Difficulties During Manoeuvring

Obviously, the firing order for reverse direction is different! otherwise, how will the engine start to turn in the opposite direction? If there is a dead spot and the engine doesn’t turn in either direction, the other directional start wont have the same dead spot as the cylinder to receive air in opposite direction will be a different unit??

2 stroke main engine is started by admitting starting air at high pressure  above 25 bar into the unit which has the piston position after TDC in whichever direction the Engine needs to be started.
In case of unit isolation; if that unit which is having the piston after TDC is isolated,  it leads to a dead spot wherein  admission of starting air will not be able to crank the engine.  This will be a dead spot, hindering the  start of Main engine during maneuvering.

The only possibility to start the engine will be to give a starting crank in opposite direction, in which condition the unit which is before TDC in one direction will become the unit after TDC in opposite direction. A slight movement will get other unit to Starting position. After this crank in opposite direction,  the engine can be started in the desired direction.
So, the cranking of the engine is carried out by admission of Start air in opposite direction to bring the non isolated unit to After TDC position for starting in desired direction.

2 stroke main engine is started by admitting starting air at high pressure  above 25 bar into the unit which has the piston position after TDC in whichever direction the Engine needs to be started.
In case of unit isolation; if that unit which is having the piston after TDC is isolated,  it leads to a dead spot wherein  admission of starting air will not be able to crank the engine.  This will be a dead spot, hindering the  start of Main engine during maneuvering.

The only possibility to start the engine will be to give a starting crank in opposite direction, in which condition the unit which is before TDC in one direction will become the unit after TDC in opposite direction. A slight movement will get other unit to Starting position. After this crank in opposite direction,  the engine can be started in the desired direction.
So, the cranking of the engine is carried out by admission of Start air in opposite direction to bring the non isolated unit to After TDC position for starting in desired direction.