Hello everyone,
I've got a 1984 FJ 1100.
The problem is that it only runs on 2 cylinders most of the time, sometimes it runs on 4 cylinders for a minute but then it goes back to 2.
I thought is was the coil and replaced it. That makes no different at all.
I put an Ohmmeter over the wires and they were all good.
now question is : Could it be the ignition box or the switch by the crankshaft?
I don't know that much about motorcycles but I hope someone has had the same problem and knows what wrong.
Those are both possibilities mate.....and another is spark plugs...have they been replaced?
Because its a lost spark system, if one plug goes bad, its mate may not fire either.
Harvy
Have you tried swapping the coils and leads over 1&4 into 2&3 and swap the orange to gray plug over as well, , do u know what 2 cylinders dont fire ?
First off: Which two cylinders? If it's the left pair or right pair, it's not an ignition problem (probably), but more likely a fueling problem. If it's the inside pair or outside pair, then spark sounds quite likely.
Second off: New plugs in it, ya? A bad plug that shorts (low resistance path to ground) will prevent the related cylinder from firing (i.e., a bad plug on #2 would take #3 with it, v/v for 1 and 4).
Next off: Check for an intermittent short or open circuit on the low voltage side of the coils. You'll have to trace the wiring out and look for frayed or broken bits between there and the ignition unit. Kinda a hassle, that.
To check for a bad coil, swap the two that are on there (both the low voltage side and the sparkplug side) and see if that moves the dead cylinders. If it does, then yeah, you're almost certainly got it sussed.
Thanks for the reactions
I have swapped the 2 coils and then I get a spark on cylinder 1 and 4, and otherwise it sparks on 2 and 3,
i have tried an other coil and that doesn't help.
i have tried an other ignition box an that doesn't help either.
i have also checked the resistance of the pickups and that is good to.
Now I will check the wiring from the coils to see if there is a short to the ground
I have put a new piece of wire between the coil and the ignition box and that makes no difference.
Now I really have no idea what to check for.
Quote from: gijs on July 24, 2011, 10:15:26 AM
Thanks for the reactions
I have swapped the 2 coils and then I get a spark on cylinder 1 and 4, and otherwise it sparks on 2 and 3,
i have tried an other coil and that doesn't help.
i have tried an other ignition box an that doesn't help either.
i have also checked the resistance of the pickups and that is good to.
Now I will check the wiring from the coils to see if there is a short to the ground
I have swapped the 2 coils and then I get a spark on cylinder 1 and 4, and otherwise it sparks on 2 and 3
i have tried an other coil and that doesn't help.
Has to be coil or conection/wiring.One of them is not firing.
Moving coil to other cylinders shows you the good coil.You might have a bad other coil.(the one you swapped)
You can test the coils it sounds like you have a bad coil or coil conection.
Quote from: Flying Scotsman on July 24, 2011, 10:59:56 AM
Quote from: gijs on July 24, 2011, 10:15:26 AM
Thanks for the reactions
I have swapped the 2 coils and then I get a spark on cylinder 1 and 4, and otherwise it sparks on 2 and 3,
i have tried an other coil and that doesn't help.
i have tried an other ignition box an that doesn't help either.
i have also checked the resistance of the pickups and that is good to.
Now I will check the wiring from the coils to see if there is a short to the ground
I have swapped the 2 coils and then I get a spark on cylinder 1 and 4, and otherwise it sparks on 2 and 3
i have tried an other coil and that doesn't help.
Has to be coil or conection/wiring.One of them is not firing.
Moving coil to other cylinders shows you the good coil.You might have a bad other coil.(the one you swapped)
You can test the coils it sounds like you have a bad coil or coil conection.
If I put the wire from the right coil on the left coil then the other coil works. so it can not be a bad coil.
and the orange wire that comes out of the ignitionbox, I have cut that and put a new wire to the coil and that doesn't work. ( I don't know if it should work this way)
I'm making the assumption that this problem just began and that it didn't occurr after another repair.
