Used Motorcycle Inspection — A Checklist That Catches Problems

Inspecting a used motorcycle properly takes about thirty minutes. Most buyers don’t bother because they don’t know what to look for. This guide is the structured routine our team uses on every bike that comes into the showroom.

Work through it in this order — frame, engine, transmission, electrics, paperwork. Each section flags what’s a hard “walk away”, what’s a negotiation point, and what’s normal wear.

1. Frame and chassis (the structural truth)

Before you touch the engine, look at the bike as an object.

Check:

• Steering head bearings. Front wheel off the ground (paddock stand), turn the bars lock to lock. Should feel smooth, not notchy in the centre. Notch in the centre = bearings worn. £150–250 to replace.
• Frame straightness. Stand behind the bike and look down the spine. The forks, frame, swingarm and rear wheel should all be in a straight line. Crash damage shows as misalignment here.
• Swingarm pivot. Grab the back wheel and rock side to side. Movement at the pivot = bushes worn. £100–200 to fix.
• Drop indicators. Look at bar ends, brake/clutch lever ends, mirrors, foot pegs, and engine case bottom. Scuffs on TWO of these in a similar plane = the bike was dropped. Doesn’t kill the deal — does inform price.

Hard walk-away: any sign of weld repair on the frame, headstock, swingarm. Replating doesn’t count — actual repairs to structural metal = sell, don’t buy.

2. Engine (the expensive bit)

Cold start. Always. A bike started ten minutes before you arrive hides smoke, rattle, hard starting, and idle problems.

Ask the seller not to warm the bike before you arrive. If they have, give the bike at least an hour to cool down.

Check:

• Cold start crank. Should fire on the first or second crank attempt. Slow cranking = battery; multiple crank attempts = ignition or fuelling issue.
• Initial idle. Should settle within 30 seconds. Hunting idle = vacuum leak, throttle body sync needed, or fuel issue.
• Smoke colour at startup. Blue = oil burning (rings, valve guides). White = water (head gasket, cracked block). Black = over-fuelling (carb/injection, possibly intake leak).
• Rattle / knock. Top-end (head) rattle that goes away when warm = often valve clearance. Bottom-end knock that gets WORSE when warm = serious. Bottom-end knock = walk away.
• Oil level + condition. Pull the dipstick or check the sight glass. Should be on the mark, oil should be clean (not gritty, not milky). Milky oil = water mixing with oil = head gasket.
• Cooling system (water-cooled bikes). Look at the coolant in the reservoir. Should be coloured (green/blue/red depending on type) and clear. Cloudy or with film on top = compromised.

Hard walk-away: bottom-end knock, milky oil, water in the airbox, broken cooling system.

Negotiable: smoke that clears within 30 seconds, top-end rattle, idle that needs adjustment.

3. Transmission and final drive

Check:

• Clutch action. Pull the lever. Should be smooth, with a clear bite point. Slipping clutch under load (test ride: third gear, 30 mph, full throttle — should pull cleanly without RPM climbing without speed) = clutch worn or oil contaminated.
• Gear engagement. Cold and hot. Should drop into gear without crunch. Difficult to find neutral = often clutch drag, sometimes worn selector forks.
• Gear changes at speed. Test ride is essential. Each gear should engage cleanly. Jumping out of gear under load = worn dogs, expensive.
• Final drive. Chain (most bikes) or shaft (BMW R-series, some Hondas, some Yamahas).

Chain check: at the 4-o’clock position on the rear sprocket, pull the chain away from the sprocket. If it lifts more than half a tooth, the chain is shot. Replacement is the chain AND the sprockets together — £80–200 fitted depending on bike.

Shaft drive: check for play in the rear hub, listen for whining at constant speed. Shaft service intervals are long but expensive — verify when the last service was.

4. Brakes and suspension

Check:

• Brake pad thickness. Look through the calliper — should be at least 3 mm of pad material. Worn pads are £30–60 fitted, no panic.
• Disc wear. Run a finger around the OUTER edge of the disc. If there’s a noticeable lip where the pad doesn’t sweep, the disc is worn beyond minimum. Disc swap is £100–200 each.
• Brake fluid. Should be honey-coloured. Black = neglected, needs flushing (£40).
• Suspension feel. Push down on the seat firmly. Should rebound once cleanly. Multiple bounces = damping shot. Suspension service is £200–400 depending on bike.
• Fork seals. Wipe the fork stanchions. Oil residue = seals leaking, MOT failure, £150–250 to fix.

5. Electrics

Check:

• All indicators, brake light, headlight (high + low), instrument cluster lights. Anything not working = MOT failure.
• Charging system. With the bike running at 3,000 RPM, headlights should be steady (not pulsing brighter/dimmer). Multimeter at the battery should read 13.5–14.5 V at fast idle. Below 13 V = regulator/rectifier going.
• Wiring. Look under the seat and at the rectifier. Heat damage to wiring/connectors is common on Suzukis and Hondas — a melted connector is fixable but indicates the bike’s worked hard.
• Battery. Date code on the battery. Anything older than 4 years = nearing replacement (£60–100).

6. Paperwork (the litmus test of seriousness)

This is where the seller’s honesty really shows.

Check:

• V5C registration document. Match the frame number on the V5 to the bike. They should be identical. Check the previous owner count.
• Service history. Stamps in the book, receipts, invoices, dealer printouts. The more granular the better. Be VERY suspicious of “service history but it’s at home” — ask to see proof on the spot or come back.
• MOT history. Look up online at gov.uk — free. Past mileage should track sensibly (no jumps backwards, no impossibly low usage years suggesting a clocked odometer).
• Receipts for major work. Tyres, chains, batteries, fork seals — any major work in the last year should have a receipt. Owners who looked after the bike kept receipts.
• Keys. Two keys are expected. One key = the owner lost the spare or never had it. New key cut + program is £80–250 depending on bike.
• HPI check. Run one yourself (£10–20) or buy from a dealer who provides one. Checks for outstanding finance, theft, write-off categories.

Hard walk-away: mismatched VINs, missing V5, MOT history shows a clocked odometer, outstanding finance.

What a bike looks like that passes

A good used motorcycle is one where:

• The seller is happy for you to inspect everything
• The cold start is clean and the idle settles fast
• Documents match the bike and tell a consistent story
• Wear items (chain, tyres, pads) match the claimed mileage
• The previous owner cared (clean engine cases, intact paint, no missing fasteners)

A bike that’s been LOOKED AFTER usually looks the part. The opposite is also true.

Where TH Motors fits

Every bike at TH Motors goes through this exact inspection routine — and a more detailed pre-sale service — before it reaches the showroom. The free HPI check (certificate provided), 6-month warranty and minimum 6 months MOT do the boring-but-essential parts for you.

Browse the current showroom, the CBT bikes, the A2 selection, or specific brands like Honda and Yamaha.

If you want to go through any bike with us in detail before committing, that’s exactly what an appointment is for.