Is it normal for my battery to drop to 8volts when trying to start the bike?

  • Buschpush
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06 Jun 2024 20:18 #900396 by Buschpush
I have a 1980 kz250 LTD and when trying to start it the battery drops to 8volts and fails to turn over the engine fast enough, is it normal for it to drop this low?

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06 Jun 2024 21:19 #900397 by 1997dr650
No not normal...battery weak... starter drawing too much .... meter inaccurate .
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06 Jun 2024 21:36 #900398 by Scirocco
Any Voltage drop value lower than 10 Volt during the e-start indicate a weak battery !
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07 Jun 2024 00:09 #900405 by Wookie58

I have a 1980 kz250 LTD and when trying to start it the battery drops to 8volts and fails to turn over the engine fast enough, is it normal for it to drop this low?
9.5-10v would be normal but 8v suggests the battery is not scrap and will potentially take a charge. On another note please try and keep to one thread to help people to help you. You have another post running ref "low compression" but that will be the case if the engine is cranking slowly due to a weak battery and doesn't indicate a problem

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07 Jun 2024 00:38 #900407 by Buschpush
Thanks man sorry about that

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07 Jun 2024 00:47 #900409 by Wookie58

Thanks man sorry about that
No worries, but as you can see potentially one issues effects another (compression/cranking speed) during a compression test you spin the motor for a few seconds to "build" pressure so obviously if it isn't spinning fast enough you will get a low reading

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07 Jun 2024 06:11 - 07 Jun 2024 06:12 #900420 by martin_csr
I have a 1980 kz250 LTD and when trying to start it the battery drops to 8volts and fails to turn over the engine fast enough, is it normal for it to drop this low?

In your other topic you said the voltage after charging was 11.9 VDC which indicates the battery isn't fully charging. The voltage drop to 8 VDC is another indication that the battery needs replacing. After charging with a good motorcycle charger, the battery should be at least 12.6 VDC. 
Last edit: 07 Jun 2024 06:12 by martin_csr.

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