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Motorized Tandems, Trikes and Recumbent Bicycles Trikes (tricycle) and recumbent bicycles can give the ultimate in comfort for cruising on long trips or just around town. Ad an engine and they will really turn some heads.

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Old 06-15-2015, 05:01 PM
msrfan msrfan is offline
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Default Gas Powered Crazy Kart Project

I'm sure all of you have seen the Razor Crazy Karts.


www.youtube.com/watch?v=FrGFjAlawmg

I'm in the process of gathering parts to build one powered by a Robin EC06 engine. It won't be easy, but I'll give it a try. Also it won't be a quick build because although I have it in my head how to do it, I still have a lot of engineering to do. I can get all the basic dimensions from the youtube video. I will be copying their basic design.
The motor spins at least 8000 rpms, and if my calculations are correct, at 4:1 reduction and a 12'' drive wheel, that's around 60 mph. So it will need a double reduction of twice that for a speed of about 15 mph. Probably using a jack shaft, but a planetary would be sweet.
The motor is about 3 hp and should pull an adult okay. It's off of a water pump that destroyed the impeller and the previous owner chose no to repair.
Here's what I have acquired so far.










My shopping kart casters and scooter wheels are a bit larger than the Razor's, so I'll have to lower the chassis around them. My main engineering problem is the drive assembly. Engine mounted to a plate chained to a jack shaft and then the wheel. The fork going from the axle up past the motor to a steering head on top with a small steering wheel. Then a frame member welded to the sides of the frame and going up the the steering head so the whole engine, drive wheel, jack shaft and steering wheel will pivot full circle, plus a foot throttle with a cable that has it's own pivot to turn with it.


Anyway, comments and ideas are welcome.
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Old 06-15-2015, 08:56 PM
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Springfieldscooter Springfieldscooter is offline
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Default Re: Gas Powered Crazy Kart Project

That's KRAZY!
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Old 06-16-2015, 08:27 AM
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max350 max350 is offline
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Default Re: Gas Powered Crazy Kart Project

It's crazy, but no motorized bicycle
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Old 06-16-2015, 03:32 PM
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irishpowerjunkie irishpowerjunkie is offline
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Default Re: Gas Powered Crazy Kart Project

Msrfan interesting choice of project, i have idea how you could do the throttle connection with full 360 degree workability, get a old bmx with gyro brakes and use bit at heax tube and extend length of second fitting final output cable, the bit at handle bars has a set of fittings so each cable is workable from virtually every possible angle.
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Old 06-16-2015, 05:18 PM
msrfan msrfan is offline
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Default Re: Gas Powered Crazy Kart Project

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Originally Posted by max350 View Post
It's crazy, but no motorized bicycle
Yeah, I probably should have put this thread in the Tavern with my four wheel project. Maybe we need a four and five wheel category. NOT!
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Old 06-16-2015, 05:20 PM
msrfan msrfan is offline
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Default Re: Gas Powered Crazy Kart Project

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Originally Posted by irishpowerjunkie View Post
Msrfan interesting choice of project, i have idea how you could do the throttle connection with full 360 degree workability, get a old bmx with gyro brakes and use bit at heax tube and extend length of second fitting final output cable, the bit at handle bars has a set of fittings so each cable is workable from virtually every possible angle.
Thanks Irish, that's exactly the type of thing I need. I forgot about BMX freestyle stuff. I'll make something similar. Good suggestion.
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Old 06-17-2015, 03:02 AM
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silverbear silverbear is offline
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Default Re: Gas Powered Crazy Kart Project

Jeez, that's nuts! Looks like a lot of fun, though.
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Old 06-17-2015, 04:55 PM
fasteddy fasteddy is offline
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Default Re: Gas Powered Crazy Kart Project

That video looks like the parking lot at 5:05pm where I used to work. That is going to be more action than you would get with a pocket full of honey bees.

Looking forward to seeing it finished.

Steve.
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Old 06-19-2015, 09:43 AM
msrfan msrfan is offline
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Default Re: Gas Powered Crazy Kart Project

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Originally Posted by fasteddy View Post
That video looks like the parking lot at 5:05pm where I used to work. That is going to be more action than you would get with a pocket full of honey bees.

Looking forward to seeing it finished.

Steve.
Yeah, when (if) I get it done I've got a young test pilot that owns one of the original Crazy Karts. If he gives it the ok, I'll try it myself. That should be a fun video.
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Old 06-23-2015, 01:07 AM
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Wink Re: Gas Powered Crazy Kart Project

The Razor Krazy Cart is cool and def Crazy.....I think the coolest and one of the fastest Micro-Karts around was the Razor Micro (also branded "Tanaka PaverRacer"). The video of this Aluminum framed version with dual rear wheels was the BOMB! These karts would smoke the GoQuads!

https://youtu.be/8IdAHcW4RhM

Talk about a mini drift mobile!
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