Need to replace key cylinder - 1994 Honda CBR 900 RR Fireblade

The key has to be in the switch, battery unhooked, turn key to start position, insert probe into small hole above cylinder to trip the wedge, and pull out.

Hello: It sounds like the tumblers came loose in the ignition lock cylinder. You will need to replace the lock cylinder and possibly the key to. A worn key is hard on the lock cylinder.

Your key could be worn too much or the cylinder could be seized. Spray the cylinder with pb blaster or wd40 with the key inserted in the cylinder. Tap lightly on the key in different directions but not hard enough to break the key.
If that does not help, the key could need to be replaced or the cylinder needs to be looked at by a lock smith or replaced.
Good luck

Ignition lock cylinders are pretty notorious for this. You may get the thing to turn by wiggling the key up and down while turning at the same time. I have also had luck in tapping on the cylinder with a screwdriver handle while turning the key. To completely fix the problem, you will have to replace the lock cylinder. GM (AC Delco) lock cylinder kits come with an assortment of tumblers so the new cylinder can be set-up to work with your existing keys.

Fixed one the other day. The key was wearing down. Had dealer cut another key off vin number. Fixed problem. Lubricate the key hole also as dirt and grime can cause problems to.

Remove the shroud cover, and the plastic ring around the lock cylinder.WD-40 the lock cylinder, Put the key in the ignition. Rap(Hard) on the back of the key while try to turn key. If it turns leave it in the ON(not run)and I'll tell you how to remove the cylinder.(If You need). The cylinder NEEDS to be replaced.

disconnect the battery and pull the air bag fuse out to diable the air bag. Remove the steering coulmb trim covers and expose the lock cylinder. If the lock cylinder can be turned and is functional then push in the bottom tab and turn the lock cylinder then pull the whole cylinder out. If the keys broke inside and the lock cylinder is not functional the bottom tab will need to be drilled out.

the tumblers in the ignition cylinder is jambed.
replace the lock cylinder to fix this problem

If your key is worn try getting a new one cut.
The ignition lock cylinder and keys do not contain any coded electronic components. The lock cylinder housing contains the coded electronic components. Changing an ignition lock cylinder or replacing a key is a purely mechanical process which does not affect the vehicle theft deterrent system. To replace an existing key, simply cut a new key to match the existing one. If no keys are available, the lock cylinder must be changed. To change the lock cylinder, simply replace the existing lock cylinder with one of the same type.
If you are unable to operate the ignition cylinder with a new key then you will probably need to replace the cylinder and switch.Replacement of the switch involves reprogramming
The system may be programmed with or without a scan tool.
There is a way to get the cylinder out without replacing the switch but this procedure should be performed by a qualified GM technician as it involves removal of the switch and some precise drilling.

disconnect the neg battery cable. remove the plastics around the steering column, this may entail removal of neighboring plastic components. there should be a small hole or pin on the bottom (or top) side of the key cylinder housing, with key in acc position use a small punch/screwdriver, nail etc to release the key cylinder lock, remove cylinder. reverse the steps for replacement.