Joyor S10-S-Z · Tyres & wheels

Tyre loses air over a few days

The tyre goes soft slowly. Often the valve, not a hole, and sometimes a five-minute fix.

Difficulty: EasyTime: 15–30 minutes5 things you need

Is this your problem?

  • Tyre is fine after pumping but soft again a few days later
  • Range feels shorter and steering heavier than usual

Likely causes

1
Loose or dirty valve coreHow to tell: Soapy water on the valve tip makes bubbles.
2
Tiny hole in the tubeHow to tell: Bubbles somewhere on the tread, or no bubbles outside at all.
3
Valve cap missingHow to tell: Dirt gets into the valve and stops it sealing.
Check this first

Pump to the sidewall pressure, spray soapy water on the valve tip and around the valve base. Watch for 30 seconds.

What you need

Tools

Example photo: Spray bottle with soapy waterExample photo
Spray bottle with soapy water

Water with a squirt of washing-up liquid. Bubbles show exactly where air escapes.

Photo: Kaviyadharshini Selvakumar, CC BY-SA 4.0, resized
Example photo: Valve core and core toolExample photo
Valve core and core tool

A Schrader valve core tool (a few euros) and a spare core. A loose core is a common cause of slow leaks.

Photo: Andrew Pertsev, CC0, resized
Example photo: Pump with a pressure gaugeExample photo
Pump with a pressure gauge

A floor pump with a gauge. Scooters like this one normally have a car-style (Schrader) valve: check yours and make sure the pump head fits it.

Photo: Ewok Slayer, Public domain, resized
Example photo: Tyre pressure gaugeExample photo
Tyre pressure gauge

Any gauge that fits your valve. The gauge on a cheap pump can be off by a lot, so a separate one is worth it.

Photo: Simon Speed, CC0, resized

Parts

Example photo: Valve core and core toolExample photo
Valve core and core tool

A Schrader valve core tool (a few euros) and a spare core. A loose core is a common cause of slow leaks.

Photo: Andrew Pertsev, CC0, resized

Photos show the kind of tool or part, not a specific product. We don’t sell anything and get nothing from any shop.

Step by step

Tap a step when it’s done to keep your place.

  1. Pump up and spray the valve

    Pump to the pressure written on the sidewall. Spray soapy water onto the valve tip. Growing bubbles mean the core is leaking.

  2. Tighten the valve core

    Put the valve core tool in and turn it clockwise gently, just snug. Spray again.

  3. Replace the core if it still bubbles

    Let the air out, unscrew the core anti-clockwise, screw in a new one, pump back up. A new core costs very little.

  4. Spray the tyre

    If the valve is dry, spray the whole tread and sidewalls, turning the wheel slowly. Bubbles show a hole. That means a new tube (see the flat-tyre guide).

  5. Fit a valve cap

    Always. It keeps dirt out of the core.

When to take it to a shop

If you find a hole and do not want to take the wheel out.

Also check

Tyres & wheelsFlat tyre or punctureThe tyre is soft or fully flat. On this scooter that almost always means a new inner tube.Tyres & wheelsWhat pressure should my tyres be?Read it off the tyre. Joyor does not publish one number for this model, and tyres differ.

Written for the Joyor S10-S-Z using the maker’s published specs and error list (Joyor technical guide) plus general repair practice for scooters built this way. Parts and fittings can change between production batches: if yours looks different, trust your scooter and its manual. Repairs are at your own risk.

Found a mistake? Tell us.