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Help Help required please FZR250

Discussion in 'Yamaha 250cc In-Line 4's' started by Tigger996, Jun 25, 2018.

  1. TonyZXR

    TonyZXR Well-Known Member

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    is the battery being charged when the engine is running ?
     
  2. Tigger996

    Tigger996 Well-Known Member

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    Don't know. The problems listed above do get progressively worse during a weekends sprinting.
     
  3. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    So with the voltage around 12v it should have a minimum of 12.6v after sitting for an hour. Idling it should be putting out about 13.8v, then at 4000rpm + it should be around 14.4v
     
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  4. Tigger996

    Tigger996 Well-Known Member

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    I will check it as soon as the temp in my bike shed drops to a sensible level. We are in a heat wave in the UK and a flat roofed shed acts as an oven.
     
  5. Tigger996

    Tigger996 Well-Known Member

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    Voltage remains constant at about 12.7V with or without the engine running. Do they suffer with regulator/rectifier problems (hopefully yes as it is cheap to replace).
     
  6. TonyZXR

    TonyZXR Well-Known Member

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    I would first start by checking all the plugs between the stator and regulator for melting and corrosion, then check the stator is good before buying a new regulator
     
  7. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Yeah any older bike can have problem's with the regulator/rectifier.
    If your reading's off the stator are good, and no problem's between the plug/socket's near the fuel pump and regulator maybe check the diode's in your reg/rect
    You can either put a new reg/rect in or find a good low km's reg/rect off another bike and modify you wiring to suit, i used an R6 rec/rect on mine.
     
  8. Tigger996

    Tigger996 Well-Known Member

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    I will check. Reg/Rec only about £12 (21.26 AUD)
     
  9. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    For a cheap china one maybe, the genuine Shindengen SH578A reg/rect would be around $150 AU
     
  10. Tigger996

    Tigger996 Well-Known Member

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    Battery charging is OK, the reason that it seemed faulty was that the regulator earth was on a panel bolt and I removed the panel to get at the regulator and didn't notice that I was testing without an earth ... D'oh. I will now move on to the coils
     
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  11. Tigger996

    Tigger996 Well-Known Member

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    Bike still has the problem 50% of the time. When it is being a pain the rightmost exhaust is cold so I will test the coil and the float chamber.

    Many people have suggested "**** in the carb" the problem is that you have to have a good sense of balance and you cannot trust the sidestand, so at my advanced age I am not going to try it.
     
  12. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    If there's still problems since the shop rebuilt it, I'd be going back and getting them to investigate.

    Before doing that I would suggest checking the slide needles for wear
     
  13. Tigger996

    Tigger996 Well-Known Member

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    I think the problem is a heat (coils?) or a intermittent blockage. Most likely the coil/lead/cap as the plug was wet when I checked it. Would any make of dual coil work as I can get new ones rather than an old genuine one?
     
  14. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    You need to match the coil resistance against the spec in the manual.
     
  15. Tigger996

    Tigger996 Well-Known Member

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    Chasing parts numbers
    Coil is the same part as fitted to Yamaha TD850
    Plug caps same as Yamaha Thundercat
     
  16. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    Last edited: Aug 7, 2018
  17. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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  18. my67xr

    my67xr Bike Enthusiast Staff Member Premium Member Contributing Member

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    ^ Those cap's are only 5K Ohm, standard FZR cap's are 10K Ohm so it would be pulling a lot more amp's through the coil's
     
  19. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    Ive had them on there for years ... Im sure I researched that before replacing them ... where did u get your info from?
     
  20. GreyImport

    GreyImport Administrator Staff Member The Chief Contributing Member

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    So I dug into the archives to find this on a very old post (couldnt find it actually on any spec sheets)

    FZR 250 specs
    Coil primary 2.8ohm +/- 15%
    Secondary 15Kohm +/- 20%
    Spark plug resistor 10Kohm
    Pickup coil 230ohm +/- 20%


    But 99% of the caps available are 5k ... why is that ?

    https://2fiftycc.com/index.php?resources/ngk-spark-plug-covers.235/

    And what will it do having the different caps on there? ... damage the coils over time ... ?
     
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