Introduced in 1981, Kawasaki GPz1100 has been called the last king of the air-cooled superbikes, a fuel-injected 1089cc hot rod that ruled the street and strip until the rise of the liquid-cooled, aluminum-framed sportbikes. Said MCN in a recent retrospective of the machine:
“For a fairly brief, incandescent, riotous period in the early to mid-1980s, the ultimate incarnation of Kawa’s air-cooled fours became the GPzs.”
In 1983, the final incarnation of the GPz1100 appeared. Known as the ZX1100-A1, the bike boasted “Uni-trak” mono-shock rear suspension, anti-dive units on the forks, revised cams, a styling overhaul, and an improved power rating of 120 bhp — class-leading at the time. The whole GPz family was a dominant bunch, but as MCN declared, the 1100 was always “The Daddy” bike:
“The final GPz1100A was, and remains, some kind of ultimate. It was top dog at the end of the era of air-cooled superbikes.” —MCN
Enter our friend of Darren Begg of Canada’s dB Customs — a man who’s earned his reputation building some of the baddest, most well-executed superbikes on the planet, most of them air/oil-cooled monsters like the Honda CBX1000 restomod we recently featured. Suspension, brakes, wheels, and engines are all upgraded — while retaining the style of the original machine.
Now Darren’s back with the ’83 GPz1100 (ZX1100-A1) you see here, built for a customer in Texas. In true restomod fashion, this GPz has been brought into the modern age with Öhlins suspension, OZ Racing forged aluminum wheels, Brembo brakes, and a GSX-R600 swingarm conversion — one of the most challenging aspects of the build:
“Swingarm conversion was a bit of a challenge to determine the appropriate linkages to set the desired geometry and have sufficient clearances to achieve full range of suspension motion.” –Darren Begg
Then there’s the engine: 1170cc forged pistons, .410 lift cams, a welded crank, 35mm Keihin FCR carbs, and a 4-into-1 hand-bent titanium exhaust from Bito R&D. The engine has been Cerakoted and the paint sprayed by Sketchs Ink — no vinyl!
The Canadian roads have postponed testing, but we’ll be after Darren for riding impressions and a sound clip of this mean green godzilla come spring!
Kawasaki GPz1100 Restomod: Builder Interview
• What’s the make, model, and year of the bike?
1983 Kawasaki GPZ1100 (ZX1100-A1).
• Why was this bike built?
Customer commissioned build (customer from Texas).
• What was the design concept and what influenced the build?
Customer wanted a similar look to the GPZ’s built by AC Sanctuary in Japan, in green.
• What custom work was done to the bike?
1170cc Wiseco forged piston engine with 410” lift cams and welded crank. 35mm Keihin FCR carbs and 4-1 hand bent titanium exhaust from Bito R&D.
GSX-R600 swingarm conversion with Ohlins suspension and OZ Racing Gass forged aluminum wheels and Avon Spirit ST tires. All brakes by Brembo including RSC masters and levers with hydraulic clutch conversion.
Woodstock billet rearsets. Sculpture billet triple clamps. Koso GP gauge.
Paint and Cerakote engine coatings by Sketchs Ink (all paint no vinyl).
• Does the bike have a nickname?
Nope.
• Can you tell us what it’s like to ride this bike?
Winter roads prohibit test riding until spring.
• Was there anything done during this build that you are particularly proud of?
Swingarm conversion was a bit of a challenge to determine the appropriate linkages to set the desired geometry and have sufficient clearances to achieve full range of suspension motion.
Follow the Builder
Web: www.darrenbeggcustoms.com
Facebook: @dBCustomRestoMods
Instagram: @dbcustoms_restomods
All photos by Darren Begg.
More dB Customs
Rolling Tribute: Honda CB1100R Restomod - 1187cc, Carbon Fiber CB1100R from dB Customs… Produced from 1980-1983, the Honda CB1100R was the company’s first homologation special, design specifically to win the Castrol 6 Hour race at Amaroo Park, Australia — then […]
Sinister Restomod: 1216cc Suzuki Katana - Blacked-out Super Kat from dB Customs… When the Suzuki GSX1100 Katana appeared on the scene in 1981, it looked like nothing else on two wheels. Suzuki had enlisted German designer Hans Muth to design […]
Green Monster: Kawasaki GPz1100 Restomod by dB Customs - Introduced in 1981, Kawasaki GPz1100 has been called the last king of the air-cooled superbikes, a fuel-injected 1089cc hot rod that ruled the street and strip until the rise of the liquid-cooled, aluminum-framed sportbikes. Said […]
Restomod Monster: Honda CBX by dB Customs - 1147cc CBX from a restomod master… Ten years after their introduction of the CB750, Honda unveiled the CBX 1000 — a six-cylinder, 1047cc superbike intended to show the world they were still the tip of […]
Flyin’ Merkel: Honda VFR750 Superbike by dB Customs - Period-correct AMA Superbike replica… Flyin’ Fred Merkel is one of the most legendary — even notorious — American racers ever to swing a leg over a superbike. Hailing from California’s Central Valley, Merkel quickly became […]
Suzuki Katana Restomod by dB Customs - Darren Begg of dB Customs has quickly established himself as a leader in world-class restomod builds. His builds often retain the original silhouette and paint scheme of the original, while upgrading the powerplant, suspension, brakes, […]
Suzuki GS1100 Restomod by dB Customs - The Suzuki GS1100 is nothing short of a modern legend. Introduced in 1980, it was the fastest bike on the drag strip at the time, clocking a 1/4 mile time of 11.39 seconds. Cycle World […]
Honda CB1100R Restomod by dB Customs - The CB1100R was Honda’s first homologation special, an exotic, road-legal sportbike built from 1981-1983. Based off the CB900F, the single-seat CB1100R offered 115 horsepower and 72 lb-ft of torque, and was intended to homologate Honda’s […]
Rear fender is kind of an eyesore, everything else looks spectacular! Even just putting a little bit of a curve in the bottom edge of that fender might be sufficient. Whatever it is, it sticks out.
Gosh, I had that bike in white with red wheels in the 80’s. I loved it so much. One day I reached 275 km ph on the free way (speedometer), during the winter in the fog. The bike was screaming. It got stolen, no insurance, just the loan to repay. You learn.
The toughest-looking, Mono-shocked GPz I’ve ever seen.
Brilliant attention to detail too.
Epic.
Why do they always leave the chain guard off?
I like this guys build’s and the fact that he keeps the classic looks that they came with,I guess that I should be putting my bikes up for sale at the same price that he does and not keep them to myself.
What is so special ,what did HE BUILD .Its all from other company’s .The frame needs bracing ,the swingarm is POS and at $40,000us its a joke .
Bike builders or designers are as there profession not a parts changer
Pingback: Speed Read, 28 February 2021 – Oliver Eliott Blog