand tooling, look at the Clickspring channel. That guy does amazingly beautiful things with hand filing.

[@WhatUpTKHere]

Clickspring is a god. Definite benefits to be had with hand filing, indeed.

[@WhatUpTKHere]

Did you see that card press build? Wild.

[@cymeriandesigns]

@@WhatUpTKHere I saw that. Exquisite, but I found myself thinking, "I want another Antikythera machine episode!" I'm ashamed of myself.

[@Bynming]

Starting to watch and if this handmade sprocket works it'll blow my mind.

[@Bynming]

Welp I'm impressed :D. Nice video.

[@WhatUpTKHere]

Thanks! It’s crazy how it looks versus how it runs.

[@BuildProne]

heyyyyy you got the chain tensioner right this time...nice

[@WhatUpTKHere]

Ahaha, I still get comments about that every few days

[@mondude9754]

Omg this is insain i literally have the same motor on a pocket bike and just made my own sprocket like a week before this video although in the end mine worked but was a little lopsided so the chain got loose and tight

[@WhatUpTKHere]

Thanks for watching! Sounds like a rad bike.

[@Thej-l2p]

Is that stock motor on the e300?

[@mondude9754]

@@Thej-l2p no tk modified. It to a 500 watt motor i think stock the e 300 has a 250 watt motor and like i said i also have the same 500 watt motor

[@lestergranger1685]

@@mondude9754 stock motor varied from 250 to 300. My 250w motor is over volted to 36v running 3x balance board batteries and a 500w controller. It eats batteries but its dangerously fast 😎😎

[@Thej-l2p]

@ Mon Dude ok i was wondering because i am in process of modifying my e300.

[@twood8032]

these videos were great. I am currently making my own sprockets

[@WhatUpTKHere]

Woo! Thanks for watching!

[@scottwilliams895]

What's the little grey display on the handlebars? Is that a cheapo bike computer... ?

[@WhatUpTKHere]

Battery Voltage!

[@chrishayes5755]

@@WhatUpTKHere you should install a heat sensor for your motor

[@bradleysnow2139]

I miss these scooter videos

[@WhatUpTKHere]

Glad you like them! Hope you dig the new stuff coming :)

[@imfine.4915]

I have an uberscoot electric scooter and I don’t know what sprocket I need for the brushless 48v 1000w motor

[@WhatUpTKHere]

Have a Google, take some measurements :)

[@breddy9282]

i have upgrade my motor sprocket to a 15 tooth and changed the chain with a new one it used to 17 mph and is now only going 13 with a 4 tooth upgrade the wheel spins very fast with no load but slow with load why is this?

[@WhatUpTKHere]

Hard to say without looking at your whole setup. You need a motor powerful enough to go faster, a simple gearing change on a stock scooter won't get you going at a higher top speed

[@breddy9282]

@@WhatUpTKHere i currently have a overvolted razor e300 with a fastscooters setup 36v would it be best for me to get a 36v motor and higher wattage more like 500watts or stay with 24v and higher wattage?

[@adrianduran4688]

Do they sell any bigger sprockets because I don’t have the tool to make a new sprocket

[@WhatUpTKHere]

I couldn’t find one this big unfortunately, you might have better luck!

[@namenameson8353]

Good one

[@WhatUpTKHere]

Cheers!

[@JamesJBurt]

What is missing from this: Ok, its faster, great. Now the speed exceeds the ability of the brakes to stop in a safe distance. Now the wheelbase is too short to be stable and avoid pitching forward. Now the wheels are too small to handle pavement issues at that speed etc. Now the lack of suspension causes the ride to be dangerously undstable. It is time to admit that speeding up this scooter is a bad idea, focus instead on longer battery life, and more torque for climbing hills.

[@WhatUpTKHere]

Did you check my rad disc brake update video? Mad skids! Longer range is a good idea...

[@warrenmills7486]

Credit to my mate John Taylor from Bendigo, Victoria Australia who designs and builds winning HPV’s

[@WhatUpTKHere]

Ah. Very cool! I miss my pedal prix days.

[@omernomer7429]

Hey Tk! I'm trying to import a dxf file into Inkscape, and when I do there is no image at all. do you have any idea why this is?

[@WhatUpTKHere]

Hm, hard to say! Try different export and import settings, check the ink color, and google for problems with the software you’re exporting from and Inkscape!

[@h4mm4d69]

IF I PUT A 36 VOLT BATTERY AND A 36 VOLT CCONTROLLER WILL I NEED TO CHANGE ANYTHING ELSE AND WILL I BURN OUT THE STOCK MOTOR?

[@WhatUpTKHere]

You almost certainly will burn out the stock motor in my experience, I’ve done it twice. Perhaps if you’re tiny or a child it might be okay but as an 80kg adult, it died for me in 6km

[@h4mm4d69]

@@WhatUpTKHere ok thanks f9r reply

[@jambowills7161]

"What up tk youtoube here" 🤣🤣🤣💀💀💀

[@WhatUpTKHere]

:D glad someone finally noticed the joke!

