Suzuki boulevard m90 Motorcycle will not start or go into nurtal?

Well it would be nice to know what you mean by WILL NOT go into neutral,

Anyway.................Lets see turn the ignition key on so you have dash lights etc, Jog the bike back and forth gently while trying to shift the gears, what you are looking for is the green neutral light to come on on the dash.If this does not work............ turn the ignition off......... jog the bike GENTLY WITH THE CLUTCH IN AND WHILE THE BIKE IS STILL MOVING A VERY small amount release the clutch.........turn the ignition back on..........................Now pull the clutch in and again attempt to shift the gears and activate the green neutral light.

If you cant shift down, shift up, if the green lite blinks you've shifted thru neutral go back the other way.

When you get a green light pull the clutch in and start the bike.

Other Problems.............. You may have an airlock in the clutch line Take it to dealer and have it bled or get a knowledgable person to help you bleed the line.

Is your battery OK.

Is your kill switch activated.