8 min read · updated 2026-10-15

Buying a used air-cooled fuel-injected bike: what to check

For air-cooled FI bikes such as the Yamaha FZS FI V2 and V4, Fazer FI, Suzuki Gixxer FI ABS and Gixxer SF 155, Honda Hornet 2.0, SP160 and Hero Xtreme 125R. The usual papers and body checks, plus the FI warning light, fuel pump and sensors.

What you need

A torch, a clean rag, and a friend or mechanic who knows bikes
Your licence and helmet for the test ride

Steps

Ask for the papers before you even look at the bike: the BRTA registration certificate (smart card, or the older blue book), the tax token, the insurance paper and the seller's NID. Motorcycles do not need a fitness certificate, so that is not one to look for.
Match the name on the registration to the seller's NID. If the bike is in someone else's name, the registered owner must sign the ownership transfer with you. Without that signature BRTA will not move the bike into your name.
Read the chassis number (stamped on the frame, usually near the steering head) and the engine number (on the engine case). Both must match the registration exactly. Filed, re-stamped, painted-over or uneven digits are a reason to walk away.
The number plate should be the BRTA-issued digital (retro-reflective) plate with the same number as the papers. A hand-made or mismatched plate needs a clear explanation.
Check the tax token's expiry date. If it has lapsed, the arrears and fines usually land on whoever owns the bike next, so agree who pays before any money changes hands.
Ask whether the bike has pending traffic cases or e-fines, and check yourself on the official online service before paying (our e-fines guide shows how). Unpaid cases follow the bike.
Write a sale receipt with both NID numbers, the date, the price and the chassis and engine numbers, signed by both of you. Then do the ownership transfer at BRTA soon. Until it is done, the bike legally stays in the seller's name.
Key on, engine off: the FI warning light (an engine symbol, sometimes marked FI) should come on briefly as a self-check, and you should hear the fuel pump hum for a moment under the tank. If the light never comes on at all, the bulb may have been removed to hide a fault.
Ask the seller not to start or ride the bike before you arrive, and touch the engine when you get there. It should be cold. A warm engine hides hard starting, smoke and noises.
Start it and watch the exhaust, then rev it a few times. Thin white vapour on a cool morning that clears in a minute is normal. Blue or grey smoke means it is burning oil (worn rings or valve seals). Black smoke means it is running too rich.
Listen at idle and as it warms. A light, even ticking is normal. Loud tapping from the top, knocking from the bottom, a rattle for the first seconds after start-up, or grinding are not. Look for oil seeping around the cylinder head and the base of the cylinder.
Hard starting together with weak pulling and blue smoke points to a tired top end (low compression). A mechanic can measure compression with a gauge in a few minutes.
No choke on FI: it should start on the button within a few seconds even when cold, with a slightly higher idle that settles by itself as it warms. Long cranking, stalling at idle or surging revs point to a dirty throttle body, an idle control fault or a weak fuel pump.
After starting, the FI light must go out and stay out for the whole test ride. A light that stays on or flickers means the ECU has stored a fault.
Ask for a fault code reading at the brand's service centre before you pay; their diagnostic tool reads stored codes quickly. Some models can also show codes on the dash; the owner's manual explains how.
Feel for sensor trouble on the ride: jerky throttle at low speed, hesitation when you open it, a temperature reading that never moves, or 'mileage has dropped lately'. Throttle position, oxygen and temperature sensors are common culprits. They are fixable, but price them in.
Look under the seat and around the throttle body and ECU for cut, taped or joined wires, or an add-on box. A bypassed sensor or cheap tuning module can cause faults later. FI also needs steady voltage, so check the battery's age and that it cranks strongly.
Clutch slip test: in a high gear at low speed, open the throttle quickly. If the revs jump but the bike barely speeds up, the clutch plates are worn. It should also find neutral easily, and the lever should have a little free play.
Chain and sprockets: try to pull the chain backwards off the rear sprocket. If it lifts away and shows a big gap, the chain is stretched. Hooked or pointed teeth mean the chain and both sprockets are due.
Accident signs: scraped bar ends, levers, footpegs, mirrors or engine cover; dents in the tank; new panels that do not match the rest; welding or fresh paint on the frame. Stand in front and behind: both wheels should line up, and the handlebar should be straight when the front wheel is.
Forks and steering: look at the shiny fork tubes for oil, rust or pitting. Push down on the front a few times; it should rebound smoothly, without clunks. Turn the bar from lock to lock; it should move smoothly, not notchy or loose.
Flood damage, common after the monsoon: dried mud or silt where washing does not reach (under the seat, in the air box, around wiring plugs, behind the headlight), green or white crust on connectors, rust on bolts low on the bike, fog or a water line inside the headlight or meter, a musty smell, and milky engine oil.
Odometer: do not trust the number alone. Both mechanical and digital meters can be wound back. Compare it with the service book stamps and with wear on the grips, footpeg rubbers, gear lever, brake pedal, seat, tyres and chain. Very low kilometres with worn rubber and a stretched chain do not add up.
Test ride with your licence and a helmet on a quiet road. Use every gear up and down, brake firmly once from moderate speed, ride straight with a light grip to feel any pull to one side, and check the horn, lights, indicators, self-start and kick start if fitted.
Before paying, have a mechanic you trust look it over, not one the seller brings. If anything above worried you, use it to lower the price or walk away.

Common mistakes

Jumping at a price far below the usual used price for that model and year. The common reasons are a stolen bike, flood or accident damage, or papers that are missing or cannot be transferred. Be extra careful, or walk away.
Paying an advance to 'hold' the bike before you have seen the original papers and matched the numbers yourself.
Buying on 'the papers will come later', or with only a photocopy of the registration.
Inspecting at night, in the rain or right after a wash. Water hides leaks, and darkness hides dents and smoke.
Accepting 'the light comes on sometimes, it is nothing'. Get the codes read before you pay.
A short test ride only. Codes cleared just before you arrive can take a while to come back, so ride long enough for the engine to fully warm up.

When to go to a mechanic

Always, before you pay. A short inspection costs far less than buying the wrong bike.
Blue smoke, knocking, clutch slip or a bike that pulls to one side: get a compression test or frame check and price the repair before you agree.
The FI light stays on, or it hesitates or stalls even with a clean air filter and fresh petrol: get a diagnostic check at the service centre.

This is general guidance for typical commuter motorcycles. Your owner's manual is the final word on pressures, intervals and oil grades for your bike. If you are unsure, ask a trusted mechanic.