[@georgiospapadopoulos4811]

Hi to all ,before a few days I bought a scooter rezor e300.. I bought and a new charger I left for 8-12hours for charging and after I try to drive ..my problem is it’s working but as soon as I go up to the scooter it’s doesn’t going ..If I but something down of the scooter and I open its working very well.. with a person up it’s not going ..can someone tell me maybe what’s the problem ??? I look forward to hearing your thoughts...

[@WhatUpTKHere]

Could be batteries!

[@baleycasady7438]

You tired to drive a new charger you bought after you left for 12 hours. Um ok. And... your problem is... It's working ! You make no sense !

[@exavierdiaz-king3193]

Can you do it with an e100

[@WhatUpTKHere]

It's belt drive I believe so you might have to try a different method!

[@phildem414]

Have you considered drilling the round part of the sprocket teeth?👨‍🔧

[@WhatUpTKHere]

I have! A few peeps from the Hackaday comments suggested it. Seems like it’d be a great way to do it. As I lack decent drill bits and a centerpunch though I probably wouldn’t have used that method even if I’d thought I’d it.

[@joshuasmith6666]

READ THIS take the back end of one scooter and make front forks with it so then you can have a motor on the front and back

[@WhatUpTKHere]

That would be cool! Heavy, tho. Hub motor might be the go?

[@cameroncook975]

Why didn't you just put a smaller rear sprocket on it?

[@WhatUpTKHere]

Already put on the smallest one that was commercially available and practical given the hub dimensions. It’s all in the earlier episodes.

[@colvinau1403]

More E300 vids surly

[@WhatUpTKHere]

Yeah got something cooking this year

[@HushemFlupskluk]

I googled 19 tooth sprocket and got results. All this hard work for this worn out sprocket. Good video though thanks.

[@WhatUpTKHere]

And yet not a single one that suits the shaft size of my motor!

[@BayaniBuilt]

Thanks helped a lot

[@WhatUpTKHere]

No problem!

[@hungvo1745]

Good 👍💓

[@BuildProne]

I dont see why your having such trouble hitting 20mph. I have the exact same brush 36v motor and put a 15t #25 sprocket on the motor to the stock 56 rear, a 20ah lipo cell 1860 battery pack, $14 amazon generic brush motor 36v controller with xt60 connectors soldered on for motor and battery, and I have 10" northern tools tires on it and I hit 24mph max and around 17 uphills. goes just as fast on gravel too. recently I've been building a new one that I made piece by piece with scrap metal that I welded together and used a 48v 1000w brushless motor and 20ah lipo battery pack and my gear ratio is all screwed up, at the moment the gear ratio 15t -56t and it does a 2 foot high wheelie as soon as you hit the throttle barely and holds it for 5 feet before dropping back down, I hot 30mph on flat ground and 25 uphill.....scary.

[@WhatUpTKHere]

I suspect maybe our motors aren't the same, seeing as I had to go to these lengths to reach 24 mph (40km/h). My motor does rev low. In any case it's dead now so an upgrade is on the cards 🤣

[@BuildProne]

@@WhatUpTKHere mine was a brush motor looked exact the same as yours with 2500rpm. Maybe yours was running lower than what it was rated for? I'd do a brushless motor for your new one and make sure to use bigger tires so the motor doesn't get beat up as much

[@WhatUpTKHere]

Smart call

[@andy6041]

I found it's much easier to find a smaller sprocket in the back which Does the same thing....

[@WhatUpTKHere]

Already bought the smallest I could off the shelf, you gotta watch the earlier episodes ;)

[@shipbl1]

what up TK, youtube here

[@WhatUpTKHere]

Reporting in

[@chuckbailey6835]

How the hell dose some one get super glue in there eyes?

[@WhatUpTKHere]

I did a video on how

[@RoyAndrews82]

Very cool. (+1),

[@WhatUpTKHere]

Thank you!

[@shadowofsunshine6019]

BOI 40 KM THATS SO FAST

[@WhatUpTKHere]

ZOOOOOOOM

[@shadowofsunshine6019]

I saw another e300 in the video

[@WhatUpTKHere]

You sure did. ;)

[@shadowofsunshine6019]

What are u gonna use that one for

[@electromechanicalstuff2602]

Couldn't u have just bought a 3000 rpm motor for $70 ?

[@WhatUpTKHere]

Maybe! Can I have your $70?

[@electromechanicalstuff2602]

@@WhatUpTKHere sure if u need it. It's only money. Time is more valuable and you spent a lot of time making the initial wrong motor purchase try to work. We've all done it and it's always hindsight.

[@vandammestijn123]

Dear god what a disaster

[@WhatUpTKHere]

NEEEEEEOWMNNNNNN