Checks You Should Make
Before you hop on, check your bike!
Tyres

Pressure: Keep them pumped up to the correct pressure! Excessively low or high pressure in your tyres will decrease the bike's handling and braking, and may make it unpredictable. Tyre pressure should be checked at least once a week if riding daily or before every ride if riding less frequently. Service station gauges can often be inaccurate so it's a good idea to get your own trusted portable tyre gauge.
The bike type and usage affect what amount of pressure (usually measured in P.S.I.) you should fill the tyre to. Check the manufacturer's guidelines to suit the riding that you will do.
Tread: Tread depth determines how much rubber you have in contact with the road and how well water is moved away from the contact patch when it's wet. The less tread you have the less grip you have on the road and the less traction you have in the wet. Check the wear bar on the tyre tread. Replace the tyre when the tread is equal to the wear bar.
Damage: Check for nails, cracks or other imperfections on the tyre surface. Any damage could lead to a 'blowout' and could be extremely dangerous.
Chain

The chain needs to stay lubricated regularly to avoid excess wear and damage, which could become dangerous if not maintained. A rough rule of thumb is to do it every 600km but this can vary between bikes so make sure you get the right advice for your bike. Regular maintenance prolongs the life of your chain and sprocket, saving you dollars to spend on other things. Make sure you are careful not to get excessive lubricant on the tyres or on the brakes
Excessive chain slack caused by normal wear and tear will cause the sprockets to wear quickly and pose a big safety risk. Always check the user's manual for the correct tension of your chain. A quick check is to lift the chain with your boot before you ride. If it's too tight or loose then adjust it.
The sprocket teeth can be checked for wear visually (check for worn teeth), as well as the condition of the chain.
Oil

If the engine runs out of oil the engine may "seize", resulting in the back wheel locking up and loss of control, not to mention the possible catastrophic damage to the engine it would cause. Check the oil level regularly by following the manufacturer's directions.
Petrol

Check the petrol tank level, visually. Make sure you never ride with the fuel tap set to reserve, as you may need that reserve fuel one day! It's good to also use your odometer.
Brakes

Check that your brakes are in proper working order. This includes the brake lines, pads and other elements. On a motorcycle, the brake pads are quite easy to check compared to a car. The pads are usually visible on the bike as well as wear indicators.
Levers and Controls

Brakes: Try the front and rear brakes separately and make sure they work properly. It's important to regularly check that they activate the brake light.
Throttle and Clutch: Make sure these work smoothly and properly. They should quickly go back to the original position when released.
Cables and hoses: Check the brake, throttle and clutch cables for any imperfections, wear or kinks. Any of these could be extremely dangerous. Other things, like the throttle grip sticking, and not snapping back when released, can be hazardous.
Lights

Check that all lights, including indicators, headlights and break lights are working properly and that they are always clean.
Horn

The horn is there for your safety. Check that it works properly.
Mirrors

Your mirrors are very important to keeping that safe space around you when on the road. Make sure they are properly aligned and are in good condition for clear visibility.
All nuts tightened

A motorcycle engine will vibrate. Therefore, it's important to ensure that all nuts are tightened properly and that you keep an eye on areas of the bike that are likely to wear.
Electrics

Instruments and display lights must always function properly, including warning lights.
Battery
Quite a lot of mechanical problems for motorcycles and cars can be traced back to a malfunctioning battery in some way. Check the battery electrolyte levels regularly, as well as general cleanliness and fastening.
Leaks

It is not uncommon for anything mechanical to leak in some way. Second hand bikes and older bikes are much more likely to leak fluids and oils. It is important to keep an eye out for these leaks. Depending on the type of leak and its location, this could be very dangerous.