I would check the wiring from the pickups to the ignition module; open wire, pinched wire at the oil filter housing, alternator or pickup cover. I have to tell you, when I was installing my engine I removed the wiring connectors from the plug that go to the igniton module to route them thru a tight spot, when I reinstalled them I had two of the three wires backwards and I had the same symptoms that you have.
can anyone tell me if the plug from the ignition with 4 pins if it has to have 3 or 4 wires in it
Should have 3 wires . black orange and gray , would be for the coil pick ups ,
does anyone have a wiring diagram so that I could rewire the intire wiring from the pickups to the coils.
just to make sure that's not the problem.
Quote from: gijs on July 24, 2011, 03:56:29 PM
does anyone have a wiring diagram.....
I can show where to get one.
On the back page of all the FJ owner's manuals, is the wiring diagram for that specific model....Don't have a owners manual?
Down load one free from Yamaha: http://www.fjowners.com/index.php?topic=3483.0 (http://www.fjowners.com/index.php?topic=3483.0)
Quote from: gijs on July 24, 2011, 03:56:29 PM
I have swapped the 2 coils and then I get a spark on cylinder 1 and 4, and otherwise it sparks on 2 and 3,
i have tried an other coil and that doesn't help.
If it sparks on 1&4 and you swapped coils and now it sparks on 2&3, then you have a bad coil. Something must be wrong with your replacement coil.
Why do you think that it is the wiring when the circuit for coils 1&4 and then the circuit for coils 2&3 work correctly when the right coil is used?
Cheers! Pat
Quote from: Pat Conlon on July 24, 2011, 05:07:19 PM
Quote from: gijs on July 24, 2011, 03:56:29 PM
does anyone have a wiring diagram.....
I can show where to get one.
On the back page of all the FJ owner's manuals, is the wiring diagram for that specific model....Don't have a owners manual?
Down load one free from Yamaha: http://www.fjowners.com/index.php?topic=3483.0 (http://www.fjowners.com/index.php?topic=3483.0)
Quote from: gijs on July 24, 2011, 03:56:29 PM
I have swapped the 2 coils and then I get a spark on cylinder 1 and 4, and otherwise it sparks on 2 and 3,
i have tried an other coil and that doesn't help.
If it sparks on 1&4 and you swapped coils and now it sparks on 2&3, then you have a bad coil. Something must be wrong with your replacement coil.
Why do you think that it is the wiring when the circuit for coils 1&4 and then the circuit for coils 2&3 work correctly when the right coil is used?
Cheers! Pat
I mend that i swapped the connectors
Well, that means that the dead coil is still there.
Spec them both out, but it sure sounds like one of them is bad internally. As the stickers say, no user serviceable parts inside, but this time they mean it.
I don't know how exactly to explain it but i am certain that its not the coil because i already swapped it and the connectors, everything over there points to the fact that the coils are OK
I thought I had it fixed, I put an extra wire to the battery ground from the coil.
but now it runs on 2 again.
when its idling it runs on 4 cylinders but if it comes above 1000rpm it runs on 2.
I measured the voltage on the ignition box, the wire to the coil and the + from the battery, for the coil cylinder 1 - 4 the voltage goes to 0 if its not idling. cylinder 2 -3 coil the voltage stays about 3,5 volts.
could this be a faulty pickup?
The neutral light used to burn on contact and wile running, now it only goes on during starting
When mine was shooting flames from the pipe , was a small fray in a coil wire at the front of thd tank, but then i found the fuse connector plug had pulled apart just enough to make the bike run bad but still start ok. the plug is just under the fairing below the bottom edge of the gauges, i only found it because the cut off relay would click when moved,
Quote from: gijs on July 25, 2011, 01:42:11 PM
could this be a faulty pickup?
Was you able to do an ohm reading on them?
the ohm reading is 168 and 169
the bike ran on 4 cylinders today but if i went above 4000rpm it would go bak to 2.
i found two wires with a green plug and they were stripped down and the copper was touching. if i pull the wires apart from each other then the bike wont start.
and if put hem together the neurtral light and de oil level light go on.
I remember that green plug but, I can't remember what it goes to. From your description it sounds like the side stand switch. Was your side stand up when you tried to start it?
Quote from: gijs on July 26, 2011, 04:31:34 PM
i found two wires with a green plug and they were stripped down and the copper was touching.
sounds like your getting closer.
