* Fuel starts to turn into a syrup from evaporation requiring you to drain the tank. (This is a big issue on 2-stroke engines, you need to do a lot more work)
* Oil should be replaced due to acidic oil eating away sediment from crank case.
* Depending on time of year coolant should be flushed (depends on what mix is already in).
* Battery will be dead.
* Brake fluid might need to be changed as well.
Half of these you can ignore but it will cause wear and isn't good thing.
* Fuel starts to turn into a syrup from evaporation requiring you to drain the tank. (This is a big issue on 2-stroke engines, you need to do a lot more work)
* Oil should be replaced due to acidic oil eating away sediment from crank case.
* Depending on time of year coolant should be flushed (depends on what mix is already in).
* Battery will be dead.
* Brake fluid might need to be changed as well.
Half of these you can ignore but it will cause wear and isn't good thing.