Engine is the heart of bike that should be looked after time to time. To maintain the engine following method should be followed.
Check the oil and replace it at interval of 4000-5000 kms. If you dont remember when did you replace the oil last time then check the oil thickness. If the oil is not thick then it should be changed.
Always use qualified fuel. Dont use the mixed fuel or low quality fuel. It may create problem in bike performance.
Check the tyre pressure. If the pressure is low then get the pressure filled. Low pressure puts extra load to your bike engine.
Chek the chain. It is very important to check the chain as it transfers the engine energy to your rear wheel. Loose chain will decrease your bike milage and puts extra load to the engine.
Bikes air filters should be checked time to time. Bike needs pure air to generate power. So prevent clogging of dust particles in the air filters.