Suzuki GSX1100S KATANA modified. “RCM-644” produced as a demo vehicle for the French “BS Battery” [Tokyo Motorcycle Show 2025]

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Suzuki GSX1100S KATANA


The modified GSX1100S KATANA was exhibited at the Bike King booth at the Tokyo Motorcycle Show 2025.

Suzuki’s famous GSX1100S Katana, which was released in 1981, is equipped with a high-performance air-cooled, four-stroke, in-line four-cylinder, DOHC, four-valve, 1,074cc engine that produces a maximum output of 111 horsepower.

The GSX1100S KATANA was very popular for many years, but due to its outdated engine design it was unable to comply with exhaust gas regulations and production ceased in 2000. As a final edition, only 1,100 units were released in Japan in 2000. This model sold out immediately, once again demonstrating the popularity of the Katana.

The photo shows the vehicle on display at the Bike King booth at the Tokyo Motorcycle Show 2025. The vehicle has been lightly tuned with a Yoshimura Cyclone muffler and turn signals embedded in the front cowl.


This Yoshimura Japan-made exhaust system is made up of a titanium exhaust pipe and a carbon-wrapped silencer. The Yoshimura Japan Cyclone exhaust system, which is used in races with Suzuki vehicles, is a popular item not only for Suzuki GSX1100S Katana owners, but also for other Suzuki owners.

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The needles on the Suzuki GSX1100S Katana’s factory speedometer and tachometer are parallel when the bike is stopped. This is a classic feature of the genuine Katana series.
Suzuki’s famous GSX1100S Katana dressed up with carbon fiber exterior parts! The suspension is thoroughly reinforced with Ohlins suspension | Motorcycle Show 2024

Suzuki’s famous GSX1100S Katana debuted in 1981. As its name suggests, the Katana features a sharp and unique form inspired by a Japanese sword. Here we introduce the “Final Edition,” the last Katana, released in Japan in 2000, limited to 1,100 units. We will also introduce the modified GSX1100S Katana, equipped with carbon fiber exterior parts made by custom shop Bright Logic, which was exhibited at the Ohlins booth at the Tokyo Motorcycle Show 2024. PHOTO & REPORT: Kita Hideaki Bright Logic https://www.bright-logic.com/ Ohlins https://ohlins-czj.jp/

https://motor-fan.jp/bikes/article/107082

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The new Katana is back in vogue! A collection of old Katana customs / Tokyo Motorcycle Show 2019 – Suzuki | Motor-Fan Bikes

With the arrival of the new Katana, the older Katana (GSX1100S) is once again in the spotlight. Many cool older Katanas were on display at the Tokyo Motorcycle Show 2019. PHOTO/REPORT●KITA Hideaki

https://car.motor-fan.jp/article/10008815

Suzuki GSX1100S KATANA…Complete machine built by RCM in Sanctuary (serial number: RCM-644)


RCM (Radical Construction Manufacture), developed by motorcycle customization experts SANCTUARY, is a fully custom-made complete machine production system that started in 2000.

The original complete machine “RCM” produced by Sanctuary is different from vehicles that simply have parts replaced. After the vehicle is completed, a road test drive of 200 to 300 km is carried out. Problems that are common in custom vintage machines are troubleshooted before delivery.

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The RCM-644 is a complete machine based on the Suzuki GSX1100S KATANA, produced as a demo vehicle equipped with the BS battery, which was developed in France in 2008.

The front fork is an inverted type made by Ohlins, the rear shock is an Ohlins Black Line, and the swing arm is a wide swing arm made by SCULPTURE.

The headlights are multi-reflectors and the front and rear turn signals are mini type.

The front and rear tires are Bridgestone RS11, with sizes F120/70-17 and R180/55-17.

The muffler is a full titanium Nitro Racing Weldraft 3D Titanium EX with a Valiant Titanium silencer (matte black).

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The RCM serial number plate is located below the tachometer. RCM-644 means “RCM’s 644th unit.”

Sanctuary’s complete machine, the “RCM,” is fully customized in every detail, from the engine, frame, suspension, and exterior.

RCM (Radical Construction Manufacture), developed by motorcycle customization experts SANCTUARY, is a fully custom-made complete machine production system that started in 2000.

RCM primarily accepts applications for Japanese on-road sports models. Up until now, they have revived “treasured big bikes” such as the Kawasaki air-cooled Z series, various Kawasaki Ninjas, Kawasaki Zephyr, Suzuki Katana, and Honda CB-F as modern versions.

The original complete machine “RCM” produced by Sanctuary is different from vehicles that only have parts replaced. The key frame is reinforced after being modified. In addition, special processing is carried out to match the chassis dimensions.

The engine was installed after a full overhaul down to the smallest detail. The suspension was finished with high precision and uses current high-spec parts. Every section, including the electrical system, intake and exhaust system, position system, and body parts, was produced using a process that allowed no compromise.

After the vehicle is completed, it is subjected to a 200-300km road test drive, and problems that often occur with customized classic cars are troubleshooted before delivery, implementing a thorough system.

