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Project FZR fix up

Discussion in 'Your 250cc Projects' started by Yetiburger, Oct 7, 2017.

  1. Yetiburger

    Yetiburger Active Member Premium Member Contributing Member

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    its brand new second hand. multi reads 3.6 and 14.33
     
  2. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Put your multimeter to 200 Ohm's and touch the red lead and black lead together, what's the reading there ?
    That should come off the 3.6 Ohm reading

    Have you tried swapping the coil's around, eg if the new coil wasn't working on 1 & 4 swap the wire's that connect the coil's from the main harness / TCI with coil 2 & 3 and see if it's doing the same thing
     
  3. Yetiburger

    Yetiburger Active Member Premium Member Contributing Member

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    ok so the multimeter resistant is 1 ohm. i had both coils hooked up correctly and the thing kinda wanted to fire every now and then. no different if coil 1/4 is unplugged. then i swapped plugs from the TCI and it had a couple of little back fires. What does this mean? the coil is good but the TCI is bad?
     
  4. Yetiburger

    Yetiburger Active Member Premium Member Contributing Member

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    ok so checked again and i think it is the coil.
     
  5. Yetiburger

    Yetiburger Active Member Premium Member Contributing Member

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    ok so its been a busy couple of weeks. managed to get all my fairings done and fixed up. 20180706_094307.jpg 20180706_113842.jpg 20180706_100816.jpg 20180711_135919.jpg
     
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  6. Yetiburger

    Yetiburger Active Member Premium Member Contributing Member

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    but I still need another coil to get it all running. Does anybody have a good one they're willing to sell? I've also had the bolts strip out in one of the front callipers. 20180711_181605.jpg
     
  7. Yetiburger

    Yetiburger Active Member Premium Member Contributing Member

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    also my rear shock arrived. does anybody have a link to how to put it in? dog bone size etc.

    20180711_131741.jpg
     
  8. GreyImport

    GreyImport Administrator Staff Member The Big Cheese Contributing Member

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  9. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Look's like you'll need to Helicoil the caliper to fix the thread's

    @kiffsta or @Joker may have a good spare coil ?

    With the R6 rear shock conversion there's some pic's and info posted on my 3LN3 thread too,
    look at page 20, starting from post #391 and onward's
    I ended up using the standard dog bone's in mine, it dropped the rear end 10mm, otherwise the longer dogbone's made the shock too hard

    https://www.2fiftycc.com/index.php?threads/my-90-fzr250-3ln3.8776/page-20
     
  10. Yetiburger

    Yetiburger Active Member Premium Member Contributing Member

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    do you think the alli threads may have picked up?
     
  11. Yetiburger

    Yetiburger Active Member Premium Member Contributing Member

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    ok so i was taking the front discs off and it appears all the bolts that hold it on are soft and two of them rounded the head out. Can I get replacement bolts.
     
  12. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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  13. Linkin

    Linkin The Apprentice Premium Member Dirty Wheel Club Contributing Member

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  14. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    My two cents. If you use Titanium you must use anti-seize. This is what I use because it is recommended by Henkel for the application. Threadlocker is not anti-seize. Buy the OEM parts if you want to use threadlocker.
    Loctite_LB8009.jpg
     
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  15. Yetiburger

    Yetiburger Active Member Premium Member Contributing Member

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    oh rookie mistake. but they didn't put up much oh a fight to round out.
     
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  16. Yetiburger

    Yetiburger Active Member Premium Member Contributing Member

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  17. Yetiburger

    Yetiburger Active Member Premium Member Contributing Member

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    Ok guys I'm going to need your help. I have put in yet another secondhand coil that I got from a member. I didn't get it running as I ran out of battery so that's on charge. but it sounded like it was trying to fire on two cylinders again. Previously I swapped the coils over and just had the good coil for 2/3 plugged into the plug for 1/4 and I swear i got it to back fire. From this I thought the TCI must be good? Is there something missing is there something else I can check?
     
  18. Linkin

    Linkin The Apprentice Premium Member Dirty Wheel Club Contributing Member

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    This is what I would do.

    Read the voltage across each coil (the small spade terminals) with a fully charged battery and ignition on. You should see a constant 12 volts. Assuming that is OK, read again when cranking the motor. They should ground out and come back up to 12 volts again. You may or may not be able to see it depending on how good your meter is. If you get good readings then your TCI and pickup should be working fine.

    Then I would check the spark on all 4 plugs, leads, and caps, if anything looks suspect then rip it out and replace it.

    Regarding the twin coils and leads. There are only two possible combinations, since each coil fires two cylinders at a time (with one being a wasted spark at top dead centre of the exhaust stroke - hence the name). The length of the leads will give you a clue, unless they have previously been chopped or replaced.

    Fizzers are really sensitive to fuel supply to get started in my experience, especially if the pilot system is lean (partially blocked jets or too lean on the screws). If the float valves are leaking and the fuel tap is on, they will fill the intakes and your cylinders with fuel. To put this in perspective, the volume of the cylinder is compressed to roughly 6.5cc's, so there is zero chance it will fire. The fuel with be forced past the rings or valves, out the exhaust etc.

    They don't like old stale fuel either, they tend to pump it out the exhaust where it ignites thanks to the wasted spark, letting out massive afterfires.

    Speaking of which, you said you got to backfire. Is it actually backfiring out the inlet/carb, or did you mean after-firing out the exhaust?
     
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  19. Yetiburger

    Yetiburger Active Member Premium Member Contributing Member

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    i cant remember where it back fired but i think it was out the carbs. i swapped the signal to the coil but left it conneted to plugs 2 and 3. I had the bike running off the key after i rebuilt the carbs, then the last time I had it running it was only firing on 2 and 3. I believe when I check the plug to the coil it wasn't giving me 12V but I will check that again tomorrow.
     
  20. Linkin

    Linkin The Apprentice Premium Member Dirty Wheel Club Contributing Member

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    Alright, you need to sort out this issue with the coil(s) before anything else.

    If you are not getting 12v across the coil, there are only a few things that can cause it.

    A dead coil (open circuit or shorted out) - most likely
    Broken wire or high resistance in the wires from the TCI to the coil - second most likely
    Faulty TCI - unlikely unless the voltage regulator has failed and killed it - happened to me with a Zeal. I also blew a coil wide open because some idiot put a 30 amp fuse in the ignition circuit which has a 5 amp fuse as standard, and there was dodgy hack job wiring to start it without an ignition barrel.

    If you have a wrecker or are looking on ebay/gumtree etc, the Zeal uses the same coils, just with a different part number prefix (3YX instead of 3LN). You can use a Zeal TCI in a pinch as well, just to rule yours out.

    After you have the coils sorted, drain the fuel tank and carby bowls and get some fresh stuff in there. Fizzers really do not like old fuel. How long as it been since it was running on all 4?

    And did you end up doing the valve clearances?

    Keep persisting and you will get there...
     
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