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Discussion Starter · #1 ·
Hi All. My 2005 CBR1K just refuses to start. I’ve been troubleshooting a while and just read about a Zenner Diode that can fail.
Can anyone confirm that this diode is fitted to my bike year. Thanks.
 

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SuperMod
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here it its
262967



And the circuit diagram
262968


If this ends up being your problem, please come back and leave a write up so others will know what a bad diode symptoms are and how to troubleshoot and fix.

good luck
 

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Discussion Starter · #4 ·
Hi. Tested this and it passed.
apparently there is another diode in the ignition barrel that drops the voltage from 12v to 9v, do you know anything about this one?
Appreciate any help you can provide.
thanks
 

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SuperMod
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I'm not aware of another diode.

but, the general Trouble shooting steps for a bike that cranks but doesn't start are as follows.

Have you looked at the top 3 categories
  • spark
  • fuel
  • compression


------------------------------------------------------------

1. Spark Plug Inspection
Remove and inspect spark plug .
Are the spark plugs in good condition?
NO _. Incorrect spark plug heat range
• Incorrect spark plug gap
• Dirty air cleaner
YES - GO TO STEP 2.

2. Spark Test
Perform spa rk test.
Are there good sparks?
NO _. Loose or disconnected ignition system wire
• Faulty ignition coil
• Broken or shorted direct ignition coil connector wire
• Faulty ignition pulse generator
• Faulty engine stop switch
• Faulty engine control module (ECM)
YES - GO TO STEP 3.

3. Fuel Pump Inspection
Check for operation of the fuel pump and inspect the fuel flow.
Is the fuel pump unit normal?
NO - Faulty fuel pump unit (page 6-331.
YES - GO TO STEP 4.

4. Programmed Fuel Injection System Inspection
Check the fuel injection system.
Is the fuel injection system normal?
NO - Faulty fuel injection system (page 6-54, 6-43).
YES - GO TO STEP 5.

5. Cylinder compression Inspection
Test the cylinder compression.
Is the compression specified?
NO _. Valve stuck open
• Worn cylinder and piston rings
• Damaged cylinder head gasket
• Seized valves
• Improper valve timing
YES - GO TO STEP 6.

6. Engine Start Condition
Start by following normal procedure.
Did the engine start but stops?
YES Leaking intake manifold
• Leaking intake pipes
• Faulty starter valves
• Improper ignition timing (Faulty ECM or ignition pulse generator)
• Contaminated fuel
 

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When was it last ridden? How old is the fuel? I had a hell of a time with a starting problem after winter storage a couple years ago when the last tank of the season was poor quality fuel, even though I had ran it with stabilizer when I parked it. During troubleshooting I noticed that the throttle bodies had lots of tiny dark flecks splattered inside. Got all the fuel out of the tank that I could, drained the lines and with fresh stuff (and still a bit of cranking) it finally ran.
 

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Discussion Starter · #7 ·
Thanks guys for the input.
Some history. Bike fell of the stand, yep I know, broke the clutch lever and I replaced that.
After that it just stopped several times riding to work until it would not start at all.
Listening I could not hear the fuel pump prime so replaced that, fuel pump primed but would still not start. Now fuel pump does not prime again so not sure If that was the original problem or not.
I’ve checked: stand switch, relays, clutch switch, BAS, kill switch, fuses, starter relay. Fuel pump runs when connected directly to battery and has power to the plug.
I’m yet to check the ECM.
My last hope was this diode that reduces power but I’m not positive my year bike has one.
Bike ran perfectly prior to this and I’ve had it for about 5 years.
I’m at a bit of a loss where to go to now.
I’ve trawled this this site and others and all mention the things I’ve checked. So really frustrated at the moment. It must be something so simple but I just can’t find it.
 

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Discussion Starter · #9 ·
Just an update on this.
took it to a mechanic for troubleshooting and after a couple of weeks he found the issue.
found a couple of wires burnt out in the loom and some that were not burnt completely through giving and impression they were ok but not intact enough to pass a full charge to start the bike.
there was also an ECM error that he repaired and a bad earth connection.
anyway, $3k later it’s running and I look it forward to a trouble free summer of riding.
 

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SuperMod
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Just an update on this.
took it to a mechanic for troubleshooting and after a couple of weeks he found the issue.
found a couple of wires burnt out in the loom and some that were not burnt completely through giving and impression they were ok but not intact enough to pass a full charge to start the bike.
there was also an ECM error that he repaired and a bad earth connection.
anyway, $3k later it’s running and I look it forward to a trouble free summer of riding.
Thanks for the update. Electrical problems are hard to find so kudos to him.

any idea why the wires burnt?
 
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