the first requirement is to realize why it "dies" on you. if it shuts off softly and gives just a hint in the process that it might want to surge forward however subtly....that is typically fuel related and sourced at the pump. kill-switch type death that you described is always electrical meaning the ignition system is affected adversely. the very first thing to do on your cityX is remove the seat, remove the fuse-box cover, review the cover schematic showing all fuses and your 3 relays then do this:
remove BATTERY fuse and replace. it's 10 cents! replace it. next is remove the IGNITION relay. take it to any auto parts store and purchase new. ford and chrysler a/c relays match up. it is 20 amps. match it to an identical 20 amp relay that they have in stock. dimensionally including the pin-legs it must be a precise match. then carefully check both battery terminals and cable ends. do NOT just look at them....remove the cable ends, clean everything thoroughly, replace and tighten. follow the negative cable over to the frame attachment point. do the same thing there. lastly....since you mentioned your "spedo" which i'm assuming to be your speedometer cluster....go to front of bike and locate your "4 ground wire cluster". it will be a grouping of wires either attached to the bottom triple clamp pinch bolt or the tube head-stock. find them....remove the fastener....clean...check for tight terminal ends.....replace. NOTE: a CPS unit component that is acting up sometimes, in an odd way, affect the speedometer cluster but this is extremely rare. lastly.....see diagnostics info below. DO THIS! report back with how these diagnostics work out. your problem may lie elsewhere but this is the place to start that typically resolves most of these DOA situations. others may advise adding 3 gallons of SeaFoam to your tank but i'd start here.
Easy. First thing to do is locate your diagnostic test plug under the seat. It's an empty four pin connector. If you're looking at it with the pins facing you and the locking tab at the 12:00 position, the pins are numbered as follows:
Pin 1 -- upper right corner
Pin 2 -- lower right corner
Pin 3 -- lower left corner
Pin 4 -- upper left corner
With the ignition switch off, install a jumper wire across pins 1 and 2 in the diagnostic plug.
Turn the ignition switch to the ON position and wait approximately 8 seconds for the check engine light to start flashing.
All trouble codes are sent out as a series of flashes. To retrieve the first digit of the code, simply observe the number of times the lamp flashes.
The transmission of a trouble code is always preceded by six rapid flashes (about 3 per second). This transmission is followed by a 2 second pause in which the lamp is off. The lamp will then flash one or more times to indicate the first digit of the trouble code. The length of time that the lamp will be either on or off when indicating a trouble code is about 1 second in duration.
Following the transmission of the first digit in the trouble code, there will be another two second pause before the second digit is transmitted.
After the second digit is transmitted, there will be another 2 second pause. After the pause comes another intermission (six rapid flashes) after which the next stored code is transmitted in the same manner. Once all the trouble codes have been displayed, the sequence will repeat.
If all you observe is the rapid flashing, then no trouble codes have been stored.
When done, turn the ignition key off and remove the jumper wire.
There is no way to clear trouble codes using this method. The only way to clear codes without hooking the bike up to a computer is to take the bike through 50 start and run cycles (start engine, run for at least 30 seconds, shut it off).
The trouble codes are as follows:
11 Throttle position sensor
13 Oxygen sensor
14 Engine temperature sensor
15 Intake air temperature sensor
16 Battery voltage
21 Interactive muffler control (XB12 only)
23 Front fuel injector
24 Front ignition coil
25 Rear ignition coil
32 Rear fuell injector
33 Fuell pump
35 Tachometer
36 Cooling fan
43 Speed sensor (I added this one)
44 Bank angle sensor
52, 53, 54, 55 ECM failure
56 Cam sync failure"
