'04 250x Bad Coil Resistance Question
  • smokey9lives
    Posts: 7
    Joined: Sat May 02, 2020 6:58 am

    '04 250x Bad Coil Resistance Question

    by smokey9lives » Wed Aug 12, 2020 2:49 pm

    Hi,
    I'm (still) trying to diagnose a starting problem after rebuilding the carb and installing a new head and valves.

    I got one "pop" out of it today which at least gives me some confidence I'm getting closer.

    Question: I have 2 coils, the old OEM coil and a new aftermarket coil. Both read as having more resistance than is specified in the manual.

    Primary Resistance reading is .3 ohm when it should be .07-.1 for a '04 250x.
    Secondary reading is 5.8 k ohm when it should be 4.6-4.8 k ohm

    Is a coil bad if it reads as having too much resistance?

    Thanks
    -J
  • Back2-2
    Posts: 1148
    Joined: Tue Jan 04, 2011 3:31 pm

    Re: '04 250x Bad Coil Resistance Question

    by Back2-2 » Thu Aug 13, 2020 4:50 am

    Unless there is specified a temperature that the check is done at a resistance readings can be +- 10% easily.
    Neil
    Black Hills of SD
    Life without Motorcycles would just be boring, really boring
    Honda 450X. Yamaha Tracer GT900. HD Fat Boy. Triumph Bonneville. Yamaha Majesty 400. Yamaha Grizzly. Yamaha Wolverine. Yamaha TW200
  • smokey9lives
    Posts: 7
    Joined: Sat May 02, 2020 6:58 am

    Re: '04 250x Bad Coil Resistance Question

    by smokey9lives » Sat Aug 15, 2020 7:59 pm

    Unless there is specified a temperature that the check is done at a resistance readings can be +- 10% easily.
    It was definitely hotter than the 70 degF spec for testing -more like 85 deg.

    Since they both tested pretty much the same I think it must be another issue, rather than the coil.

    Thanks for sharing your knowledge!

    best,
    J

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