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JADUS YAMAHA SR250
Background
This is the bike that Jadus was founded on. The bike was built to feature all of the custom parts that were developed and designed specifically for the SR250. The build is meant to be a classic - timeless, clean, simple, and appealing to all. The build took a total of two and a half years - simply because every single special part on the bike was sketched, developed, drawn up in 3D, prototyped using 3D printing (many, many times), laid out onto 2D technical drawings, production prototyped, test fitted, adjusted, tweaked and revised, then brought into production. If you are interested, most of this development process is documented both on the Jadus Blog and a very lengthy build thread on the DTT Forum.
Parts
The bike is comprised of parts that fall into three main categories: stock items, purchased off the shelf items and custom designed parts (ie. Jadus parts). The stock items on the bike are ones that are considered high quality with nice detailing from the beginning and that create some of the essence of the SR250. For example the rear guard, the switch blocks, the forks, triple tree, brakes, footrests and headlight. Even the frame was left relatively un-modified, just de-tabbed and a frame loop added. The purchased parts included a mini bates style tail light, Daytona blinkers (driven by a Motogadget M-Flash), a Ballistic 8 cell lithium battery, a non-vacuum fuel tap, cloth covered ignition lead wire, a non-resistor type spark plug cap, mini speedo with built in idiot lights, Bitwell style gummi handle grips, Royal Enfield levers, YSS rear shocks, a classic british style exhaust silencer, a RamAir filters foam air filter, a moped horn - stripped and painted, moped fork boots/gaiters and silver Yamaha XS650 tank badges.
Onto the custom designed components. In terms of styling parts, the bike features aluminium stanchion covering headlight brackets, a billet CNC machined fork brace which holds a specially developed aluminium front guard, specially developed stainless spokes front and rear - with a 16” wheel conversion up front, a CNC machined ignition relocation bracket, machined top yoke blanking kit - to cover the unused stock holes, machined aluminium centred speedo bracket, special above yoke ‘riser’ clip-on bars, CNC machined tank leveling brackets - to align the tank better with the seat and the frame, under seat electrics tray/tidy, under swingarm battery tray, specially developed seat - designed to fit the SR’s unique frame without major modifications, custom bent frame loop - to match the seat, custom designed short cable kit (brake, clutch, throttle) and specially developed 3D printed side covers with vinyl cut SR decal stickers. In terms of performance parts, the bike has a specially developed single walled stainless exhaust header, a billet CNC machined harmonic intake bellmouth, CNC machined ignition advance brackets, a billet alluminium oil filter cover cooler, finned billet valve inspection covers and cam cover, plus 20% stronger clutch springs with special spacers for increased clutch plate pressure.
Fit and Finish
Other work carried out on the bike includes: de-lugged and smoothed frame - then powder coated in satin black, shaved fork legs, powder coated rims, hubs, triple tree and guards, media blasted engine, brake covers and fork legs, 2-pack professionally painted tank, spray painted side covers and footrests plus stripped and re-plated hardware all around.
The colour scheme of the bike is black, grey and silver because it brings out the design features best - colours can be loud and noisy distractions from purity. This theme was also chosen because it was so common for timeless bikes from the 30’s, 40’s and 50’s - Matchless, BSA and Vincent for example. The material finish and colour choice on the bike is very selective - for example, there are only hints of chrome in very specific, chosen locations - not too much, just enough.
What style of custom is this?
We have dubbed it a ‘clean standard’, others have called it a bobber, others a cafe-brat, others a cafe racer, some even resto-mod. Perhaps it could have been released by Yamaha in the 80’s to fit more into the UJM category. It doesn’t matter, we think what matters is the end result is cohesive and original while still paying homage and respect to the engineers at Yamaha.
If you have any questions about any of the parts you see on the bike, please do not hesitate to contact us, otherwise, most of them are available for purchase on the webshop.
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JADUS YAMAHA XS750
This motorcycle was the first Jadus commissioned build for a customer in Stockholm, completed in November 2015. The base bike is a 1977 Yamaha XS750 2D. The build brief was simple; build something like the Jules Brans XS750 (featured on BikeExif in November, 2014) with some original tweaks for good measure. The result was a very clean and tidy looking ‘Brat Cafe’.
The engine was left as mostly stock although the common 2nd gear issue with these bikes was confirmed fixed by the previous owner and he had also installed a nice Lockhart oil cooler. The airbox was removed and pod filters were installed - with the carbs being re-jetted to suit. The tachometer was ditched and therefore a custom turned blanking plug was made to fill the hole in the engine. To save costs, the exhaust header was repaired in several places (rather than being replaced) and then modified to fit the 17’’ reverse megaphone silencer, which was then wrapped in black exhaust wrap.
The frame was de-tabbed and cleaned up and a rear frame loop was welded in. The subframe was then prepped, masked and painted satin black.
The original speedo is really beautiful on these bikes so a custom bracket was designed and fabricated to retain and position it in a central location. There is also a custom bracket for the small, center mount headlight - which doubles as a bracket for holding the front brake line splitter. The front guard was trimmed and lowered and an offcut from this was then re-cycled and used as a custom made rear guard/tail light/ license plate bracket - designed to flush fit/french the cat eye style LED tail light. Then there are custom made brackets front and rear for the new mini blinkers - designed to make use of existing mounting points. The fork legs, brake pedal, shift pedal, kickstart lever, front and rear guards, most of the brackets, and even the tank were all powder coated in satin black. A new set of super wide dirt tracker style handle bars were fitted, with vintage style grips added to compliment the look. To tidy off the rear of the bike, a custom seat was made up - with a moulded plywood base with threaded inserts and some sculpted foam on top, it was then covered by a local horse saddle maker in natural leather.
The front forks were rebuilt with new oil seals and fork oil and the rear was treated to an upgrade to 365mm progressive spring shocks. The brakes are stock but all three of the steel rotors were drilled. There is also a custom made to length brake line up front to accommodate the wider tracker bars.
The electrical components are all relocated and hidden out of site - some being in some empty space found under the tank, and some under the seat and between the frame rails. There is a light, compact lithium battery located behind the engine out of site - in a custom made battery box and the bike is running an electronic ignition (with the unit mounted under the seat). A daytona idiot light array was installed - which made up for the lost lights on the tachometer gauge that was discarded. One of the final cool touches was the ignition relocation - now just forward of the seat and under the right rear of the tank. Finally, all of the visible electrical wires were wrapped in fabric tape for that vintage look.