Motorcycle Engine Modification Screw Cap Set: 30 ABS Plastic Covers in 8 Colours

Customising a motorcycle’s engine bay often involves replacing factory fasteners or adding aftermarket components, which can leave bolt heads exposed. This set of 30 ABS plastic screw caps provides a simple, effective solution. The push-fit covers give a tidy, finished appearance to M6, M8 and M10 metric bolts commonly found on valve covers, crankcases, ignition covers, and other engine accessories. Available in eight colours – black, red, gold, blue, silver, green, orange, and purple – the caps let you colour-match or accent your build without permanent modification. They protect threads from road grime and moisture while enhancing the visual detail of your modified motorcycle.

Features and Construction

The caps are designed specifically for the motorcycle environment, where vibration, temperature changes, and exposure to fluids are common. Their construction focuses on simple installation and reliable performance as decorative protectors.

Material and Build

Made from injection-moulded ABS plastic, each cap offers good dimensional stability and resistance to many automotive chemicals, including oils, fuels, and cleaning agents. ABS is a lightweight, non-conductive material that won’t corrode or conduct electricity, making it safe for use around the engine bay. The moulded-in colour means the hue runs through the material, so scratches or minor abrasions are less noticeable than with painted metal covers.

Size and Practical Fit

The caps are supplied in a set of 30 pieces, giving you enough to cover multiple fasteners across the engine and have spares for future projects. They are designed as a push-fit over standard metric bolt heads sized M6, M8 and M10, which are typical for Japanese, European, and many custom motorcycle engines. The internal socket is shaped to grip the bolt head firmly without special tools, and the domed external profile sheds water and dirt.

Uses and Placement

These caps are intended for non-structural, decorative protection on accessible fasteners where the original covers are missing, damaged, or aesthetically mismatched.

Event or Professional Use

For motorcycle show builds, custom projects, or restoration work, the caps provide a consistent, clean look across all visible bolts. Mechanics and customisers can use them to quickly tidy up an engine bay after servicing or modification, especially when original OEM covers are no longer available or are costly to replace. The colour range allows for subtle matching or bold contrast against the engine’s finish.

Everyday Home Use

For the home enthusiast performing basic maintenance or cosmetic upgrades, the caps are an easy, low-commitment way to personalise a motorcycle. They can be installed in minutes without removing the bolt itself, making them suitable for riders who want to refresh the look of their bike without extensive disassembly. The caps are also useful for covering bolts on aftermarket accessories like crash bars, radiator guards, or custom brackets.

Benefits and Buying Value

This product addresses a specific, narrow need in motorcycle customisation: affordable, versatile bolt-head protection with colour choice.

Reuse and Low Maintenance

The caps can be removed and reused if needed, as the ABS material flexes slightly without cracking. They require no maintenance beyond occasional wiping with a damp cloth if they become dirty. Because they are plastic, they won’t scratch or mar the surface of alloy or painted components during installation or removal.

Why Choose This Product

Compared to individual metal anodised caps, this 30-piece plastic set offers greater coverage per purchase and a wider colour selection. The ABS material is less likely to galvanically corrode when fitted to aluminium or steel fasteners. The set provides enough quantity to standardise the appearance across an entire engine bay, including hard-to-reach spots that might otherwise be left uncovered.