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FJ1100 won't run in neutral with sidestand down

Started by Gearbox Paul, Yesterday at 10:14:54 PM

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Gearbox Paul

Yesterday at 10:14:54 PM
I'm having trouble figuring this out.  1985 FJ1100.  Bike starts and runs fine in neutral with the kickstand up.  When I lower the kickstand (with bike still in neutral), the starter cranks over but the bike won't start.  When running in neutral, if I lower the kickstand, the bike dies.  If I pull the clutch in, bike will run in neutral or in gear with the kickstand down (or up).  And when the bike is in neutral, the neutral light on the dash always lights up. 

so far I tested the kickstand safety switch and I get no continuity when it is down and low resistance (about 40 ohms) when it is up.  It's supposed to have full continuity (0 ohms) when up, so I don't know if 40 ohms is close enough to full continuity, or not. 

I also tested the side stand relay and the results don't make any sense to me.  The resistance across the powered leads reads 75 ohms which is within spec.  When I apply power to these leads, I can hear the relay clicking.  With power applied, I have no continuity (infinite resistance) across the other two leads, and without power, I have full continuity (no resistance).  this is the opposite of what should happen, according to the service manual. 

I haven't tested the neutral light switch yet.  But the green neutral light is working.  It is possible to have the neutral light working but the switch failed ??

I'm a little lost.  Hopefully my description above isn't too confusing. 
1985 FJ 1100
1996 GSXR 750

Billy Bananahead

#1
Today at 06:50:34 AM
I thought that what you are describing is right. Is what you're doing all with the bike on the centre stand?
It's a safety switch to stop you riding off with the side stand down. Unless i'm reading it wrong.

Millietant

#2
Today at 07:43:46 AM
Mine starts and runs in neutral with the side stand down (with and without the clutch pulled in).

If pull in the clutch and put the bike into gear with the engine running and the stand down, the bike cuts out, so I can't ride off with the side stand down. That's the way it's supposed to work  :good2:
Dean

'89 FJ 1200 3CV - owned from new.
'89 FJ 1200 3CV - no engine, tank, seat....parts bike for the future.
'88 FJ 1200 3CV - complete runner 2024 resto project
'88 FJ 1200 3CV - became a race bike, no longer with us.
'86 FJ 1200 1TX - sold to my boss to finance the '89 3CV I still own.

Gearbox Paul

#3
Today at 01:01:19 PM
Quote from: Billy Bananahead on Today at 06:50:34 AMI thought that what you are describing is right. Is what you're doing all with the bike on the centre stand?
It's a safety switch to stop you riding off with the side stand down. Unless i'm reading it wrong.

You're reading it wrong.  The bike will not run (no ignition) in neutral with side stand down.  That's my problem.
1985 FJ 1100
1996 GSXR 750

Gearbox Paul

#4
Today at 01:04:23 PM
Quote from: Millietant on Today at 07:43:46 AMMine starts and runs in neutral with the side stand down (with and without the clutch pulled in).

If pull in the clutch and put the bike into gear with the engine running and the stand down, the bike cuts out, so I can't ride off with the side stand down. That's the way it's supposed to work  :good2:
Quote from: Millietant on Today at 07:43:46 AMMine starts and runs in neutral with the side stand down (with and without the clutch pulled in).

If pull in the clutch and put the bike into gear with the engine running and the stand down, the bike cuts out, so I can't ride off with the side stand down. That's the way it's supposed to work  :good2:

Yes, I'm aware of how it is supposed to work.  Mine won't run in neutral with the side stand down.  That's what I am trying to troubleshoot.
1985 FJ 1100
1996 GSXR 750

T Legg

#5
Today at 01:45:37 PM
 It could be a bad diode in the diode block #27 on the factory manual schematic.The kickstand relay contacts when closed ground out the ignition control and prevents the spark plugs from firing. When the kickstand is up it closes the switch and gives the kickstand relay coil a path to ground energizing the coil and causing the relay contacts to open up ungrounding the ignition module and allows spark. There is a second path to ground for the kickstand relay coil that goes through a diode to the nuetral switch to ground. If that diode goes out then the only way to ground for the kickstand relay is through the kickstand switch.
T Legg

T Legg

#6
Today at 01:48:05 PM
The schematic .
T Legg

Bones

#7
Today at 02:32:47 PM
Do you have the standard clutch master cylinder fitted, I fitted an FJR1300 clutch master to mine that had three prongs on the clutch switch instead of the FJ's two and no matter which way the wires were fitted on the prongs everything seemed to work backwards to normal, like bike would start in gear with clutch out etc.

I had to pull the switch apart and delete one prong and bend and move another one around so the plug would fit on and now everything works like it should, had me stumped for a while though.
93 fj1200
79 suzuki gt250x7


Too young to be old but old enough to know better.
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