Cracked Motorcycle Fairing: Repair It or Replace It with Used OEM?

A tip-over in the parking lot, an over-tightened fastener, or just ten summers of sun: eventually a fairing cracks. The good news is that most cracked motorcycle fairings can be repaired at home for the cost of a tube of epoxy and an afternoon. The bad news is that the repair is the easy part; making it look right is where the time and money go. Here's how to decide between fixing the panel you have and replacing it with a used OEM one.

First, figure out what plastic you're dealing with

Flip the panel over and look for a stamp inside a pair of arrows, something like >ABS<, >PP<, >PA< or >PC<. This matters more than anything else in the repair.

• ABS: what most sportbike, sport-touring and naked-bike fairings are made of. It sands, glues and paints beautifully, and it can be chemically welded with acetone.
• PP (polypropylene): common on dirt bike plastics, fenders and some inner panels. Glue and epoxy barely stick to it. PP needs plastic welding.
• PA (nylon) and PC (polycarbonate): less common for body panels; usually windscreens and some brackets. Repairable, but each needs its own adhesive.

If there's no stamp, a quick test: put a drop of acetone on a hidden spot. If the plastic gets tacky, it's ABS.

How to repair a cracked motorcycle fairing

Prep (every method)

1. Wash the panel with soap and water, then wipe the repair area with isopropyl alcohol. Wax and road grime will ruin any bond.
2. Stop-drill the crack. Drill a 1/8" hole at each end of the crack. This stops it from spreading, which it will otherwise do the first time the panel flexes.
3. V-groove the crack on the back side with a rotary tool or a utility knife so the filler has something to bite into.
4. Rough up an inch on either side of the crack on the back with 80-grit paper.
5. Tape the front side to hold the crack closed and aligned while the repair cures.

Method 1: ABS slurry (ABS panels only)

Dissolve small shavings of scrap ABS (an old fairing tab, a piece of ABS pipe) in acetone until it's the consistency of syrup. Brush it into the V-groove and over the back of the crack. The acetone softens the panel and the slurry fuses with it as it dries, so it's not glue sitting on top; it's the same plastic bonded to itself. Add a strip of fiberglass mesh or drywall tape into the wet slurry for strength, then a second coat over it. Let it cure a full day.

Method 2: Two-part plastic epoxy with mesh (ABS and most others)

Use an epoxy sold specifically for plastic bumpers and body panels, not a general-purpose epoxy. Lay fiberglass mesh across the back of the crack, work the epoxy through it, and build up two or three layers. Cure per the label, usually overnight. This is the most forgiving method and it's plenty strong for cosmetic panels.

Method 3: Plastic welding (required for PP, best for structural cracks)

A plastic welder or even a cheap soldering iron with a flat tip, plus welding rod of the same plastic and a strip of stainless mesh. Melt the mesh into the back of the crack, then melt rod over it to fill. It takes practice on a scrap panel first, but it's the only repair that holds on polypropylene, and it's the strongest repair on anything.

Rebuilding broken mounting tabs

Snapped tabs are the most common fairing damage, and they're repairable. Rough up the area, build a tab from ABS slurry and mesh (or epoxy and mesh) in layers, and drill it after it cures. If the tab took a grommet, buy a tab repair kit with pre-molded tabs you bond on. Expect a rebuilt tab to be a bit weaker than the original, so don't over-tighten it.

Finishing the front side

Once the back is solid, sand the front of the crack flush, fill any low spots with a flexible body filler, sand to 400 grit, prime with a plastic-adhesion primer, and paint. Solid single-stage colors are easy. Factory metallics, pearls and graphics are not; this is where a "cheap" repair turns into a $200 paint job or a panel that clearly doesn't match the ones next to it.

Repair or replace? A quick decision guide

Repair it when:

• It's a single clean crack or one or two broken tabs.
• The plastic is still flexible, not chalky or brittle.
• The crack is in a spot that's hidden or easy to blend (a lower, an inner panel, near a seam).
• The color is a solid you can match with a rattle can or a touch-up pen.
• A replacement panel isn't available in your color, or the bike is rare enough that any original panel is worth saving.

Replace it when:

• There are multiple cracks, missing chunks, or the panel is deformed from heat or impact.
• The plastic is sun-brittle. A panel that cracks when you flex it will just crack again next to your repair.
• The crack runs through a mounting point or the fairing-stay bracket area. That's structural, and a failed repair at speed is a bad day.
• The panel has factory graphics, metallic or pearl paint that you can't reproduce. Paint alone will cost more than a used original.
• You care about resale. A bike with all-original, unrepaired bodywork sells for more.

Used OEM vs. aftermarket fairings

Aftermarket fairing kits are cheap for a full set and can make sense if every panel on the bike is wrecked. The trade-offs are real: fit is often off by enough to need shimming, the paint is thin, tab placement can be wrong, and mixing one aftermarket panel with original ones almost never matches.

Used OEM fairings pulled from a dismantled bike are the factory part in the factory paint. Matched to your year range and color code, a used panel bolts on and matches the panels next to it, and it usually costs a fraction of a new OEM panel. For older bikes it's frequently the only way to get an original panel at all.

How to buy a used fairing that actually fits

1. Find your color code. There's a label on the frame or under the seat listing the paint code. Manufacturers use different codes for the same-looking color across years, so match the code, not just the name.
2. Match the year range. Panels change with each generation and sometimes mid-generation. A listing that says "2005-2010" is telling you exactly which shape it is.
3. Confirm left vs. right, upper vs. lower. Most fairings are side-specific.
4. Ask about tabs and previous repairs. Request photos of the back side of the panel. Every tab should be intact and there should be no epoxy, mesh or paint overspray behind the panel.
5. Check the hardware. Quarter-turn fasteners, grommets, well-nuts and the fairing stay are often missing or broken on the bike you're fixing. Grab them from the same donor bike if you can.
6. Expect honest wear. A used panel may have light scuffs or a small scratch. A good listing will show them. That's still a better starting point than a cracked one.

About the author: Written by the crew at JTL Powersports, a motorcycle dismantler in Hartville, Ohio, run by two riders who have been stripping complete bikes and selling the parts individually since 2004. Questions about anything in this guide? Email jtlpowersports@gmail.com.