IRS Spool for Crosskart/Gokart for Mazda Miata Axles 

How do you set up for axles?

Can you send more information

Yo hold up. That's actually a brilliant idea

That's the plan of the channel.

Yes, we have another kart with around 100hp and a similar setup and have had zero issues. You have to get high-quality key stock (link in description). This is also the same kind of key stock that 200hp sleds have on the secondary clutch. If you get some made from chineseium it will shear right away.

Also helps to have key stock that runs a decent length of the shaft. I've seen 1" round stock with a key way work well with 60hp, only after it had failed due to only having just enough key for a sprocket hub. Once it was replaced (the key had messed up the shaft) with a new shaft and longer key stock it held up. Just need to run locking collars to help.

What if you did away with the key way and used a 1 3/8” 21 splined shaft and splined hubs? Of course I would use 1 3/8” bore flange bearings, but you think this would be a bit stronger?

@@sheets8277 if you could source them,they would be very tough.

Glad you liked it 👍

Wheel carrier is in a separate video. We do not yet offer these as there are many possible sizes but we are working on something.

Check out the channel page on a PC to view the email for some reason it won't show on mobile. I actually live 10 minutes away from Glyndon.

Just released a video about how to modify the flanges to fit whatever brake rotor or sprocket you want.

@@jdsgarage701 that is awesome news. I was starting to look up the prices for lathes, 3d printers, parts design software. But I will happily support you guys who are doing a lot of the hard work.

Just get a tight fitting washer, it’ll be fine

Sometimes keyways aren't cut properly and filing the keyshaft down is necessary.

ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-OAZpm4VLepk.html

If you were to get a peerless differential with the 1" axle I'm sure you can come up with something as far as putting the spool in the center of the two outer mounting plates because their spoil accommodates the drive sprocket on one side and the brake rotor disc on the other. The only issue would be the the width, of course it's a bit wider than this one. I've actually thought about trying this idea myself.

@@BubbaB43 yeah I think that's worth trying!

I agree - the title saying "differential" is the only problem.

Use a Subaru R160 differential with Polaris rzr 1000 axles and turn the motor side ways and bolt on a sprocket to the front of the diff and use a jack shaft across the rear to get power from where the engine clutch goes back to the front of the Subaru diff. Subaru cv joints have the same cv ball spider as Polaris rzr 100 cv axles. I took the Polaris axle slid off the ball spider, slid on the subaru ball spider so it uses a Subaru inner cv on the Polaris axle. I used all Polaris rzr 1000 axles and suspension because it is strong, cheap and easy to find on ebay. The subaru ball spider does need a tiny but of grinding so the splines go all the way in and the retainer ring fits but that can be done with a hand held die grander. I did use my lathe to do it because I have a lathe. The huge cool thing is the splines are the same on both and do slide together, that is awesome. The Polaris axle stays Polaris on the outer end and Subaru on the inner side. Fankin-axle, lol. The Subaru diff I found in a junk yard is a 4.30 ratio with viscous posi traction, I got lucky finding that as that was exactly what I wanted. Most of them are just open diffs like you want so that will be easy to find for you. Most are not 4.30 ratio but if you search you can find a chart showing what Subaru diff ratios there are and what the code is for them that if painted on the diff case. You can adjust over all gear ratio with your sprocket going from the jack shaft to the front diff chain. I am using a 500 Polaris snowmobile motor so i used a snowmobile clutch and jack shaft. All easy to find fairly cheap stuff. Yes the Subaru diff is a bit heavy but not to bad and it is totally bullet proof and can take well over 200 hp, so, your never going to break it. That is what i wanted as eventually I am going to find a big 150 hp snowmobile motor. The other nice thing about doing it this way is the carbs are on one side and the exhaust on the other, not in the front/rear. It is hard to route a huge 2 stroke exhaust around from the front of the motor. When I actually put all this together I will make a video showing how it all works and publish it. I love what JD and KJ racing are doing. I am a welder fabricator and machinist with lathes and mill etc but I am going to buy the KJ racing cross kart plans as it would take me years to figure out what spending 100 bucks on plans can get me up front so why not benefit from KJ and JD's experience.

@@robert5 Thanks for sharing

It's a 52t 530 chain sprocket.

@@jdsgarage701 Thanks!

Send an email to the channel (in the description) and we can work something out.

1993

Coming soon...

@@jdsgarage701 be happy to be first in line!

You can find it here. jdsgarage.bigcartel.com/product/cross-kart-spool-kit

All the files are already avaliable in the thingiverse link in the video description for this version. We will be releasing a new version soon, that we will be charging for that includes brake rotor and caliper.

It went on the chaincase for the snowmobile. We remade the spool to accept brakes. In our newest video.

Haven't had any issues whatsoever

That's exactly why we made it, to help other builders out.

It is square keystock. We bought it as is and cut it into segments. No further processing.

On our original design we were going to make the brake side big enough for a rotor but since we used a snowmobile engine the brake caliper is built into the chain case so only made it big enough to fit the cv axle.

I don't have a mill either but I dropped the shaft off at a local machine shop and they cut it for like $20. You can weld it but then you would be screwed if you ever had to take it apart. Alternative way just buy a shaft with keyway already cut. I've also seen people cut a keyway with an angle grinder with limited success.

www.thingiverse.com/thing:4902515/files Scroll to the bottom of the page, to see all files they will be .dxf files. Also check out the last link in the description if you need someone to cut them out.

It's a Suzuki gsxr sprocket

@@jdsgarage701 thank you sir and what about the brake?

@@TylerBrown-wq8hs Reused the brake on the chaincase from the sled.

Check out the engine video we talk more about it. We never put one on the spool we actually used the rotor and caliper off the sled and mounted it further up on the drive train.

If you watch our other videos we explain how we did the rear brake. A brake rotor can be added by making two of the flanges that the sprocket mounts to and just using a rotor on the other side.

It can't happen if you install the locking collars correctly. Also the cv axles don't even have enough plunge to allow it to happen either.

@@jdsgarage701 yes shaft cant move anywhere thanks to those locking collars, but what stops your plate sliding out just a tiny bit and messing your chainline? Is there a setscrew in those weld on hubs?