This is the maintenance schedule and service intervals for the Suzuki GSX1400, Suzuki’s big naked bike that’s reminiscent of the UJMs of the 1980s.
The Suzuki GSX1400 is a big bruiser of a four-cylinder bike. It’s based on a 1402cc air/oil-cooled fuel-injected inline four-cylinder engine with a mild 9.5:1 compression ratio.
It makes peak power of 78 kW (105 hp) at 6800 rpm, but massive torque of 126 Nm (93 ft-lb) at 5000 rpm — so peak power is limited by its ability to rev high as an air/oil-cooled engine (despite the huge oil cooling radiator up front).
Despite the similarity in engine size, the GSX1400’s engine is not related to that of the Gen 1 Hayabusa of its time (which had a liquid-cooled engine).
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Maintenance schedule for the Suzuki GSX1400
Below is the maintenance schedule for the Suzuki GSX1400.
- Break-in maintenance is omitted (haven’t you broken it in yet?)
- The schedule says you should do many things on 6-monthly intervals — use your judgment (more recent manuals only specify fluids and rubber parts should be replaced every few years, but you don’t have to check most things on a time basis if it hasn’t been ridden)
Despite being an air/oil-cooled engine, valve services in the Suzuki GSX1400 are pretty widely spaced — every 24000 km (15000 mi). Of course if you hear a noisy valvetrain, use your judgement about getting it serviced earlier.
- I = Inspect and adjust, clean, lubricate, or replace as necessary
- R = Replace
- T = Tighten (re-torque)
|km x 1000||6||12||18||24|
|miles x 1000||4||8||11||15|
|Air cleaner element||I||I||R||I|
|Spark plugs||I||R||I||R||NGK CR8EK.|
|Engine oil||R||R||R||R||Use Motul 5100 10W-40|
|Engine oil filter||–||–||R||–|
|Fuel line||I||I||I||I||Replace every 4 years|
|Throttle valve synchronization||–||I||–||I|
|PAIR (air supply) system||–||I||–||I|
|Throttle cable play||I||I||I||I|
|Clutch hose||I||I||I||I||Replace every 4 years|
|Clutch fluid||I||I||I||I||Replace every 2 years (Castrol DOT 4)|
|Drive Chain||I||I||I||I||Clean/ lubricate every 1000 km (600 mi). (Motul chain care kit)|
|Brake hoses||I||I||I||I||Replace every 4 years|
|Brake fluid||I||I||I||I||Replace every 2 years (Castrol DOT 4)|
|Exhaust pipe bolts and muffler bolts||–||T||–||T|
|Chassis bolts and nuts||T||T||T||T|
About the Suzuki GSX1400
The GSX1400 is an iconic classic — one of a now-extinct breed of air/oil-cooled inline four cylinder bikes, tuned for mid-range torque rather than anything else.
Suzuki built the GSX1400 as an answer to what it perceived as dwindling demand for the “ultimate sportsbike”, despite having released their own Hayabusa to the public just a couple of years earlier.
But the GSX1400 is a very different bike to a liquid-cooled hypersports bike. For one thing, it has an air/oil-cooled engine — that massive radiator up front is for the oil!
The engine is actually based on the Suzuki GSX1100 engine from the 1980s, but with bigger bore and stroke and fuel injection. It was quite a modern design, with 16 valves and dual overhead cams even back then.
The GSX1400 is quite well equipped for a generally low-tech bike. The front brakes are sportbike-spec six-piston calipers biting 320mm discs, and the suspension is fully adjustable on both ends. Up front there are beefy 46mm forks (right way up) and at the back there are dual shocks with piggyback reservoirs.
Despite the bike’s considerable weight (around 250 kg or 550 lb fully fuelled), the Suzuki GSX1400 never feels “slow”. You feel the weight at a standstill, but because of the handlebar setup, it’s not hard to move around in slow situations.
The handling is good considering its weight and the fact that it’s not meant to be a high-speed, knee-down cornering machine.
What’s maybe very important about the Suzuki GSX1400 is that it was gorgeous at launch, and decades later it still looks breathtaking.
Manual for the GSX1400
The above maintenance schedule came from the service manual for the GSX1400.
You can find copies at a few forum/fan sites or you can see it on (and download it from) Manualslib here.