Testing procedures for the Intake Air Pressure (IAP) sensor, Throttle Position Sensor (TPS), and Engine Coolant/Oil Temperature sensor.
124cc, 4-stroke, air-cooled, SOHC, single-cylinder.
Listen for the fuel pump prime when the ignition is turned key-on. If silent, check the fuel pump fuse and relay. Suzuki Uz125 Service Manual
If the scooter idles roughly, remove the air cleaner boot from the throttle body.
Before turning a wrench, you must know the exact fluid limits and technical dimensions of the UZ125. Using the wrong quantities can damage the engine or transmission. Specification / Type SAE 10W-40 (API SF/SG or SH/SJ with JASO MB) 950 ml (drain & change) / 1050 ml (with filter) Transmission Oil SAE 10W-40 or Engine Oil 90 ml (drain & change) / 100 ml (after overhaul) Spark Plug NGK CR6HSA or DENSO U20FSR-U Gap: 0.6 – 0.7 mm (0.024 – 0.028 in) Idle Speed Fuel Injected (Automated ECM Control) 1,600 ± 100 RPM Tire Pressure (Cold) Front: 1.75 kg/cm² (25 psi) Rear: 2.25 kg/cm² (33 psi) 2. Factory Maintenance Schedule Testing procedures for the Intake Air Pressure (IAP)
: If you ride in dusty, wet, or muddy conditions, the manual clearly states you must perform maintenance more frequently, especially for items like the air cleaner element.
| Interval (km) | Key Maintenance Tasks (Refer to Service Manual) | | :--- | :--- | | | First and most critical service: engine oil & filter change, valve clearance check, drive belt inspection, and general bolt tightening. | | Every 3,000-6,000 km | Regular service: engine oil & filter change, air cleaner element cleaning, brake inspection, and throttle cable lubrication. | | Every 6,000-12,000 km | Major service: spark plug replacement, final drive oil change (if equipped), CVT system inspection, and steering head bearing check. | | Every 2 Years / 10,000 km | Consumable replacement: drive belt replacement and brake fluid change. | If silent, check the fuel pump fuse and relay
Connect a jumper wire or a dedicated Suzuki switch tool between the Ground terminal and the Dealer Mode terminal. Turn the ignition switch ON.