19/04/2026
Starting A Motorcycle After It Has Been Sitting For A Long Time
requires a methodical approach to avoid damaging the engine or fuel system.
The fuel degrades after roughly 6 months and the battery is likely dead.
1, Initial Assessment.
*Check the Residents.
Mouse nest in air box ,under seat or in the exhaust.
They may chew wiring.
*Inspect Tyres.
Check for cracks(dry rot) and flat spots.
*Look for leaks under the bike.
Check oil level and colour (If it looks milky , moisture has entered).
2,Fuel & Battery.(The two big hurdles)
Drain the tank entirely and refill with fresh fuel. The old one can turn in to varnish and clog the jets.
The battery likely dead or damaged.Try charging it with a smart charger /tender But be prepared to replace it if it doesn't hold a charge.
3,Pre-Start Engine Maintenance.
It is best to change the oil to remove any contensation that built up over the year
Remove the spark plugs and pour a small teaspoon of motor oil or marvel mystery oil in to each spark plug hole.This prevents damage on the first start from dry cylinder walls.
*Turn the engine by hand.
While the plugs are out ,turn the rear wheel while in a high gear ,or use a socket on the crank shaft to make sure the engine is not seized.
4, Starting the Bike.
Prime the fuel system.
If you have the fuel injection, turn the key on and off 3-4 times to let the pump fill the lines.If the carburetors turn the pet cock on and wait a minute.
*Use the kick start if available.
Kick it a few times with the ignition off to circulate oil.Then turn the key on and try to start it.
Do not rev immediately.
Once it starts ,let it idle gently.Do not rev it hard immediately as the oil needs time to reach the top end of the engine.
5,Final Safety Check.
Brakes.
Ensure the levers do not feel 'spongy' .Old break fluids can absorb water .Test them at low speeds before riding.
Chain.
Clean and lubricate the chain as it likely dried out.
Test Ride.
Take a very slow ,short trip around the block to listen for noises,Feel for smooth operation and ensure the Tyres are gripping.
If the bike is carbureted and has been sitting for over a year,it is highly likely the carburetor will need to be cleaned or rebuilt due to gummed - up jets.