: Liquid-cooled, 4-stroke, single-cylinder, DOHC [13, 17]. Displacement : 124.4 cm³ [13]. Maximum Power : 11 kW (15 hp) at 10,000 rpm [13].
Without the manual, you are buying random parts ($200 ECU, $150 sensor). With the manual, you diagnose it in 10 minutes. gsx r125 service manual
The GSX-R125 requires valve clearance checks every 7,500 miles (12,000 km). The intake valves are notoriously prone to tightening up over time. The manual walks you through removing the air box, setting the #1 cylinder to TDC (Top Dead Center), and using feeler gauges to check the .10mm–.20mm clearance. Without the manual, you risk bending a valve. : Liquid-cooled, 4-stroke, single-cylinder, DOHC [13, 17]
: Capacity is approximately 1.5L for a full overhaul or roughly 1.3L for a standard change [6]. Use 10W-40 4T semi-synthetic oil [30]. Without the manual, you are buying random parts