Quote from: SkyFive on July 26, 2011, 05:37:45 PM
I remember that green plug but, I can't remember what it goes to. From your description it sounds like the side stand switch. Was your side stand up when you tried to start it?
my bike does not have a side stand switch and I do not know were the wires from the green plug are for
the wires are from the neutral switch and the oil level switch.
and if if i touch them together then the bike starts and otherwise it wont even crank the engine
Wouldnt be a sidestand switch, the 1100,s dont have one
(http://www.unrealspawnboard.com/Smileys/UNREAL/sign_BS.gif)
Well not here anyway :i_am_so_happy:
Quote from: Travis398 on July 27, 2011, 04:44:38 AM
(http://www.unrealspawnboard.com/Smileys/UNREAL/sign_BS.gif)
Well I think I fixed it.
I found that the neutral switch had no bolts in it, so I went to the store and got a couple of bolts and screwed them in.
now the bike runs on 4 cylinders.
I went for a test drive and it still runs good after 5 kilometers.
and my bike does not have a side stand switch, its A FJ 1100 from 1984
Excellent mate,glad you found the problem,an :scratch_one-s_head:d it was an easy fix,, was about as much fun to find as my 84,s gremlin :dash1 :dash1:
new there was no stand switch :biggrin:
just did an other 20km test ride and the problem is not 100% gone. sometimes it starts running on 2 cylinders for a minute and then it goes back to 4,
could it stil be the neatral switch or do I need to search somewere else
Quote from: gijs on July 27, 2011, 08:17:07 AM
just did an other 20km test ride and the problem is not 100% gone. sometimes it starts running on 2 cylinders for a minute and then it goes back to 4,
could it stil be the neatral switch or do I need to search somewere else
check the fuse connector from the fuses in the fairing where they plug into the main wiring loom .that's why mine was playing up and loosing spark ect
checked the fuse and sprayed it with contact cleaner
but that does not help.
the bike start running on 2 cylinders more then on 4 cylinders now
If all the electrics are checking out fine, then to me it sounds like it's pointing to a problem with the carbs, and the main jets being blocked.
Have you had the carbs apart for cleaning or inspection?
Ive got the craburator boils of and sprayed the jets with carb cleaner
Quote from: gijs on July 29, 2011, 06:35:31 AM
Ive got the craburator boils of and sprayed the jets with carb cleaner
Not The Craw, The CRAW!
(http://img204.imageshack.us/img204/9228/thecraw.jpg)
Quote from: Klavdy on July 29, 2011, 07:40:58 AM
Quote from: gijs on July 29, 2011, 06:35:31 AM
Ive got the craburator boils of and sprayed the jets with carb cleaner
Not The Craw, The CRAW!
LOL.
To be honest with you gijs, i think that you might need to take the crabs boils off and clean them out 2 or 3 times for best results.
Take all the jets out and thoroughly clean them and all the orifices.
next weekend I am going to take the bike apart to check out every thing.
I will let you know if I find something
Quote from: Pat Conlon on July 24, 2011, 05:07:19 PM
Quote from: gijs on July 24, 2011, 03:56:29 PM
does anyone have a wiring diagram.....
I can show where to get one.
On the back page of all the FJ owner's manuals, is the wiring diagram for that specific model....Don't have a owners manual?
Down load one free from Yamaha: http://www.fjowners.com/index.php?topic=3483.0 (http://www.fjowners.com/index.php?topic=3483.0)
Quote from: gijs on July 24, 2011, 03:56:29 PM
I have swapped the 2 coils and then I get a spark on cylinder 1 and 4, and otherwise it sparks on 2 and 3,
i have tried an other coil and that doesn't help.
If it sparks on 1&4 and you swapped coils and now it sparks on 2&3, then you have a bad coil. Something must be wrong with your replacement coil.
Why do you think that it is the wiring when the circuit for coils 1&4 and then the circuit for coils 2&3 work correctly when the right coil is used?
Cheers! Pat
i would agree with pat on this . another question i have is have you changed the oil filter latley if so maybe the wires from the stator got pinched in the housing????
Brian
What was the ohm reading on 1&4 nd 2&3 plug caps?
I got the engine out and I am think I Will solder all the wires to the connectors so that Will be 100%
I will keep you guys up to date if make any progress
If I can help, let me know. I'm actually able to pop by for a look.
Old wiring is a B...