Questionnaire:
1. How has the motorcycle been maintained? Are there any maintenance records?
2. What’s the VIN? (To check if it is clean or stolen)
3. How long have you owned the motorcycle?
4. Have you ever crashed the motorcycle?
5. Are any extras included?
6. What aftermarket parts have been added?
7. What’s the mileage? (Just in case)
8. Can I take the motorcycle for an inspection?
9. Do you have the title? (Or Is the title in your name? Is it clean?)
INSPECTION
1. Ask the seller to have the engine cold (Do not run it). Inspect the exhaust pipes for leaks or corrosion. Start the engine. How it sounds? Is there any strange sound coming from the exhausts? Also, dents in the exhaust header can cause performance issues. Be sure to inspect it from underneath.
2. Overall appearence. It’s easy to tell the difference between a bike that’s just been “quick cleaned” for a sale and the one that’s been garage kept and pampered by a true enthusiast. Check all the tight spots. You know the hard to reach places where dirt can accumulate. The enthusiast will take the time to get into these areas and keep his bike looking showroom. The “quick cleaner” will not If the bike has plastic fairings, check the “tabs” that connect them to the frame. The first thing to break when a bike has been crashed is usually these connection points, and shoddy repair attempts can be easily spotted.
3. Frame. Look closely. You’re looking for dents, scrapes, cracks. Is there any indication the bike has bottomed out, taken a hard landing or been in some kind of accident? Get hands on with the frame too. Slide your hands over as much of the frame as you can. You may feel something you can’t see. Check the steering head bearings. While holding the front brake lever, rock the bike back and forth. If you feel movement or hear a clicking sound, it’s a good indication that the bearings in the steering head might be loose or worn. Place your hand over the upper triple clamp and frame to feel the movement. Check the steering stops on the neck of the frame. This is the metal stop that meets the tabs on the lower steering stem to stop the handlebars from turning. If you see that the metal is bent, bulging or excessively rusty, this can be an indication that the bikes was involved in a crash.
4. Clutch. A little slack in the clutch cable is normal and any excess can usually be adjusted out. Squeeze the clutch in. Is it smooth? Release the clutch slowly. It should release smoothly. You should not feel any “snags” or “pops” as the clutch lever is engaged or released. Have a seat on the bike. Engage the clutch. The bike should roll smoothly with little resistance while in first gear with the clutch engaged. The clutch lever should have some free play before it engages, if not there is a higher chance of excessive wear on the clutch.
5. Brakes. While sitting on the bike, take it out of gear and roll it forward. Gently apply the front brakes. The brake lever should operate smoothly and the bike should slow to a stop with little to no noise from the brakes. Release the brake lever. It should return smoothly into position and the bike should now roll freely with no dragging of the brake calipers. If they drag, they need work. While braking at speed you should not feel any pulsing in the lever as this would indicate a bent rotor.
6. Suspension. While straddling the bike, shove down on the front end. The forks should return to position slowly and almost silently. Any loud noise can be bad news. Look at the fork seals. They should be clean and smooth. There should be no fork oil on the tops of the seals or on the forks. If there is a bit of oil around the fork seals the bike may just need new seals which are relatively affordable. But if there are nicks or rust on the fork tubes a more serious repair is needed. The forks themselves should be clean, shiny and smooth. Bounce up and down on the seat. The rear shock(s) should offer some resistance and return the rear end to normal position without springing up and down. Run your fingers up and down the fork tube. If you feel any bumps it is most likely rust. If you feel a crease, it means the fork has been bent at one time, most likely the result of an accident.
