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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Build Breakdown

Design & Build Time - 18 mths on and off

Frame - custom-built
Wheelbase - 1460mm (57.48")
Rake - 37 degrees
Front-End - sprung Stanchion Leg type
Front Wheel - steel 24"x 1"
Front Tyre - Maxxis Downhill 24"x 2.5"
Rear Wheel - Custom dual steel rims 24
Rear Hub - Custom-made from two freewheel hubs
Rear Tyre - Kenda Flame 24"x 3.0"
Front Brake - mechanical 160mm
Rear Brake - mechanical 180mm
Clutch - Zbox HT mechanical
Bottom-Bracket - custom-built 3 pce extended axle & shell
Pedal Gear Ring - steel 36T
Cranks legs/Pedals - steel
Engine - Zbox HT 66cc, rubber insulated mounting-blocks
Carb - stock
Exhaust - custom-built, thicker flange, 19mm eng pipe into 16mm baffle pipe
Tensioner - factory wheel & custom spring-loaded arm
Jackshaft - custom-built from freewheel hub
Jackshaft Sprocket (R)- 38T
Freewheel Sprocket - 16T
Jackshaft Sprocket (L) - interchangeable steel 28T from Gear-Ring cluster
Final Sprocket - interchangeable steel 28T from Gear-Ring cluster
Tank - factory, covered in filler and shaped
Saddle - custom-built steel-pan, high-density foam
Handlebars - custom-built 22mm tubing
Brake-Lever - factory, modified for dual cable
Pannier/Rack - factory rack, modified for panniers

****** ****** ****** ******
Attachment is a pic of the frame before I painted it black & lowered the saddle position.
 

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new close-up images

Completed the exhaust bending to match the downtube and bottom rail geometry. The pipe is held steady by an L-bracket fastened under the chain-tensioner nut.

Also extended the LH chainguard forward to the front of the coil sidecover. I looked everywhere in my junkbins for suitable plastic for this and found a perfect supply from an old game steering simulator base.

A pic is also included for the RH full-length chainguard which I fabricated from aluminium roofing panel offcuts and fibrefill putty. You'll also notice the chain tensioner on the axle-carrier, this was difficult but satisfying to make.

Next on the agenda is a full set of 12v electricals.:D
 

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