A Rental Bike Left Unused for Two Weeks: What Honda Manuals Say to Check Before Riding

A motorbike unused for two weeks in Hanoi may start slowly or feel different when its renter comes back to it. Neither of the two Honda Vietnam owner’s manuals read for this article names a two-week period, but both describe the start-up checks and warning signs that matter after a bike has stood still: the inspection they ask for before every ride, tyre and battery checks, the starting routine and the points at which they send the bike to an authorised workshop. They address owners rather than renters, a gap taken up at the end.

What the manuals say about a bike left standing

Honda Vietnam’s manuals for the NSC110CBF and for the ACA160CAF and ACA125CAF/CBF each have a storage section for a bike that will not be used “for a long time”, without saying how long that is. Both suggest a full cover if the bike stays outdoors, washing and protecting the paint, and putting the bike on its centre stand on a support so neither wheel touches the ground. On the battery, both say to remove it to prevent voltage loss, charge it fully and keep it somewhere cool and ventilated; both also say to disconnect the negative lead to prevent discharge, the NSC110CBF manual when the battery is not in use and the ACA manual when it is left in place. After storage, they say, the bike should be inspected against the maintenance schedule. Whether a rental bike was put away like that is something only the shop can say; the start-up checks below apply either way.

Start-up checks from the pre-ride list

Both manuals call the pre-ride inspection the rider’s responsibility and say it is required for safety, because even a small fault such as a soft tyre can cause serious trouble. Their lists cover the same ground, with one addition on the liquid-cooled ACA models:

For a longer checklist written for this city, see Hanoi Motorbike Pre-Ride Safety Checklist.

Tyres after a fortnight

The NSC110CBF manual asks for a tyre check by eye and with a pressure gauge at least once a month, or whenever a tyre looks low, with the tyres cold. It also asks riders to look for cuts or cracks deep enough to expose the inner layers, sharp objects stuck in the tread or sidewall, bulges on the sidewalls and uneven wear. If the tread wear indicator is visible, the tyre should be replaced at once. The cold pressures in the two manuals are:

• NSC110CBF: front 200 kPa, rear 225 kPa, with or without a passenger.
• ACA models: front 200 kPa; rear 225 kPa for the rider alone. With a passenger, the rear is 225 kPa on the ACA160CAF and 280 kPa on the ACA125CBF and ACA125CAF.

Carrying a second person changes those figures on some versions; Two People on One Hanoi Rental Bike: Load Limits and Pre-Ride Decisions covers that choice.

Battery checks when the start is slow

Both manuals describe a maintenance-free battery that needs no fluid checks, though the terminals should be cleaned if they are dirty or corroded. If the starter motor does not turn, the NSC110CBF manual lists four checks: the starting procedure, a blown fuse, loose battery connections or corroded terminals, and the battery’s condition. If the fault remains, the bike goes to an authorised Honda store. For a flat battery, the manual says to remove it and charge it with a motorcycle charger, not a car charger, which can overheat and damage it. It also advises against jump-starting from a car battery, which may damage the bike’s electrical system. Both manuals warn that a battery gives off hydrogen gas that can explode, and recommend leaving battery maintenance to a skilled mechanic. A battery that does not recover after charging is a matter for the store.

The ACA models give extra clues: a battery charge indicator that, if lit while riding, may mean low voltage or reduced battery performance, and a meter that displays the current battery voltage. On bikes with an idling stop system, both manuals say a weak battery is a reason to switch the system to IDLING and have the battery checked.

Starting the engine without harming it

The NSC110CBF manual sets out a routine for a hot or cold engine: bike on the centre stand, rear brake lock on, ignition on, and a check that the PGM-FI malfunction indicator (MIL) has gone out. Then, with the throttle closed, press the starter and release it as soon as the engine runs. Its notes add:

• if the engine does not start within 5 seconds, turn the ignition off and wait 10 seconds before the next try, so the battery voltage can recover;
• if it is hard to start, open the throttle slightly, about 3 mm not counting free play, while starting;
• if it still will not start, hold the throttle fully open and press the starter for about 5 seconds, then repeat the normal procedure; if it does not fire, wait 10 seconds and try again;
• the engine will not start with the throttle fully open.

The same manual warns that idling too long or revving continuously can damage the engine and exhaust, and that running the engine in place for a long time can harm it because cooling and lubrication are inadequate. It also warns that exhaust contains carbon monoxide, and says to run the engine only outdoors where ventilation is good, not in a garage or enclosed space.

When the manuals send the bike to a workshop

The manuals point owners to an authorised Honda store in several situations relevant to a start-up check: the MIL lighting while riding, which they say may mean a serious fuel-injection problem; any indicator lamp that does not work as it should; a starter fault that remains after the basic checks; and a battery that will not recover after charging. A tyre showing its wear indicator needs replacing. For a renter, these are the points to raise with the shop before riding on. A full inspection routine is in Scooter Rental Hanoi: How to Check the Bike First – Complete Pre-Rental Inspection Guide.

What the pages leave out

Neither manual names two weeks, or any period, after which a bike counts as stored, and neither says how old petrol must be before it counts as “old”, though both manuals say not to use old or dirty petrol. Neither is written for renters: they do not say whether a renter may charge or disconnect a battery, adjust tyre pressures or open covers, or what a shop provides. Bikes are identified by model code only. Every check here comes from Honda Vietnam’s manuals; no independent safety organisation’s checklist is included.

Sources checked

• Honda Vietnam: NSC110CBF owner’s manual
• Honda Vietnam: ACA160CAF and ACA125CAF/CBF owner’s manual

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