Lauren HollandBy Lauren Holland

Updated November 2026

Motorcycle side cover repair is usually a straightforward job you can handle in a garage with basic hand tools. This guide walks you through assessing the damage, choosing a repair method that suits the material, and reinstalling the cover so it stays put on rough trails. Most cracks and loose mounts can be fixed in an afternoon.

Assess the Damage Before You Start

Before you grab any adhesive, figure out what actually broke. Side covers on dirt bikes and dual-sports are typically molded plastic, and the failure point tells you which repair will hold.

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  • Hairline cracks near a mounting tab usually come from vibration or a tip-over and can often be stabilized.
  • Snapped tabs or clips need a replacement fastener or a plastic-compatible repair before the cover can be re-secured.
  • Broken or stripped mounting bosses are the trickiest case and may require a bracket or insert fix.
  • Faded or brittle plastic is a sign of UV exposure, and a new cover may be the more reliable choice.

Repair Cracks in Plastic Side Covers

For cracks in polyethylene or polypropylene covers, a plastic welding kit or a two-part plastic epoxy works well. Standard super glue tends to fail on flexible plastics, so avoid it for structural repairs.

  1. Clean the area with isopropyl alcohol and remove all dirt, wax and grease.
  2. Drill a small stop hole, about 3 mm (1/8 inch), at the end of each crack to keep it from spreading.
  3. Rough the surface around the crack with 80-grit sandpaper so the repair material can bond.
  4. Apply plastic weld or epoxy along both sides of the crack, then press the halves together.
  5. Let it cure fully. Manufacturers of epoxy systems specify cure times, and rushing this step is the most common reason repairs fail.
  6. Sand the cured repair flush and, if needed, reinforce the back with a fiberglass patch.

Fix Loose Mounts and Broken Tabs

Once the panel itself is sound, check the mounting points. Most side covers attach with rubber grommets, plastic push-pins or a combination of bolts and tabs. Replace any worn grommets, since they absorb vibration that would otherwise crack the tabs.

If a tab has broken off, you can often rebuild it with plastic epoxy and a short section of stainless hose clamp or aluminum strap for reinforcement. For stripped bosses, a threaded insert or a larger fastener with a backing washer spreads the load and prevents the same failure again. Frame-mounted brackets should be checked for cracks at the same time, since a bent bracket will stress any cover you install.

Reinstall and Test the Cover

Reinstall the cover without forcing it. If it does not sit flush, the mounts are misaligned and will loosen under vibration. Tighten fasteners to the torque range in your service manual, and use thread locker on bolts that are likely to back out. After the first short ride, stop and recheck every fastener and look for new stress lines around the repair.

Common Mistakes

  • Skipping surface prep, which causes adhesives and welds to peel within a few rides.
  • Overtightening plastic mounts, which cracks the same tabs you just fixed.
  • Ignoring the cause of the break, such as a loose bracket or a missing grommet.
  • Using super glue as a structural repair on flexible plastic.
  • Riding before the repair has fully cured.
  • Two-part plastic epoxy: designed for flexible automotive and powersports plastics, so it bonds where general adhesives fail. View on Amazon
  • Plastic welding kit: lets you fuse cracks in the same material as the cover for a stronger bond. View on Amazon
  • Rubber grommet and push-pin assortment: replacement fasteners that restore vibration damping and keep covers seated. View on Amazon

FAQ

Can I repair a cracked side cover without removing it?

Sometimes, but removing the cover gives you full access to the back of the crack, which is where reinforcement works best. A cover left on can also trap dirt and adhesive in the wrong places.

How long should epoxy cure before riding?

Follow the cure time printed on the product, which is often several hours for full strength. Rushing the cure is a common reason repairs fail on the trail.

When should I replace the side cover instead?

Replace it if the plastic is brittle, faded through, or cracked in several places, or if the mounting bosses are too damaged to hold a fastener. A consult with a qualified motorcycle technician can help if you are unsure about structural damage.

Conclusion

Good motorcycle side cover repair starts with identifying the failure point, then matching the fix to the material and the mount. Prep the surface, let repairs cure fully, and recheck fasteners after your first ride. A solid repair keeps your cover secure and your bike looking right on every trail.

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Lauren Holland

About Lauren Holland

Lauren Holland is part of our editorial team and reviews and edits our ATV, UTV/side-by-side & dirt bikes guides, checking product details against manufacturer specifications and owner feedback.