Well if the side cover only uses two notches on the key, I wondered about the helmet lock so I took mine apart and had a look - it was on the shelf anyway....
One screw to take the back off - watch out for the little detent ball that locates the lever in the unlocked position and there is a little latch tab to push in on the back end of the cylinder. The back was a little stuck in the recess and had to jar it a bit. the ball is free floating and WILL pop out before you know it.......
I didn't lose the ball or the little screw for the back ---- WheWWWWW
the helmet lock uses 5 key notches. it has 5 wafers in the cylinder that go in opposite directions when the key is removed. There is also a 4 digit number on the back of the helmet lock - it might be the code.
So unless the ignition switch needs more than 5 notches on the key that should do it. not sure why it would need more than 5 -- that is all the pins that a wieser lock has for your house....