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Kreidler Xray


Building a classic race Kreidler.











1: The engine - how lucky can you get?



2: Chassis - bend some tubes.



3: Suspension - Ebay rules!



4: The rest.











1: The engine - how lucky can you get?




It isnt everyday you stumble into a Kreidler race engine, loosely assembled by a mixture of parts,
which all happens to be brand new! It happened to me some years ago, and I decided to build a
racer around it.
First, an engine stand like the one I use for the Honda engines were made, and this four- way
adjustable unit makes engine work much easier.
Disassembly showed some shortcummings, but the engine was all in all a good starting point.
Watercooled, discvalved, six- speed transmission, a dry clutch, and Kreidler Cross housings.
Ordered gaskets, seals and various shims, to get this engine fully assembled, and having
looked at the space left with fairing mounted , made me decide to run this engine without
batteries too. That meant installation of a mechanical waterpump, and a self energizing
ignition. Waterpump could be driven by a toothed belt off the PTO and an innerrotor ignition
was mounted on a new disc- valve cover.
The Kreidler engine.
The Kreidler engine stand. Four- way positioning by detent and spring.
Transmission, straight- cut primary, and 5 plate dry clutch. Housings and disc valve.
Finished Kreidler engine.




2: Chassis - bend some tubes.




Inspired by the Rittberger designed Van Veen racers from 1981- 83, a frame was build from
20mm x 2 tubing. Headstock received conical bearings and rear swingarm made of square
30 x 15mm tube, was mounted in bronze bushings.
The first Kreidler frame.
Jig Chassis no5




3: Suspension - Ebay rules!




Found the right front fork through Ebay as a NOS item (New old stock). Its a Marzocchi 28mm,
not listed as a Marzocchi, but as a Malaguti 50 front fork!
So a little research will lead You to the right parts, at a much lower prize.
Marzocchi 28mm fork
And the Grimeca caliper bolted right on too. Triple clamps were swap meet items, had to be honed
to 28mm.
Grimeca
Finished fork setup. Everything fits.
AR50 18x 1,4 Wheels were an Ebay find too - Kawasaki AR50/ 80 - Campagnolo lookalikes.
Modified both sides to narrow down overall width, and fitted an adapter into
the rear wheels 110mm drum, to form a hub for the rear disc.
Rear brake setup. Wheels all done.




4: The rest.




Opted for an aluminum fuel tank again. Hammerform was made of numerous layers of plywood. Roughly shaped plywood.
Too high, but has to be lowered past the frametubes. Carefully roll the edge and form the soft aluminum.
Sufficient clamping is nescessary. Identical left and right part.
Middle strip and bottom remains. All stitched up.
Sump added Frame hugging lightweight. Lid is a modified oil filler cap from a Rover V8.
Chamber layout with conical headpipe. Pipe and silencing unit.
Refillable silencer. This initial pipe will be tested against others.