The AGV K1 S is a sport-styled full-face helmet built for everyday road riding, and its visor (shield) is the part riders change most often. Scratches, a switch to a tinted or photochromic visor for summer, or simply fitting an anti-fog insert all start with the same job. This guide covers AGV K1 S visor removal and refitting without tools, plus how to fit a pin-style insert and what to check before you ride.
Aftermarket visors for AGV helmets
The short answer: raise the visor to its fully open position, then work on one side at a time, easing the visor arm away from the side mechanism until that side releases. Repeat on the other side and lift the visor clear. To refit, hold the new visor fully open, line each side up with its mechanism, press until it clicks home, and cycle the visor open and shut several times before you ride.
How the K1 S visor mechanism works
Older and cheaper helmets often hold the visor on with a screw-on pivot plate on each side. The K1 S does not. AGV fits it with a quick-release mechanism, so the visor clips into a mechanism on each side of the shell and can be taken off without a screwdriver.
The mechanism also gives the visor several opening steps, so it holds at different heights rather than flopping between open and shut. Those steps are spring-loaded detents. The same spring tension that holds the visor at each step is what you work against when you take it off.
That is why position matters more than strength. The release is designed to work with the visor raised to the top of its travel. Pull on it half-open and you are fighting the detents, which is how riders crack a visor tab or scuff the paint around the mechanism.
One more point before you start: the K1 S replaced the original K1, and the two look almost identical from the outside. Check the label under the comfort liner so you know exactly which helmet you have. A separate guide covers what visor fits the earlier AGV K1 helmet.
What you need before you start
The swap itself needs no tools. A couple of minutes of preparation still protects the helmet and the new visor.
- A soft, clean surface for the helmet, such as a folded towel or the helmet bag
- A clean microfibre cloth for the mechanism and the visor
- The replacement visor, with its protective film left on for now
- The owner’s manual that came with your helmet, if you still have it
- Good light from the side, so you can see into each mechanism
Put the helmet on its back on the towel, chin bar towards you. That position lets the visor rise fully under its own weight and keeps both hands free. If your visor has a locking tab at the bottom centre edge, make sure it is disengaged so the visor can lift freely.
AGV K1 S visor removal, step by step
Take it slowly the first time. Once you have felt how the release behaves, the whole job takes a minute or two.
- Open the visor all the way. Raise it to the very top of its travel, past every detent. The release will not work properly from a lower step.
- Start on one side. Find the point where the visor arm meets the side mechanism. If your helmet has a release button or lever on the mechanism, press and hold it now.
- Ease the visor arm away from the shell. Hold the visor close to the mechanism, not at the far edge, and draw that side outwards and away with steady pressure. It should come free with a light click.
- Support the free side. Keep a hand on the loose end so it cannot swing round and mark the shell.
- Release the second side the same way. Keep the visor at the fully open angle while you do it.
- Lift the visor clear and lay it on its outer face. The inner face is where an anti-fog insert sits, so keep it off the towel.
If a side will not release, stop rather than pulling harder. Check that the visor really is at the top of its travel, then try again holding the visor right next to the mechanism. The manual supplied with your helmet is the final word on the release on your exact helmet.
Fitting the new visor
Before you fit anything, wipe the inside of each mechanism with a dry microfibre cloth. Grit in the slots is the usual reason a new visor feels rough or will not seat.
- Peel back only the edges of the protective film. Leave the centre covered until the visor is on, so your fingers cannot mark it.
- Hold the visor at the fully open angle. Offer it up at the same angle the old one came off.
- Align the first side. Line up the locating features on the visor arm with the slots in the mechanism.
- Press that side home. Push squarely and firmly until you hear or feel a click.
- Fit the second side. Keep the first side seated while you align and press the other.
- Cycle the visor. Lower it through every step, close it fully into the seal, then raise it again a few times.
A correctly fitted visor moves through each step evenly on both sides. If one side lags behind or the visor sits proud at one corner when closed, that side is not fully seated. Raise it, release that side and fit it again.
Finally, peel off the rest of the film and wipe the outer face with a damp microfibre cloth. The Highway Code puts it simply: “Before each journey check that your helmet visor is clean and in good condition.”
Fitting a pin-style anti-fog insert
A new visor fixes scratches and changes the tint, but it does nothing for fogging on a cold morning. An anti-fog insert does. It is a thin inner lens held a short distance inside the visor by two pins, with a soft bead around the edge that seals the gap between them.
That sealed layer of air keeps the inner lens closer to the temperature of your breath, so condensation has far less chance to form. Most insert lenses also carry a hydrophilic surface. Research on anti-fog coatings in Advanced Science describes how, on a hydrophilic coating, condensed water spreads into a thin film rather than the light-scattering droplets you see as fog.
To fit an insert to a pin-ready visor:
- Take the visor off the helmet first, using the steps above. Fitting an insert to a loose visor on a soft surface is far easier.
- Clean the inside of the visor with a damp microfibre cloth and let it dry completely.
- Hold the insert by its edges and seat one end against the first pin.
