Honda CBR300R 2021 Manual
![Honda CBR300R 2021 Motorcycle manual cover](/images/OwItKlswiPhkoMSYMQhcbibs/thumbs/thumb175x175.webp)
The recommended oil type for the Honda CBR300R 2021 is SAE 10W-30, API classification SG or higher.
If your CBR300R won't start, check the battery connections, ensure the fuel supply is on, and inspect the spark plug for fouling.
The recommended tire pressure for the CBR300R is 29 psi for the front tire and 29 psi for the rear tire.
Regular maintenance should be performed every 4,000 miles or every 6 months, whichever comes first.
To adjust the chain tension, loosen the axle nut, adjust the chain adjusters evenly on both sides, and then tighten the axle nut to the specified torque.
The recommended fuel grade for the Honda CBR300R is unleaded petrol with a pump octane number of 86 or higher.
To improve braking performance, regularly check and replace the brake pads if necessary, and ensure the brake fluid is at the correct level and is not old.
If your CBR300R overheats, stop the engine immediately, allow it to cool, check the coolant level, and inspect the radiator for obstructions.
To replace the air filter, remove the seat and the air filter cover, then replace the old filter with a new one, ensuring it is seated properly.
For long-term storage, clean the motorcycle, top up fluids, disconnect the battery, and store it in a cool, dry place, ideally on a stand to prevent tire deformation.