Exhaust: https://amzn.to/3qBTJLD (amazon associate link)
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One of our most popular builds has returned! The Rotary shifter kart (powered by a Hercules W2000 wankel motor) had been in storage since the last video we did with it of hitting the top speed. The clutch had failed at the end of the video due to the clutch pushrod welding itself to the ball bearings and eating through the lever arm. We had found a hydraulic clutch on ebay for a Harley that had the same size diameter for the pushrod, and it ended up working better than we expected! We also changed the gearing to get us some better top speed!
Thanks for watching, stay safe and stay tuned for the next video!
**Be sure to check your local laws before driving any non-registered motorized vehicle. Do not attempt these activities at home. All content produced by Build Break Repeat is for entertainment purposes only**
MERCH

MERCHANDISE CUSTOM DESIGNED BY YOURS TRULY
https://teespring.com/stores/build-break-repeat
TOOLS
Texas Metalworks 40x80 Welding Table
https://texasmetalworks.com/product/fully-fabricated-welding-table/
RogueFab Tubing Notcher
https://www.roguefab.com/product/versanotcher-universal-tubing-notcher/
Pro-tools Tubing Bender
https://pro-tools.com/collections/tube-and-pipe-benders
Optrel Crystal 2.0 Welding Mask
https://usa.optrel.com/en/eye_protection_helmets/products/show/crystal20/
Optrel Grinding Mask
https://usa.optrel.com/en/products/augenschutz/helme-zum-schleifen-schneiden/products/show/clearmaxx/
MUSIC
Music - Background and Montage Music Is From Endemic Sounds
https://www.epidemicsound.com/
Intro Song - Jimmi by Andrew Applepie
https://www.youtube.com/watch?v=l1zHz8pYfyQ&ab_channel=AndrewApplepie
Montage Music - Lakey Inspired
https://www.youtube.com/channel/UCOmy8wuTpC95lefU5d1dt2Q

PARTS
DG Aluminum Silencer - http://www.dgperformance.com/motorcycle-exhaust.php?pyID=831
Seat - https://www.gopowersports.com/12-volt-9-amp-sealed-battery-ms7e-4-yb9l-b-sealed/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video
Battery - https://www.gopowersports.com/12-volt-9-amp-sealed-battery-ms7e-4-yb9l-b-sealed/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video
Axle - https://www.gopowersports.com/axle-54-1-diameter/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video
Bearings - https://www.gopowersports.com/3-hole-axle-bearing-kit/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video
Rear Wheel Hubs - https://www.gopowersports.com/1-hub-dual-mount-silver/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video
Front Wheel Hubs - https://www.gopowersports.com/front-hub-dual-mount-silver/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video
Brake Disk - https://www.gopowersports.com/8-brake-disc/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video
Sprocket Hub - https://www.gopowersports.com/1-bore-hub-with-1-4-keyway/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video
50 Chain - https://www.gopowersports.com/150cc-drive-chain-50-56-links/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video
Tie Rods - https://www.gopowersports.com/tie-rod-generic-3-8/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video
Rear Wheels - https://www.gopowersports.com/6-x-8-5-silver-douglas-dwt-wheel/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video
Front Wheels - https://www.gopowersports.com/6-x-6-5-silver-douglas-dwt-wheel/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video
Rear Tires - https://www.gopowersports.com/11-5-x-8-00-6-unilli-tire/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video
Front Tires - https://www.gopowersports.com/11-x-6-00-6-unilli-tire/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video

Foreign, so we're beginning to work in a new garage. We kind of have the idea of just kind of resurrecting the things that were really cool and i've just had a lot of time to sit and get a little rusty and stuff. So that brings us to our rotary shifter here kind of our pride and joy. So this thing needs a lot of stuff uh.

The trailer fell on it and it's not to see that's easy money, we'll just put a go power, support seat back on it. We also are going to re-gear the rear end, because even in our top speed video, we found out that it was limited by the gearing not because it was too tall, but because it wasn't allowing the rotary to get into the power band in sixth gear. So we're gon na change that out and then also we have the clutch has given us. So many problems, i'm sure if you all have followed this thing, we'll remember, but we're going to try to replace the old mechanical style with the lever that always got stripped out with basically a hydraulic slave cylinder master cylinder.

