Moriwaki Zephyr: Moriwaki Power
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Moriwaki Zephyr: Moriwaki Power

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By JeffWare - 25 March 2022

Words: Jeff Ware Photography: Midori Moriwaki

The Kawasaki Zephyr 1100 was a brilliant bike that really never took off the way it should have here in Australia or NZ. However, if we could have gotten our hands on some of the kit that this Moriwaki Zephyr is decked out in, things would have been a lot different.

These would be a very, very rare find. 

If you are mid 40s, loved early 1980s superbike racing and always dreamed of owning your own ballsy air-cooled superbike – this bike will make that dream come true…

Ohlins shocks, Moriwaki braced alloy swingarm, billet alloy rearsets.
Keihin CVK34mm carburettors, Moriwaki engine covers and air scoop.

I can’t think of a tricker looking, more ballsy and tough looking nakedbike than this 1258cc big bore muscle bike – built by the company that so famously took on the world in the early 1980s with a naked, upright superbike – arguably the world’s first superbike… and one that kickstarted the career of Wayne Gardner.

Awesome era look exhaust system.

This bike was built in Japan by Moriwaki Engineering. Starting with a base 2006 Zephyr 1100, the cylinders were sleeved and bored to take huge 80mm Moriwaki pistons, running a compression ratio of 11.5:1.

Moriwaki bar risers and top triple-clamp.

Stock carburettors (Keihin flatslides will be available soon) are rejetted to suit the hot looking hand bent large diameter Moriwaki Monster exhaust system and modified airbox. Standard camshafts are used…

Moriwaki tail tidy.

The sump is replaced with a billet alloy Moriwaki oil pan and braided high-pressure oil lines supply oil to the air/oil-cooled engine.

The engine also has a Moriwaki billet alternator cover, right-hand engine cover, oil cooler and air scoop under the steering head. A trick looking clutch slave cylinder brace mount/countershaft cover is also fitted.

Marchesini forged alloy wheels.
The machine work is stunning.

The Zephyr has never been considered a good handling bike in terms of sports riding so Moriwaki Engineering have well and truly fixed that. With decades of racing success including their Moto2 machine, if anyone knows about handling it is these guys…

Alloy anodised rear sprocket and 520 kit. 

The forks are gorgeous Ohlins blacked out FS824K/KB 43mm inverted forks in Moriwaki billet triple-clamps, while the rear shocks are Ohlins S36PR1C1L items mounted to a seriously tough looking Moriwaki swingarm.

Chunky CNC machined billet triple-clamps.

Marchesini Kompo-Evo forged alloy wheels wear Sunstar rotors and the bike is stopped by Brembo calipers and Plot Swage Kevlar lines. Dunlop Sportmax 120/70 – 17 and 180/50 – 17in tyres are fitted.

1258cc big bore kit with 80mm pistons.

To protect the bike, Moriwaki crash knobs are fitted and the stunning paintwork, a replica job of the original Moriwaki superbike, was done by Design Factory, Japan.

Moriwaki sprocket cover.

Neat frame hole plugs, Moriwaki rearsets, PIAA HID headlight, POSH blinkers and Moriwaki bar risers top off this stunning machine that has more drool factor than any Zephyr we have ever seen, plus it has the power and handling to match the looks…

Absolutely stunning, in Wayne Gardner styling. 

MORIWAKI GOODIES

Exhaust system

Steering stem kit

Brake caliper brackets

Swingarm

Rearsets

Pivot plate

Clutch actuation kit

Spark plug cooling duct

Crash knobs

Fender eliminator

Alternator cover

Frame hole plugs

Carbon-fibre front guard

80mm piston kit

80mm cylinder sleeve kit

Billet sump

A legendary name…

SPECIFICATIONS

ENGINE 2006 Zephyr1100, DOHC air-cooled in-line four-cylinder four-stroke 8-valve, 1258cc big bore kit with 80mm pistons (1062cc std), 80mm x 62.6mm bore x stroke, 11.5:1 compression (9.1:1 std), digital ignition, dual plugs per cylinder, five-speed gearbox with wet multi-plate clutch, Keihin CVK34mm carburettors, Moriwaki engine covers and air scoop, Moriwaki Monster exhaust system

CHASSIS High tensile double-cradle frame, Moriwaki billet triple-clamps, Moriwaki braced alloy swingarm, Moriwaki rearsets, Moriwaki frame plugs, Ohlins 43mm inverted forks, Ohlins twin rear shocks, Plot Swage brake lines, Sunstar rotors, Marchesini forged alloy wheels, Brembo brake calipers, AFAM sprockets, Dunlop Sportmax Q2 tyres

STYLING Design Studio replica paintwork, POSH indicators, PIAA HID headlight, Moriwaki fender eliminator, Moriwaki carbon-fibre front guard.

Protect your motorbike. Call Shannons Insurance on 13 46 46 to get a quote today.