The photo shows the complete machine “RCM-644” based on the Suzuki GSX1100S KATANA, which was produced as a demo vehicle equipped with the “BS Battery” that was developed in France in 2008. Everything from the engine, frame, suspension, and exterior has been fully customized. The customization menu and parts introduced are as follows.

Custom menus and installation parts

pistonWossner Φ73
cylinderDiNx Cylinder Boring & Honing/Block Top Surface Polishing
valvenormal
Cylinder headDiNx Katana Oversized Valve Guide/Seat Cut/Underside Polishing
camshaftnormal
crankshaftDiNx crankshaft bend inspection and correction
crankcaseTop surface polishing
Clutch housingnormal
transmissionnormal
breather coverOil cooler hose fitting compatible boss welding
Engine paintingFull Gun Coat
carburetorYoshimura Mikuni TMR-MJN Φ38/Dual Tuck Funnel
mufflerNitro Racing Weldraft 3D Titanium EX + Valiant Titanium Silencer (Matte Black)
Muffler stayOriginal One-off
Oil coolerNitro Racing 9 inch 13 Row
FrameDummy engine installed, laser measured and corrected, stretched

original frame reinforced and wide laydown processed,


drive chain line offset compatible inline processed,


black powder coated
engine hangarNitro Racing machined aluminum
Front and rear wheelsO.Z Racing GASS RS-A for ZRX1200 (F3.50-17 / R5.50-17)
Front forkÖhlins inverted ExM package (21FF5210 black inverted forks, 800mm length, 0.85N/mm spring rate)
Front and rear tiresBridgestone RS11 (F120/70-17 / R180/55-17)
Front and rear calipersF: Brembo CNC radial mount GP4-RX

R: Brembo CNC 2P
Master cylinderBrake: Brembo CNC radial pump Φ19

Clutch: Koken Brembo style lever assembly
Brake hoseAllegri Sholto System
Brake and clutch leversZETA RCM Concept Flight Lever
HandlebarsDaytona Aluminum Separate Handle
Steering stemSCULPTURE Inverted E×M Package Stem Kit
Steering damperOhlins steering damper E×M package prototype model
SwingarmSCULPTURE Wide Swing Arm + Block Piece Stabilizer & Racing Stand Hook
Rear suspension mountSCULPTURE Adjustable Rear Suspension Mount
Rear shockOhlins Black Line
drive chainEK530RCM (chain line 108mm)
Front turn signal stayMachined aluminum
Front and rear fendersCustom aluminum inner fender/rear fenderless kit
Oil catch tankAluminum one-off
Drive sprocket coverNitro Racing
SheetOriginal cutout/leather reupholstery
Main harnessOHNO SPEED
headlightsMulti-reflector
Electrical systemHigh-grade starter coil & MOSFET regulator

AS Uotani SP-II


BS lithium battery / custom battery case


OHNO SPEED starter motor
meterStack ST700SR Tachometer & Speedometer

Oil Temperature Gauge (One-off Original Inator Panel, Cowling Stay Mounted)

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[Suzuki 1000 Katana] Sanctuary perfectly restored! Reborn in its original complete form by “RCM”

A modified 998cc Suzuki GSX1000S KATANA (commonly known as Sen Katana) was exhibited at the EK Chain booth at the Tokyo Motorcycle Show 2022. This custom bike was made by custom shop SANCTUARY using their fully made-to-order RCM (Radical Construction Manufacture) service. The owner is an American living in Las Vegas. The GSX1000S KATANA, which had been stored as an immobile vehicle, has been perfectly evolved and revived by RCM, developed by SANCTUARY. Every part of the exterior, engine, and suspension has been thoroughly customized without exception. PHOTO/REPORT●KITA Hideaki SANCTUARY https://www.ac-sanctuary.co.jp/ EK Chain (Enuma Chain Manufacturing Co., Ltd.) http://www.enuma.co.jp/

https://motor-fan.jp/bikes/article/39549

A fully-complete Kawasaki ZRX1200R by RCM, crafted by motorcycle customization master “Sanctuary.” Serial No. 528 [Tokyo Auto Salon 2025]

Tokyo Auto Salon 2025 was held at Makuhari Messe in Chiba Prefecture from Friday, January 10th to Sunday, January 12th, 2025. The photo shows a fully customized Kawasaki ZRX1200R exhibited at the KOYORAD booth. It has been perfectly evolved and revived through RCM, developed by SANCTUARY. Every part of the exterior, engine, and suspension has been thoroughly customized without exception. PHOTO/REPORT: Kita Hideaki KOYORAD https://www.koyorad.co.jp/ SANCTUARY https://www.ac-sanctuary.co.jp/

https://motor-fan.jp/bikes/article/130808

Kawasaki Z900RS Modified [Sanctuary]: A standard look but with improved performance

The Kawasaki Z900RS exhibited at the Daytona booth at the Tokyo Motorcycle Show 2022 has been customized by Sanctuary’s RCM. Rather than a decorative customization that focuses on appearance, the key point is that it has been finished as an adult big bike that prioritizes performance while deliberately retaining the original parts. PHOTO/REPORT●KITA Hideaki SANCTUARY https://www.ac-sanctuary.co.jp/

https://motor-fan.jp/bikes/article/43641

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