7. Chain and Sprocket. Check the tension of the drive chain by pulling it away from the rear sprocket at the three o’clock position. You should not be able to pull it farther than about halfway off the sprocket tooth. Any farther and it’s time to replace. The inner area of the chain that contacts the sprocket should be clean, smooth and shiny. Other things to look out for are links that are binding or kinked. This will cause tight spots in the chain and subsequently enhanced excessive wear on the drive train. If you can put the bike on a stand and spin the rear wheel you can easily see if the chain maintains the same tension as it turns. In addition, keep your eyes out for excessive rust. Small amounts can be easily removed but large amounts can mean it’s time for a new chain. Check the sprockets closely. Look for sprocket teeth that are hooked, pointed or chipped. If the teeth on the sprocket are leaning over, both the sprocket and the chain have excessive wear and should be replaced.
8. Tires and Wheels. Smooth even wear should be expected and is no cause to worry. Severe wear on the center third of the rear tire could be an indicator of long-distance freeway riding or performing “burnouts”. The latter is definitely not good for the tire but also causes unnecessary abuse on the engine. Excessive hard braking and skidding can cause flat spots on the tire. Check the 4 digit DOT numbers on the outer sidewall of the tires. The first two digits indicate the week the tire was manufactured, the second two digits indicate the year. Most recommend replacing tires when they are 6 years old, even if they appear to be in good condition. Inspect the wheels for dents. If possible, place the bike on the center stand with the transmission in neutral and spin the back wheel. Watch it from both the side and the rear to identify dings or bends in the wheel. The same can be done with the front wheel using the kickstand and some help from another person. Cupping is a natural wear pattern on motorcycle tires. It is not a sign of bad tires or suspension parts. It simply shows that the tire is gripping the road (thank you Mr. Tire!). This cupping develops on the sides of a tire. The forces that come into play when the motorcycle is leaning while turning are what produce the effect. When the tire becomes quite worn, the rider will experience vibration and noise when leaning into a turn. The softer compound tires tend to cup sooner.
9. Fuel Tank. Open the fuel cap and look inside. You may want to bring a flashlight with you. You should be looking through a light amber-colored fuel and clearly see the bare metal interior of the fuel tank. If the fuel is dark it’s probably old and should be drained and replaced. You’ll also want to flush the system and change the filter just to be safe. When inspecting the fuel tank you want to look for rust or any grit or sediment in the tank. If you’re not sure if you’re seeing sediment, rock the bike gently from side to side and set up a small “wave motion”. If there’s sediment you’ll see it shift from side to side. If the tank is full be careful not to overdo it. You want to keep the fuel in the tank. Some fuel tanks may have a coating applied to them to prevent or even cover old rust. In this case you will not see a shiny silver surface but more likely a light milky surface.
10. Coolant. The normal appearance of coolant is neon green and should smell sweet. With the engine cold, remove the coolant cap and take a look. Green is great. Brown-colored coolant could mean either rust or oil has invaded the engine. If the engine has begun to rust, you will want to consider some costly repairs in the future. If you have oil in your coolant you may have a leaking head gasket or failed O-rings. O-ring repair is not a death warrant for a bike but fixing a head gasket is a job for an expert “gear head”, so you may want to reconsider your purchase if this condition exists. Removing the radiator cap (cold engine only) will quickly tell you if you have any oil in your system. Since oil is lighter than water most of the oil in your cooling system will float to the top of your radiator. If you see an oil slick floating on your coolant there could be engine problems.
11. Oil. If the bike has a sight glass on the side of the engine you can see immediately the color of the oil. If the sight glass is discolored or brownish, the oil may have begun to “varnish” the engine interior. This is caused by not keeping up on frequent oil changes. If there is no sight glass, use a stick, cloth, paper towel or other such item and dip it into the oil via the filler cap. Clean syrupy-looking appearance is new oil. It’s been changed recently. If the oil is black, you’ll want to ask when the oil was changed last. So, new oil and black oil is normal. What isn’t normal? Water and oil don’t mix. If the oil has white milky streaks in it, water is getting into the engine.You may not want to purchase a bike with this problem unless you’re ready to tear down the engine. Oil impedes wear on an engine but does not fully prevent it. Normally, unless the oil has been recently changed you may feel a very slight grit when you rub a drop between your thumb and forefinger. If you feel or see shiny metal flakes in the oil this is very bad news. This engine is eating itself from the inside out. You do NOT want this bike.
