SOURCE: Engine Monotonous sound from new yamaha gladiator ss 125cc
The sound is being caused by something mechanical. It is not likely to go away by it's self. It will probably get worse. Don't wait for the next service. Take it in now before any more potential damage can be done. Check the oil level in the gearbox. It could be low.
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SOURCE: Yamaha gladiator ss valve cleareances
Noise seems to be generating from the rocker arm of the valve adjustment. You have to do valve adjustment only when the engine is in cold condition. ie room temperature.
At this point slip a feeler guage & adjust. first loosen the rocker arm hexagon lock nut & try adjusting the valve pressing post. You may require special tool for this!!
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