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jkv45 · September 17th, 2014, 07:32 AM

To check the battery you need to do 2 things - check the standing voltage before you crank (100% charged is 12.7V), and check the voltage under load. You can get a good reading when not under load, but the instant there is a load the voltage can temporarily drop to an unusable level (under 11V).

Check the voltage while cranking to confirm the battery is good.

I had a similar issue with SV650 project bike I recently picked up. It would barely crank, even with a bigger fully-charged battery. Turns out the starter relay was bad, but still working. It was getting hot and creating a bunch of resistance.

You can apply power directly to the starter with an auxiliary battery (bypassing the relay) to determine if that is the issue.

September 17th, 2014, 07:32 AM	#6
jkv45 Rev Limiter Name: Jay Location: WI Join Date: Jul 2013 Motorcycle(s): '06 SV650n, '00 Derbi GPR, '64 CA77 Dream 305, '70 CL450 Scrambler, numerous dirt bikes Posts: A lot. MOTM - Jun '18, Oct '16	To check the battery you need to do 2 things - check the standing voltage before you crank (100% charged is 12.7V), and check the voltage under load. You can get a good reading when not under load, but the instant there is a load the voltage can temporarily drop to an unusable level (under 11V). Check the voltage while cranking to confirm the battery is good. I had a similar issue with SV650 project bike I recently picked up. It would barely crank, even with a bigger fully-charged battery. Turns out the starter relay was bad, but still working. It was getting hot and creating a bunch of resistance. You can apply power directly to the starter with an auxiliary battery (bypassing the relay) to determine if that is the issue.