Cleaned regularly to prevent improper carb function. Spark Plug: Cleaned or replaced every 5,000 km. Drive Chain: Cleaned and lubricated every 500 km. 3. Engine Maintenance and Troubleshooting

Understand how to rebuild the top end or replace crankshaft bearings. Preventive Maintenance: Prevent common two-stroke failures. 3. Routine Maintenance Schedule

A healthy plug displays a light tan or biscuit-brown color. Black, oily deposits indicate a rich mixture or leaking crank seals. White or blistered electrodes signify a dangerously lean mixture.

The is more than just a repair guide; it is the definitive reference for maintaining a legend. By following the precise specifications and procedures outlined by Yamaha engineers, you can ensure that your RX 135 remains responsive, reliable, and powerful for years to come. Whether you are performing a simple oil change or a complete rebuild, having this knowledge at your fingertips is the key to preserving the raw spirit of the RX 135.

This chapter is the heart of preventative care. It outlines a detailed maintenance schedule based on average riding conditions, emphasizing that service should be performed more frequently under severe conditions. This section includes step-by-step procedures for:

Remove the spark plug, clean it, and check the gap. Replace if necessary.

A full diagram for checking lights, ignition, and horn functionality. Common Maintenance Procedures Using the Manual Replacing the Spark Plug

Clean soot deposits and adjust the electrode gap.

12-Volt system (later models) or 6-Volt system (early models). Always verify your battery and bulb ratings before replacement. Troubleshooting Common Faults Engine Will Not Start

Slowly turn the air screw counter-clockwise. Listen carefully to the engine note.

Align the punch mark on the stator base plate precisely with the index mark on the crankcase.

Over time, two-stroke engines accumulate carbon deposits on the piston crown, cylinder head dome, and exhaust port. This restricts exhaust flow and creates hot spots that cause pre-ignition. Steps to Decarbonize the Top-End Remove the seat, fuel tank, and spark plug.

Decarbonize the cylinder head and exhaust port, check clutch adjustment. Engine Transmission Oil Change

A common issue with RX 135s is incorrect jetting. The manual provides the stock settings: