In this video we break out the old 1969 el tigre mini bike frame because we finally have an engine for it. Rotary power!! We are building a rotary mini bike! This thing is going to be like none other using a wankel power plant from a 60's Sachs KM48 rotary motor. This thing is a really good running motor that we picked up from an online auction and we only had to do a slight bit of modifying to get it to fit on our frame! Thank you guys for watching and be sure to stay tuned to see this thing get all finished up and driving for the first time!
MUSIC
Music - Background and Montage Music Is From Endemic Sounds
https://www.epidemicsound.com/
Intro - Jimmi by Andrew Applepie
https://www.youtube.com/watch?v=l1zHz8pYfyQ&ab_channel=AndrewApplepie

MERCH
MERCHANDISE CUSTOM DESIGNED BY YOURS TRULY
https://teespring.com/stores/build-break-repeat
TOOLS
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/
—————PARTS—————
Seat
-https://www.gopowersports.com/19-mini-bike-seat-coleman-ct200-replacement/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video

Chrome Shocks
-https://www.gopowersports.com/universal-adjustable-standard-shock-12/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video
Chrome Wheel
-https://www.gopowersports.com/6-astro-wheel-aluminum/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video

Inner Tubes
-https://www.gopowersports.com/410-6-tube-90-degree-valve-stem/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video

Tires
-https://www.gopowersports.com/13-x-500-6-turf-tire-2-pack/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video
Gold Chain
-https://www.gopowersports.com/rk-gold-premium-racing-chain/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video

Fenders
-https://www.gopowersports.com/4-25-wide-mini-bike-raw-steel-fender/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video
¾ Lock Collar
-https://www.gopowersports.com/jackshaft-lock-collar-3-4/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video

Brake Band
-https://www.gopowersports.com/5-carter-brake-band/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video

Brake Band Pin
-https://www.gopowersports.com/brake-band-pin/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video

Brake Cable and Lever
-https://www.gopowersports.com/mega-mini-bike-brake-kit/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video

Jack Shaft Sprockets
-https://www.gopowersports.com/12t-jackshaft-sprocket-5-8-bore/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video
Jack Shaft Lock Collars
-https://www.gopowersports.com/jackshaft-lock-collar-5-8/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video
Jack Shaft (10 inch with lock nuts and key)
-https://www.gopowersports.com/5-8-threaded-jackshaft/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video
Grips and Throttle
-https://www.gopowersports.com/throttle-twist-grip-7-8/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video
Clutch
-https://www.gopowersports.com/10t-3-4-bore-centrifugal-clutch-41-420/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video
Weld On Tabs
-https://amzn.to/2XOoIIv

Oh, do another mini bike build, but this one is, unlike any other we've done before. Hopefully you can tell by the title and by looking at it right now, we're gon na build a little rotary mini bike. So we're super excited. This is a 1970 lt gray mini bike that was originally all chrome.

This. This is like the we've owned this longer than any other project. We've ever had. We bought this at the first paid swap meet and we had other plans for it.

We've actually had a tillotson on this thing and driven it, but we actually made those videos like two years ago and we scrapped it from then the tillets that we did build for this is actually on our cafe racer mini bike. Now so we've kind of shifted directions, because it's like nothing's really felt right, but i think we hit it right now with this rotary motor, so this is a 160cc sax km 48. This is basically like the predator 212 of rotaries, like they put these on pressure. Washers, basically any kind of utility application they used.

It not really sure why they use the rotary, but we're sure happy that these exist because they're pretty cool, so we're going to be putting this thing on the bike. But we did actually uncreate this thing. Like probably six months ago, so i have some footage of us starting it up right out of the crate that i'll put in right now. So i hope that got you a little bit excited for this thing coming up, because it sounds so cool.

So now the first order of business before we can even think about getting this thing on the bike, we need to make sure we can get a clutch hooked up to it. So the problem we face is that this is a tapered shaft on this engine. Right here, which, unfortunately won't allow us to be able to put the clutch on, but the good news is this section is unboltable, so we should be able to with this three quarter inch jack shaft that does fit on our clutch. Make something happen all right.

Well, i guess it wouldn't be a fun build if we weren't well into bolts that are stripped out, so we got five of these out, but we got one more so we're doing the old weldy allen wrench in there trick. So wish us luck. It wasn't looking too hot, but but we made it happen, bent the allen wrench in half. But let's see, what's under here, sweet it's a hole right there, man, i i think we can just drill that straight nice to be three quarters all right, so we just drilled this out to three quarters.

So i hope you get an idea here. So this is going to slide in like this and then we'll be able to use our clutch here, she's going to go right on like that, and we have an operational clutch so now. What we got to do is this is pretty swell centered on here, because it is three-quarter joule that will use the drill press. So now we're going to weld this on cut the shaft to size and then we'll meet our mini bike.