So that's going to be a lot of custom work, we're probably going to say that till the end, though, because i have not been looking forward to it. So, let's just start with the re-gear and the seat, because that stuff, i know we can come out on top of this - is our old sprocket. We just got it off and here's what our new sprocket's going to be so we'll definitely be burning a lot more rubber and it should get us in our power band at high speeds. So yeah we just need to build this thing up.

It looks like we are good here, not too bad, just a quick job joe we got joe helped us get the seat on, and then we put this sprocket on so now, let's just go over and finally get started on, checking out our rotary clutch. Well, i guess our welding table needed oil - oh um, so this nut is supposed to be on here and it's not. It was in the bottom of this, but it doesn't look like it caused any major damage. Wait what this nut! That goes right here.

That's pretty bad, that's not good! No, but it doesn't look um like terrifically broken yeah, although this this is like really. This is really the metallic metal oil see that yeah. Oh, it's crusty, something's crusty, it's probably just the welded part. No, it's outside the world.

Oh! It's just oh, it's the welded ball. Bearing let's see the end, looks, i think, that's a lot of the metal. We see dude, no, the ball bearings were in there and it's welded. Like look.

I bet i couldn't even break it. Okay, maybe there's the ball bearing right there. So if we could just like weld that shaft, i don't know well, we got good news and bad news, and the good news is mostly that we can work with what's bad. So the problem is, this: clutch is designed to spin and because this rod is spinning really really fast and this rod was stationary, which used to just go to a solid mount lever.

What happens is this is spinning and it goes against our bearing balls and it just completely melts and it gets friction welded together and that's why i had to snap it apart. So now we have two bearing balls that are welded together um and it's just kind of a train wreck, but the good news is: what can happen with this setup. Is that this rod can spin inside of this? This is like a 20 harley part. I got off of ebay because it's it fits a six millimeter rod like this one.
So if we wreck this thing at least it's not a proprietary like rotary part that doesn't exist anymore, so we got this mounted up. It didn't take too much fab. All i did was weld two quarter, twenty bolts, one to the existing bolt and then one to that plate. You all saw me make up so yeah we're crossing our fingers.

This should work, something i'm worried about. Is it kind of pivoting left or right and then getting off center, but i think it should work. I don't know, hopefully all right moment of truth. Let's see we go hey is that out? Let's see, oh, that actually might let's see it doesn't move.

So it's loose and then off. I think we got a working clutch dude. I never thought this would work. It really doesn't move much at all, i'm glad so yeah and it it doesn't take that much force either.

So like this isn't moving at all yeah. You know just kind of there push with my hands there. We go. That's so clean with our gearing done, as well as the clutch we're trying our very best to get this behemoth in okay, i'm going to bolt it for now we got the engine mounted.

So now the next step is to route our brake line from this brake master cylinder to our clutch. So on the ninja, this thing is pushed in. So we have to mount this kind of up front from the pedal, but it actually should look pretty clean and we can just mount our um. You know reservoir kind of in the middle up front.

It should be pretty nice so like that, so, okay, whatever that's crazy, hey guys. I hope you liked all of the footage of the hydraulic line install it looks really good so now the moment of truth is it looks pretty, but is it going to work? Is that moving it's moving dude? It feels really good on your foot. Yeah like it's. It's like get a front shot joe wow.

It doesn't have to move much. That's pretty bottoms up nicely on the cylinder. Does it feel like an actual clutch yeah? It really does like it gets a little bit harder at the end and stuff. No there's no feel oh, but it feels soft okay.

Well, that's nice! It's like the mx sure! Well now it works on that account uh. So now, what we'll do is, i guess, put it in first and see if i can push you, okay, that is first, okay, clutch in all right, just see if it is ice, it's engaged as engaged clutch in that's just a chain yeah, but that's not bad. Yeah, that's the chain on our roll that we made um but yeah. Okay.

I say we finish her up. It's been a really long time since this thing's even run so yeah. Let's just see, oh, oh, that seems good dude, almost not a big old flame dude. Ah, so um, so this thing is visceral.
The re-gear really kind of changes characteristics like y'all could see when we did the launches it just burned rubber and then even on the turns there there i was going kind of fast. I wasn't expecting it, but it was. You know, spinning the tires: it's it's crazy, yeah, absolute ripper, the clutch works yeah. We did it like, there's no, it works.

I mean we did a hydraulic clutch conversion on a you know close to 40 year old motor. It's pretty sweet, but with that being said, this thing is an absolute animal. I forgot we kind of built such a monster and it kind of is outgrowing these. You know this area we can ride in.

