BMW R1200GS

The German twin was the adventure datum when launched in 2004, has dominated ever since, and has now an affordable preloved buy

BATTERED BOXER

Pre-2010 bikes can leak oil where the gearbox and engine meet. If there are dribbles then walk away – it’s a big job to remedy. The finish flakes off the engine and it can corrode quickly, even on a GS that hasn’t seen winter riding – some cases have been so bad that BMW replace complete engines under warranty (though not for owners who confessed to using cleaning products that Beemer believe to be damaging). Have a good poke at the motor for loose finishes and signs of corrosion. And once you own the bike, always tell the dealer you use BMW’S own cleaning potions.

STICKY FLAPS

If the engine runs poorly it could be a seized exhaust throttle valve. They wedge in place on air-cooled 1200s due to overheating, and if it’s stuck in the closed position the boxer won’t perform properly. It’s something that’s affected boxer engines for yonks. The only solution is a replacement valve assembly at around £300. Later bikes with liquid-cooled heads suffer the same issue but it’s a pricier fix – the valve is in the front pipes and will cost over a grand. Oh, plus fitting...

MAINTENANCE

The GS needs a service every 6000 miles. The minor service includes an engine oil and filter change, an inspection of all the bike’s fluids, fasteners and components, plus it gets plugged in for a diagnostics check – budget around £175. The major service comes at 12,000 miles and includes all the above, plus fresh differential oil, replacement air filter and spark plugs, and a valve clearance check. Should come in for less than £400.