- Bow the insert gently so it shortens, place the other end against the second pin, and let it relax into place.
- Check the edge bead touches the visor all the way round, with no gap at the top or bottom.
If the bead lifts at one spot, the insert is not centred between the pins. Take it out and seat it again instead of pressing on the lens. The range of Pinlock-compatible anti-fog inserts explains insert sizes and how inserts compare with coatings.
Choosing a replacement visor for the K1 S
The swap is the same whatever the tint, so the choice comes down to when and where you ride. The table below summarises the main options in our AGV K1 visor and insert range.
| Visor type | Best suited to | Road use in Great Britain |
|---|---|---|
| Clear | All-round riding, dusk, night and rain | Depends on the marking on that individual visor |
| Light or dark tint (smoked) | Bright daylight | Depends on the marking; dark smoke tints are not permitted |
| Photochromic | Riders moving between sun and shade | Depends on the marking on that individual visor |
| Iridium or other mirrored finishes | Track days and off-road use | Not permitted at any time of day |
A clear visor is the safest single choice if you only want one, and our guide to clear replacement visors explains when a scratched visor is worth replacing. If you ride through changing light, a photochromic visor darkens in sunlight and clears again in shade.
For circuit riding, iridium visors cut glare on a bright track. Not sure which visor matches your helmet? The visor finder lists the options by helmet model, and each product page lists the models it is sold for.
The law in Great Britain: the marking on the visor is the test
In Great Britain the legal test for a visor is the marking on that individual visor, not its colour or the name of its tint. The Motor Cycles (Eye Protectors) Regulations 1999 prescribe BS 4110 and require that a protector is marked with an approved certification mark of an approved body. A visor is only road legal in GB if it carries that marking.
Iridium, mirrored and dark smoke visors transmit too little light to be legal for road use in Great Britain, day or night. They are sold for track and off-road use.
Selling eye protection for road use when it is not of a prescribed type is itself an offence under section 18 of the Road Traffic Act 1988. That is why ClearLine never describes any visor as approved or certified: we do not check the marking on individual items. Look for the marking on the visor before you ride on the road, and read our guide to tinted visor law in Great Britain for the detail. Riders in the US should check their own state’s rules instead.
Common problems after a visor swap
Most problems after fitting a new visor come from one side not being fully seated, or from dirt in a mechanism. Work through these before deciding a part is faulty.
The visor whistles or lets air in along the top
Check that both sides clicked fully home and that the visor closes evenly into the seal. A visor sitting slightly proud on one side leaks air along the brow. Release and refit that side.
The visor feels stiff or gritty
Take the visor off again and clean both mechanisms with a dry cloth. Do not spray oil or grease into the mechanism, because it holds dust and makes the problem worse over time.
The visor will not stay open
A new visor can feel slightly different from the old one until it beds in. If it keeps dropping after a few rides, inspect the mechanism for wear or damage and contact an AGV service centre, because the detent parts belong to the helmet rather than the visor.
Looking after the visor and mechanism
A visor that is cleaned properly lasts much longer before scratches start to distract you. These habits help:
- Never wipe a dry, dusty visor. Soak it with lukewarm water first so grit floats off instead of being dragged across the surface.
- Use a microfibre cloth only. Paper towels and gloves are abrasive enough to dull the surface.
- Keep solvents away. Glass cleaners and fuel can damage polycarbonate and the coating on an anti-fog insert.
- Clean the mechanisms every few months. Grit builds up in the slots, especially after wet rides.
- Store the helmet in its bag. That protects the visor from knocks and dust between rides.
Our full guide to cleaning a motorcycle helmet visor covers products and technique in more depth. For every other AGV model in the range, browse the AGV helmet visors and inserts. This guide was written by the ClearLineMoto team.
Visors and inserts mentioned in this guide
- AGV K1 S / K1 / K5 S / K5 Replacement Visor — Iridium, Smoke, Clear Tints
- Photochromic visor for the AGV K1
- See the AGV K1 anti-fog insert
- All AGV K1 visors and inserts
Frequently asked questions
Do you need tools to remove the AGV K1 S visor?
No. The K1 S uses a tool-free quick-release visor mechanism. You raise the visor fully, release one side at a time and lift it clear. A screwdriver is never needed for a normal visor swap.
Why will my K1 S visor not come off?
The usual reason is that the visor is not fully open. Raise it past every step to the top of its travel and try again, holding the visor close to the mechanism. If it still sticks, clean any grit from around the mechanism and use steady pressure rather than force.
Can I fit an anti-fog insert to a tinted K1 S visor?
Yes, as long as the visor is pin-ready. The insert sits on the inside and works the same way whatever the outer tint. Adding an insert does not change the legal status of the visor, which still depends on the marking it carries.
Does a new visor need to bed in?
A new visor can feel slightly stiffer or looser than the old one for the first few rides while it settles into the seal and mechanism. Cycle it open and closed a few times after fitting. If it still whistles or drops after that, refit both sides and check the mechanisms are clean.