RS125 (2018) - Motorcycle Honda - Free user manual and instructions
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| Product Type | Motorcycle |
| Brand | Honda |
| Model | RS125 (2018) |
| Category | Sport Motorcycle |
| Engine Type | Liquid-cooled 2-stroke single cylinder |
| Displacement | 125 cc |
| Bore x Stroke | 54.5 x 54.5 mm |
| Compression Ratio | 12.5:1 |
| Max Power | 26 hp @ 10,000 rpm |
| Max Torque | 19 Nm @ 8,500 rpm |
| Fuel System | Carburetor (28 mm) |
| Ignition | CDI |
| Transmission | 6-speed manual |
| Final Drive | Chain |
| Front Suspension | Telescopic fork, 120 mm travel |
| Rear Suspension | Pro-Link swingarm, 130 mm travel |
| Front Brakes | Single 296 mm disc, 2-piston caliper |
| Rear Brakes | Single 220 mm disc, 1-piston caliper |
| Tires (Front/Rear) | 110/70-17 / 150/60-17 |
| Dimensions (L x W x H) | 1950 x 700 x 1100 mm |
| Wheelbase | 1345 mm |
| Seat Height | 810 mm |
| Ground Clearance | 135 mm |
| Fuel Capacity | 14 L |
| Wet Weight | 135 kg |
| Battery | 12V, 6 Ah |
Frequently Asked Questions - RS125 (2018) Honda
What type of engine oil does the Honda RS125 require?
Use a high-quality 2-stroke oil that meets JASO FD or ISO-L-EGD standards. For the transmission, use 10W-40 motorcycle-specific engine oil, as the gearbox shares oil with the engine.
What is the recommended fuel for the RS125?
Use unleaded gasoline with an octane rating of 95 RON or higher. For 2-stroke models, pre-mix oil with fuel at a ratio of 1:50 (2% oil) unless the motorcycle has an autolube system.
How often should I perform maintenance on the Honda RS125?
Perform basic checks before each ride: tire pressure, chain tension, lights, and brakes. Change engine oil every 1,000 km or annually. Clean and lubricate the chain every 500 km. Replace spark plug every 5,000 km. Check coolant level and brake fluid every 6 months.
What tire pressure should I use for the RS125?
For solo riding, front tire pressure should be 32 psi (2.2 bar) and rear 36 psi (2.5 bar). For passenger or heavy load, increase rear pressure by 2-3 psi.
How do I adjust the chain on the RS125?
Place the motorcycle on a rear stand. Loosen the rear axle nut. Turn the chain adjuster bolts on both sides equally until the slack is 25-35 mm at the midpoint. Tighten the axle nut to 60 Nm. Re-check slack after tightening.
What is the idle speed for the RS125 engine?
The correct idle speed is 1,300-1,500 rpm when the engine is warm. Adjust using the idle screw on the carburetor.
What brake fluid type does the RS125 use?
Use DOT 4 brake fluid. Check the reservoir level and replace fluid every 2 years or if it appears dark or contaminated.
What coolant should I use for the RS125?
Use a pre-mixed ethylene glycol-based coolant with a 50/50 ratio of coolant to distilled water. Ensure it is suitable for aluminum engines.
Where is the Vehicle Identification Number (VIN) located?
The VIN is stamped on the right side of the steering head (if stock) or on the engine case near the front sprocket. It is also printed on the compliance plate.
How do I properly break in a new engine?
For a new or rebuilt engine, avoid sustained high rpm for the first 1,000 km. Vary engine speed and load, and do not exceed 6,000 rpm during break-in. Change oil after the break-in period.
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