Key performance
Technical specifications
Engine
- Displacement
- 942 cc
- Power
- 52.0 ch @ 5500 tr/min (38.2 kW)
- Torque
- 79.4 Nm @ 3000 tr/min
- Engine type
- Bicylindre en V, 4 temps
- Cooling
- par air
- Compression ratio
- 9 : 1
- Bore × stroke
- 85 x 83 mm
- Valves/cylinder
- 2
- Camshafts
- 1 ACT
- Fuel system
- Injection
Chassis
- Frame
- Double berceau tubulaire en acier
- Gearbox
- boîte à 5 rapports
- Final drive
- Courroie
- Front suspension
- Fourche téléhydraulique Ø 41 mm
- Rear suspension
- 2 amortisseurs latéraux K-tech
Brakes
- Front brakes
- Freinage 1 disque , étrier 2 pistons
- Rear brakes
- Freinage 1 disque , étrier simple piston
Overview
Imagine a standard XV 950, this road bike with a 942 cc V-twin engine, rather restrained with its 52 horsepower. Now imagine that a detail-obsessed Swiss artisan kidnaps it and subjects it to a radical reinvention treatment. That is the essence of the GS Mashin "Ultra" Yard Built project, where personalization becomes a martial art, almost a mechanical sculpting act.

Tom Mosimann, the young head of GS Mashin, took this base and extracted a silhouette that seems to have come from a cyberpunk novel mixed with gothic influences. The result is a lowered machine, almost sprawling, with disproportionate wheels – 21 inches at the front, 18 at the rear – which give it the look of a futuristic and sporty cruiser. Everything is designed to be clip-on, modular, in bright colors that contrast with the usual black of custom bikes. And the original frame? Intact. This is the sacred rule of Yard Built: do not cut, do not weld the steel cradle. A constraint that forces ingenuity.
The craftsmanship here is raw, almost primitive in its methods, but with surgical precision. Mosimann shaped the fairing and tank from simple 1.5 mm steel sheets, using an angle grinder, a sandbag and a hammer for most of the work. It’s old-school metal-shaping, but with a new vision. The Bates spotlight, the integrated Highsider turn signals, the machined aluminum top triple clamp without holes for the risers: each element is an assumed aesthetic choice. And these prototype K-Tech rear shocks, inspired by Bullit, are not just for looks; they promise serious handling.
This Ultra is not a motorcycle for novices or classic touring riders. It targets the aesthete, the collector, the one who sees a custom as a mobile work of art. With its twin cylinder delivering 79.4 Nm of torque from 3000 rpm, it remains usable, but its appearance and giant wheels are more suited to exhibitions or styled straight lines than tight turns. It is a statement, a stylistic exercise that places GS Mashin among the greats of European personalization, where the idea takes precedence over simple modification.
Compared to other customs based on the XV 950 or even Harley Davidson Street models, this Ultra stands out for its conceptual radicalism. It does not seek nostalgia, but a form of architectural modernism. Its price, certainly high, is that of a work of art. For Yamaha, this project shows that their Yard Built platform can be a playground for the most daring talents, those who push the limits of the possible without altering the machine’s DNA. A success that impresses, even if one can question its daily use on the road.
Practical info
- La moto est accessible aux permis : A
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