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Have you try to ask your Suzuki dealer for what a CDI box and cables connection should looks like?. Try Haynes or Clymer website you should be able to find a manual describing your solution. If you belongs to a club ask around for help. Good luck
If the cylinders that wont fire are 1 & 4 or 2 & 3, then it would be an electrical/ignition problem. Check the ignition coil, wiring, connectors, CDI and pulser coil. On the other hand, if the cylinders that won't fire are 1 & 2 or 3 & 4, then it would be a carb issue. Determine if fuel is reaching and filling the bowls of the carbs by loosening the drain screws of each card. Note the amount and quality of fuel. Alternately, a carb pulldown, cleaning, soaking maybe required.
The red speed light would lit up on 80 KPH is normal. This is prescribed by Japanese law since presumably your bike is a JDM (Japan Domestic Model). If no restrictors are installed, then either remove the bulb or ignore it.
Under the left hand side cover there are 2 2-wire connections. One with a green and a black wire, one with a blue and a yellow wire.
Use an ohmmeter at R x 100 between both wires of a connector to check the pick-up coils: resistance must be between 130 and 180 Ohms.
The values of the ignition coil resistances are:
primary coil : 3-5ohms ( set ohmmeter at R x 1 )
Secundary coil : 25.000 - 45.000 ohms ( set ohmmeter at R x 1.000 )
For a correct measurement ALL leads must be disconnected ( also the spark plug leads )
The CDI cannot be tested with a simple measurement. Suzuki dealers have a special tool to test CDI boxes.
But checking the pick-up coils and ignition coils good will indicate an defective CDI.
The wires on the CDI:
Blue: PU coil 1 ( cyl 1-4 )
Yellow: PU coil 1
Green: PU coil 2 ( cyl 2-3 )
Blue : PU coil 2
Orange/white : +12v ign coil 1-4
White : switched coil negative side ign coil 1-4
Orange/white : +12v ign coil 2-3
Blue/yellow: switched coil negative side ign coil 1-4 ( and signal to tachometer )
Blue/white : ground
Thus, you must have +12V on both Orange/white leads.
I did some searching and here is a link that might help you get what you need. These are some GSXR 250 manuals. http://www.amazon.com/s/ref=nb_ss_gw?url=search-alias%3Dstripbooks&field-keywords=1989+Suzuki+GSX-R+250+Motorcycle+repair+manual&x=13&y=19
Just copy the link and you will see what I was able to find. Best of luck. If this is not what you are looking for and Robotec does not find what you need let me know because I have a friend that works for the Suzuki R&D department and I can ask him if he can get the OEM manual for you.
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