Yamaha TT-R50EH TT-R50E 2017 Owner's Manual

Ensure the fuel valve is on, set the choke to the 'on' position if the engine is cold, and make sure the transmission is in neutral. Then press the electric start button.
Use a high-quality, 4-stroke engine oil with a viscosity of 10W-40. Ensure it meets the JASO MA standard for motorcycles.
It is recommended to change the oil every 6 months or every 1,000 miles, whichever comes first.
The recommended tire pressure is 15 psi for the front tire and 15 psi for the rear tire.
Check the battery for charge, ensure the fuel valve is open, verify the choke is correctly positioned for the engine temperature, and check for any loose electrical connections.
Inspect the air filter for clogs, ensure the spark plug is clean and properly gapped, and check the fuel system for any blockages or stale fuel.
Loosen the rear axle nut, adjust the chain tension using the adjuster bolts on each side of the swingarm, and ensure there is 1.2 to 1.6 inches of slack. Tighten the axle nut after adjustment.
Regularly check tire pressure, oil level, chain tension, brake function, and ensure all nuts and bolts are tight. Also, inspect the air filter and spark plug condition.
Remove the air filter cover, take out the filter, and clean it with a mild detergent and water. Allow it to dry completely before applying air filter oil and reinstalling it.
Signs include difficulty starting the bike, dimming lights, and a battery that does not hold a charge even after being fully charged.