Oh so small! Now so we're probably not going to be running this extended output shaft. So can you cut this down, not keeping the foot peg nope, we just finished up getting our three-quarter shaft welded on and so our motor's all good. So that means i took off the gas tank and i took off the exhaust and you can see how small of a little package this thing is. We should be able to squeeze a lot of power out of this thing in the future.
It's gon na be pretty sweet, but i'm just loving how this thing looks. Uh just take a second to just bask in the glory of the rotary mini bike. But now what we got ta do is we're gon na pull this thing off and we need to basically undo some of the uh bad metal work. We did in the past, basically just kind of disassemble.

This thing get it really cleaned up, because this thing is going to get re-chromed and all that, so we need to make sure it is. I thought that top-notch happen all right, so we got it completely disassembled and now we just need to knock out these few seized, bearings and then we'll go clean up the frame these are completely seized. These don't even remotely turn all right, so we just did a bunch of surgery to this. It's going to take a lot of cleanup and rewelding and stuff, but i mean these are pretty cool with these spring actions up in here when they're, both welded together this one's kind of a little bit more seized than the other one.

So i think, before we ride this thing, we're gon na have to you know, take these front forks apart and do some real cleaning up, maybe add like a greaser or something that way. These can stay super nice all right. So it's a lot nicer to buy engine mount plates, but because they don't sell that many for old rotaries we had to make our own slots, but we're finally done with that. Now that we got this thing all cleaned up, let's go.

Take a look at the parts that we got for this thing huge. Thank you to go powersports for hooking us up with all the parts. For this thing we have this sweet front rim that kind of matches our old one we're gon na have to polish that one up so they match. But it's gon na look really nice.

We got a brand new seat, some new metal fenders for the front and rear they'll go like that and then some brand new tires. Let's get this thing rolling again so because we are running these nice new, go power, sports rims and tires and they're a little bit bigger than what a stock lt grey was used to. We have to widen these forks out and it what seems like a really easy job actually has taken a couple of days, but i'm pretty proud of it, because what we did is we just kind of chop these two apart kind of put them in a jig Based on how far the tire needed to be apart and then cut in new front plates, so now what i'm gon na do is we'll get this on the bike and we'll finally be able to have this thing, be a complete roller all right. So, look at that guys, that's about four years worth of rust and stuff gone.

We successfully widened the front, and this is how this thing was definitely made to look. I really like a little bit bigger tire on it, but still kind of keeping it a little bit retro. So now what we need to do is we cut off the old spring mounts for the seat, because they're kind of old and torn out so we're going to re-weld some new ones on and then get the seat on and add a kickstand and then we'll wrap Up this video all right, this is smoke there we go so we got our go power, sports weld on kickstand right in here and basically that's all. It is a weld on kickstand super easy, slides right in like that and then you're rolling, coming out and you're.
Looking hey, you might as well just now, it's just gon na get changed, so this is our new front plate. Since we had to stretch it out. We had to make a new one and we're just welding it bit by bit and bending it as we go around all right, so we're welding on some springs with some weld on tabs. We get from amazon check it out for our affiliate links.

If you want to kind of support us and use this stuff that we use it works real well, but after this is done, we'll be able to sit on it and get the rotary on there and it's kind of going to be its final form. Whoa alrighty. As you guys can see, we made a ton of progress on this thing. It's already looking good.

We got it back to that kind of vintage state. If you didn't know better, you wouldn't know he did anything well. Maybe that might give it away, but it's got that nice classic look what we're going for and it's just going to be a killer bike. So thank you to go powersports for all the parts on this thing make sure to check us out on instagram at billbreaker.

Pete follow us on facebook subscribe. If you haven't already, thank you for watching and see you next time, good things.

Avatar photo

By YTB

27 thoughts on “Rotary mini bike build ep 1 frame and engine!”
  1. Avataaar/Circle Created with python_avatars Craig Monteforte says:

    Very cool motor I have a Uncle that is aEngineer, retired AirForce ,and a retired Commercial Airline pilot , he is super cool and has many inventions patented one of his things now is converting Rotary Mazda engines for Aircraft use I asked him why the older Mazda’s had a lot of engine failure by destroying the lining inside the engine he told me the main problem was inadequate cooling systems I don’t know if you can adapt some type of a external oil cooler ? On yours but I bet it wouldn’t hurt to do so of course on a mini bike if engine failure happens prematurely you can coast safely to another area unlike a airplane that may crash ?

  2. Avataaar/Circle Created with python_avatars Matt Kobylanski says:

    Hey, I just picked up that same frame, but without the rear shock, seat part. Any idea where I can pick those parts up?