12. Cold Start. Alright, you’ve looked the bike over carefully and you’re ready to hear it run. Each bike has its own cold start temperament and you will eventually get to know yours. Make sure the fuel petcock is turned to the “on” or “reserve” position. Depending on the bike you may have an electronic choke that requires no manipulation or you may have a manual cable type choke. If it’s manual, ask the seller to set it at his preferred setting. He’ll be happy to set it for you. He wants it to want it to start right up for you. Ask him how much throttle he normally gives the bike on startup. If it has an electric starter, use it. Once the engine is running, return the throttle to its normal position. You don’t want to “redline” a cold engine. While the bike is warming up, take the time to notice. Is it running smoothly? Is the engine chugging? (Maybe not enough choke). Look behind you. Is the bike smoking? If your bike is running a fuel/oil mix, (dirt bike) a little smoke is not unusual. If it’s smoking a lot, it could be a fuel/oil ratio mis-match or a timing issue. A street bike should not be smoking. Depending on the color of the smoke, a smoking street bike could mean trouble. Dark smoke and a heavy fuel smell is probably just a fuel/air ration problem and can be adjusted away. Blue smoke is burning oil. You should probably walk away from this bike. White smoke or steam can be coolant in the exhaust which is most likely due to a leaking head gasket (major repair needed). Listen to the engine. Do you hear any knocking, rattling, pinging etc.? It should be smooth and clean sounding. If you happen to own a mechanic’s engine stethoscope then by all means, bring it with you. It’s like what a doctor would use but has a long metal probe on the end rather than that icy cold cup we’ve all gotten to know and love. Most people don’t own one of these but an old friend taught me a simple trick for listening deep into an engine. Bring a wooden dowel rod with you when come to look at the bike. This is also handy for checking the oil as mentioned earlier in this writing. Touch one end to the engine and place your ear against the other. Internal sounds will be transmitted through the rod and you’ll be able to hear it from the other end. Place the rod in several locations on the engine and listen carefully. A couple of words of caution. Make sure the rod is long enough so that you don’t lean into a hot engine. Also, if you used the rod to check the oil’s condition earlier, don’t stick the nasty end in your ear!
13. Electrical. Check the headlights on both high and low beams. Sit on the bike and run through all the switches including the blinkers, horn, hazard lights and others to verify they are in working order. Pull the front brake lever and press the rear brake pedal to make sure the brake lights are operable. Check all the gauges for proper function. While idling, if the headlight should get dim it is most likely caused by either the idle being set too low, or it could be a weak battery.
14. Background check. Ask for all the service records and receipts for the bike. The thoughtful rider will save all service records. Perhaps the seller is the “do it yourself “type. This is not necessarily a bad thing. One of the best used motorcycles I ever bought was off an avid club racer/mechanic. The thoughtful “do it your self-er” should have receipts and records of all repairs. We also recommend that you get an official Motorcycle History Report. It’s inexpensive “peace of mind” when buying.
15. Title/Registration. Finally, carefully check the bike’s VIN number and license plate number against the title and make sure they match what’s on the title. The VIN number is usually located on the steering head of the frame. Make sure all the numbers are visible and none have been tampered with. Check the title to make sure there isn’t a lien holder. If there is they should have signed off their portion. Of course if the seller doesn’t have the title it’s not advised that you should make the purchase. The last thing you want is to buy a bike you can’t register, so avoid Curbstoners. If the bike doesn’t have a current registration or sticker or if it’s registered in another state you should contact the appropriate State Department to determine what the fees might be to register and bring it current.
16. Safety Check. Finally, once you’ve made your purchase, have your bike inspected by a qualified motorcycle mechanic. The vehicle’s safety should always be your primary concern.
Source: https://motorcycleshippers.com/2015/01/buying-used-motorcycle