Upgrading a motorcycle pays off more than upgrading almost anything else, because the mechanical parts are never hidden. A metal chain with separate links, turned screw heads, a brake disc with sharp drilling, a decal sheet with a correctly scaled carbon weave or a complete detail set cut for one specific kit: each of these replaces something injection moulding cannot do properly. This section gathers all of it, from single fasteners to full conversion kits.
The important question is compatibility, since most sets are designed for one named kit. Below you will find what each type of accessory does and how to tell whether a set fits the model on your bench.
Injection-moulded styrene has limits that show badly on a bike. A chain arrives as a solid loop with no gaps between the links, brake hoses are usually absent altogether, and fasteners are soft bumps in the surface. Photo-etched brass, cast resin and turned metal remove those compromises, and because a motorcycle's mechanicals sit in the open the improvement is more visible than on any other subject.
Detail sets and conversion kits are engineered for one particular kit, and the product description always names it. Check the machine, the version and the year before buying; a set cut for one variant will not sit on another even when the bikes look alike.
Most of what exists is made for 1:12 motorcycle kits. For 1:9 the choice is narrower and centres on metal forks and running-gear parts. Screws, hoses and wiring are the exception: they are universal and chosen by diameter rather than by kit.
Start with wiring and fasteners, which forgive a shaky first attempt and transform the look of an engine bay in an evening. Photo-etched brass and complete detail sets need tweezers, cyanoacrylate and a willingness to work under magnification.
Metal and resin need cyanoacrylate from the adhesives section and decent modelling tools; the machines themselves are in motorcycle model kits.
