Stealth Bike

G'day all! Been a long time since I did the stroll through this website.

Gotta be at least a year when I started my motored bike. The missus needed one first for travel to work and back, so I dropped a Zbox 50cc HT unit into her MTB frame and it runs very sweet.:D

Then it was mucho trials and tribulations designing and fabricatiing all the custom bits for my ride. Three design changes later and as many months labour, I had a swing-arm frame with 3-speed hub as a Jackshaft. This of course did not work as I pulled the hub apart for servicing and couldn't put the bugger together again. It then became apparent that the swing-arm was way out of alignment when viewed from the front. I did of course blame the meds for this and many other fumbles along the way.:cry:

I all but gave up on the project, but after a restup and rethink I started designing again. Upon perusing this site I was inspired to once again take up the angle-grinder and welder to begin a mad, but passionate journey into motoredbikedom. I reckon my greymatter has soaked-up everything there is to know about these Chinese HT engines and the associated problems with their running and drivetrains.

It is with many thanks to the contributors who make this site so informative that I finally present my nearly finished Reddbak-One stealth cycle. Tis satin-black in the hopes that the Wallopers (police) will continue not to notice the li'l 70cc engine tucked away betwixt the framework. She rides very smoothly and is quite comfy for my ageing posterior.:cool:

Forgive the lack of detail using a mobile phone for images. I shall upddate with better pics and more on the build at a later stage.:D
 

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Nice work!

Stealth, Hhahaha!

They'd never notice a 200lb man shaped like a cannon ball doing 30mph!!! I have the same problem here in NY. Quiet that thing down!
 
I dig it. So what was the final solution for the jackshaft? Is it a multispeed? Although I love the look, it looks more chopper motorcycle (suspension, tank, mirror and...well motor) than bicycle, not super law stealthy. Pedal when you see the fuzz and let off the throttle.
 
Yes it does look more motorcycle than bicycle, but I just couldn't come up with a design that would keep the bicycle look and be semi-recumbent. Due to a disability, I feel quite awkward and unsafe on a diamond-frame. But I'm working another design which seems more bicycle friendly atm.

The 'stealth' tag and concern over the coppers was mean't to be 'tongue in cheek' so to speak. The local law here in Bundy don't seem to mind these HT engines as long as you're not riding it as a motorbike. I haven't had any issues so far and yes I pedal when I notice them. They have however, clamped down on rack-mounteds and I reckon some of these were also being ridden by DUI offenders.

The Jackshaft is a rear wheel hub with a 36T sprocket welded to a spacer tube then welded to the left spoke-flange. The rightside has a five-leg star bracket welded to the spoke-flange and a BMX style Free-Wheel cassette spun-on to the outer. The assembly is off-set to the rightside. As I said, more pics are forthcoming.

Today I'm bending and welding a new exhaust manifold as the old one was rushed and has a lot of leaks. The Db are quite low as I made a replacement inner baffle-pipe for the muffler from drilled 16mm OD tubing. After swiss-cheesing the tube I rammed muffler putty halfway along and fitted a baffle-plate at this point. The baffle-plate was fabricated from a suitable welshplug and has six holes drilled around the disc.
 
Lookin' Good!

Reddbak,
Very nice looking bike. You've got the knack for sure. Will be looking forward to the more detailed pictures.
 
Looks like my Aussie cousin

Not a lot of stealth here / there. But the Wallopers actually like my bike. Gives em something to talk about between donuts.

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No Worrys Mate!
 
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Info update

So I've fabricated a new exhaust from manifold plate to engine pipe and was about to attach the current muffler I mentioned previously. Then I got side-tracked during my lunchbreak with a gaggle of designs I remembered. So I'll post them for interested viewers and make a decision later.

For now I'll stick with the top design, which is the current one and perhaps fabricate and test all the rest at a later date. BTW I discovered that an old steel, bicycle bell cover is the perfect size for the muffler casing end-piece. I also have a stainless-steel, Yabby-Pump that is the exact size for a new casing, hence the longer units in the drawing.

I've also included the electrical diagram which is in the works. The battery is now 12v 7Ah. :D

Well I previewed the images and they've submitted about half the size. Anyone tell me what I've done wrong here?:rolleyes:
 

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Not a lot of stealth here / there. But the Wallopers actually like my bike. Gives em something to talk about between donuts.

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No Worrys Mate!

Sweet ride mate. Nice flames!

I had airbrushed gold, Tribal-Flames on a Midnight Blue tankwhen I first completed this build. But I had a little accident and the bike dropped a metre down off the service ramp. Too many scrapes to do a decent repair.

What is the tank off or from?

Cheers
 
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