Join Date: Jul 2003
Location: west coast of , MI,
Re: Slow Crank - Battery?
A few things come slowly into the dim cavern of my mind. Starter motors are durable, cost $$ and take time to change, so we won't go there until last.
Most starting problems are a combination of weak battery and bad connections. Loose or corroded connections at the battery or starter drop the voltage and cause the starter to slow it down, but once started there is enough 'juice' to run the bike normally.
Lift the seat and have a look at the battery terminals. Even if you don't see any corrosion, wiggle them to be sure they are snug on the battery terminals.
Before you leave on a ride, disconnect the charger and let everything sit still for 10-15 minutes, then measure battery voltage. It should be no lower than around 12.7 volts fully-charged and at rest. Anything much lower means it is not getting, or taking, a full charge, which may be either a 'bad' battery or charger.
Now, go ride!
When you return, let it sit for 10-15 minutes without connecting the charger, and measure battery voltage again, looking for the same 12.7 volts or so. Anything much less and the battery is not charging fully, and is either 'weak' or is not being charged correctly.
So, if you measure the same resting battery voltage after using your charger and after riding, a low resting voltage means the battery is 'weak.'