  3. Avataaar/Circle Created with python_avatars Greg Steele says:

    First sledge I ever drove was my Grandpa's 1970 Arctic Cat with the Wankel. He had to replace the rotor sliders like every 1,500 miles

  4. Avataaar/Circle Created with python_avatars Steve Hall says:

    Emanual aponte has already built this bike with the same engine 1 year ago

  5. Avataaar/Circle Created with python_avatars MAD MIKE says:

    love your channel new to making my own wanna help and subscribe to mine

  6. Avataaar/Circle Created with python_avatars C.B. says:

    If you looked at the thumbnail you'd see they used a jack shaft. The rim is not on backwards.

  7. Avataaar/Circle Created with python_avatars Iosif Todor says:

    Jesus loves YOU! He care about you and even died for you and for your sins! You need to repent and trust in Him!

  8. Avataaar/Circle Created with python_avatars Alex Paulsen says:

    "I can't actually make anything, so I'll buy a bunch of prefabbed parts wherever possible and then some random bits together and call it job done."

    Cool idea for a minibike, but I don't know if I enjoyed watching this.

  9. Avataaar/Circle Created with python_avatars supensa ten says:

    Where did u buy the engine I've been looking for one for years any info would be much appreciated. Thanks

  10. Avataaar/Circle Created with python_avatars Kristopher Mitchem says:

    I have never seen a mini bike have that kind of motor on there is which is pretty cool though

  11. Avataaar/Circle Created with python_avatars The wonderful wizard of cods aquatics says:

    If you keep that airfilter your gonna have a wankel NOtary engine

  12. Avataaar/Circle Created with python_avatars Italo Ludgero says:

    Didn't know Zack de la Rocha started buiding mini bikes after Rage Against The Machine got dismantled

  13. Avataaar/Circle Created with python_avatars MrMattitude says:

    That rear sprocket lol, that should be fun. Good work, keep it up

  14. Avataaar/Circle Created with python_avatars Charles Alberti says:

    I honestly feel like a rotary is perfect for bike applications great power to displacement

  15. Avataaar/Circle Created with python_avatars Ian Thompson says:

    Love the cool content you guys have… plus the best intro… 👍

  16. Avataaar/Circle Created with python_avatars BILL WILLIAMSON says:

    "you can see how small of a package this is" yea thats what she said…………………sorry you lobbed it out there and I had to go for it lol

  17. Avataaar/Circle Created with python_avatars Shawn Ireland says:

    With the tapered shaft, it tells me that this engine ran a generator.

  18. Avataaar/Circle Created with python_avatars AcousticTheory says:

    Next thing to bring into your shop is a lathe. Then you can just make any drive flange you need.

  19. Avataaar/Circle Created with python_avatars Stephen H says:

    This is gonna be an awesome bike to ride. I've got a Sachs 303 snowmobile and the power delivery is unlike anything else, plus as long as you always run the right premix and never put the wrong spark plug in, they'll outlast any 2 stroke and make comparable power.

  20. Avataaar/Circle Created with python_avatars Hamed Lopez says:

    I have a friend that make one about a year ago and it worck great

  21. Avataaar/Circle Created with python_avatars Julius Vermeer says:

    I've had 2 of these engines but I'm in the Netherlands and there are no minibikes here so I never used them, did make a bunch of profit tho!

  22. Avataaar/Circle Created with python_avatars Leeyum_exe says:

    I have 4 Sachs rotaries of this type. I have a km3(mounted to the original lawnmower), km37,km48, and km24. I have fully restored all of them including machining the housings and replacing the seals. I have powder coated the bed of the lawnmower to original spec as well. I have completely rebuilt all of them and have manuals for all of them if you need any help or Manuals I can send them

  23. Avataaar/Circle Created with python_avatars Rick Duquette says:

    Your sprocket for the rear tire might be on the wrong side, or are you guys putting in a jack-shaft? But other than that cool video so glad you guys are doing another Rotary build.I'll be waiting for the next video that you put out on this build. Good thing that I'm a subscriber and hit the notification bell to let me know when your next video is available. ( cheap plug your welcome)

  24. Avataaar/Circle Created with python_avatars Tampa Boys Customs says:

    I want to do one of these so bad great work guys this is so cool

  25. Avataaar/Circle Created with python_avatars J K says:

    I'd like to see that rig setup with a converter belt drive.

  26. Avataaar/Circle Created with python_avatars ChrisNVegas says:

    Chromed? Why?
    RAT ROD.
    Leave is crusty. RAT ROD ROTARY.

  27. Avataaar/Circle Created with python_avatars Dan W says:

    Looks like it ought to be fun! I'm curious if that welded in 3/4 shaft actually runs true since you didn't really have any kind of jig to hold it in place when you welded it. I didn't see it, but I hope you welded the outside edge on that E-shaft adapter also!😉 What happened to the Hercules powered kart? Still running?🙂

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