We need we kind of need a solution. So that's where we come to you guys we're asking: if anyone has access to somewhere pretty flat and paved, we would greatly appreciate it where we could really rip it. We definitely could take this thing to a drag strip. We also have a track membership.

So we'll see things out there but yeah. Let's, let's try to make some more awesome. Videos of this thing so stay tuned, the rotaries unless by like y'all's popular demand or whatever, is going to be kind of just like something we keep and is just going to pop up whenever we feel like we want to have you know, kind of a pick-me-up Vid, because this thing is so cool, but with that being said, thank you guys for watching. Thank you.

Powersports we'll see you next time.

Avatar photo

By YTB

20 thoughts on “Rotary powered shifter kart returns!!! major upgrades!”
  1. Avataaar/Circle Created with python_avatars Evan Field says:

    I think you can rev it way higher in the rpm's

  2. Avataaar/Circle Created with python_avatars Cy Layton says:

    Dallas kart racing facility is calling your name. Royce city DKC… Check it out!

  3. Avataaar/Circle Created with python_avatars Spinningtriangles brap brap says:

    My 14 year old son races a OTK ROK 125cc and it is very fast. I would love to see this rotary kart up against it. We run C12 and I am sure the rotary would be faster running this fuel as well. I know there is a lot more power that can be had from that rotary. I would love to see you guys continue to fine tune it for more power. The right carburation helps a lot also

  4. Avataaar/Circle Created with python_avatars Mike Hamilton says:

    Call Cletus MacFarlane at the freedom factory. I’m sure he’ll let you rip it. 👍🏻👍🏻👍🏻👍🏻

  5. Avataaar/Circle Created with python_avatars David Hunnell says:

    Could someone plz tell me the price of building this plzz

  6. Avataaar/Circle Created with python_avatars Jon Lobello says:

    As I said before I owned the bike back in the day and I think if I remember right, the listed top speed was either 80 or 85 (90 maybe…I don't remember). All I know is that try as I might I could never get the damn thing over 78 mph. I'd like to find another bike if I could. Or, even just the engine like you guys did and put it on a different bike frame. My current bike is an '88 Honda Hawk GT.

  7. Avataaar/Circle Created with python_avatars Egg says:

    It looks sooo good with the Mazda. 787B livery

  8. Avataaar/Circle Created with python_avatars Fifth Gear Bound says:

    I would use motorcycle oil that's JASO approved if you don't wanna burn up that clutch

  9. Avataaar/Circle Created with python_avatars Shawn Dubay says:

    That is badass!! Sounds great although a 16g turbo with intercooler would be amazing for mid to top end or even a small supercharger for ridiculous take off and constant acceleration through the whole rpm range. Just an idea. Would be like a RX-7 and go cart hybrid

  10. Avataaar/Circle Created with python_avatars 4T Power says:

    Hello

    I do not understand very well what you are saying because I am French, I would like to know if possible the following elements:

    -Cylindered engine

    -Approximate power
    thx

  11. Avataaar/Circle Created with python_avatars Victory First says:

    Where are you guys located ??? Will get back to you .

  12. Avataaar/Circle Created with python_avatars Kristian Gordon says:

    Probably be a lot easier to cut and grind shit with out the guard on the grinder

  13. Avataaar/Circle Created with python_avatars toni socias says:

    I'm not 100% sure, but the balls could be welded maybe because they were mounted the wrong order?? Other engines don't go in that way

  14. Avataaar/Circle Created with python_avatars TandM bros says:

    May i suggest, a rotary theme set of hubcaps

  15. Avataaar/Circle Created with python_avatars Francovi says:

    It would be beastly with an intake / exhaust port and a larger flat curtain carburetor!

  16. Avataaar/Circle Created with python_avatars Anggun leksono says:

    go kart with rotary engine? speed and power must be great. good job

  17. Avataaar/Circle Created with python_avatars Dkzii says:

    Would a freecoaster style hub from a bmx help with the rear axle and rolling in neutral/clutch engaged

  18. Avataaar/Circle Created with python_avatars Dkzii says:

    Race Jeremy from fasterproms shifter kart down the 1/4mile

  19. Avataaar/Circle Created with python_avatars Sruikyl says:

    Look up torrington bearings from a KTM. They use the same kind of hydraulic clutch setup with a rod.

  20. Avataaar/Circle Created with python_avatars Jose Morales says:

    Hi, where can I buy one engine like that one, or if someone here have one for sale please let me know

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