Training Wheel Hero
Join Date: Jul 2011
Thanked 8 Times in 6 Posts
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Did you guys ever figure anything out?
I am having problems with a 09 bought new a month ago. I replaced the battery as it probably sat in the bike and was weak to begin with when it died on me the first time.
Replaced the battery everything was fine for 3 or so weeks, then it wouldn't start again.
I tried to correlate the two instances of the battery failing, and came up with a connection:
When I tested the charging voltage with the bike running, the RPM suggested to test at is 5000 RPM. The first time the battery died I had taken my wife for a short ride to a local restaurant; a very short 6 minute ride at low RPM, probably 3000 max. The second time, I worked through lunch at work so left early to drive a few blocks away for some food before I went to my next appointment which was maybe 1.5 miles from there. Started at at the restaurant, was dead when I came out from my appointment.
My theory is that the batteries have such low capacity and resistance to stress that they give up rather easy.
For instance: You start it (draining capacity) and ride it lazily somewhere (no real charging going on) and park it, this places the batt above the engine so it warms up (stress) then when you show back up before it can cool down it tells you to go sit on a pineapple.
Both times I push started it to get home. I measured the voltage this morning before a ride and it was 12.6v, right after it was 13.2-13.0, 3 hours later right before posting I measured 13.5 volts (its a 2 week old battery).
I'm going to keep track of this for a while, but it seems to me that if you make a concerted effort to keep the RPMs up a bit, especially on short trips, this problem could be avoided. During my ride today, I kept my cruising RPM right around 5000 sometimes between 4 and 5000, rarely higher quick blasts and freeway riding aside and the battery seems to be fine.
Last edited by Nico; 09-18-2011 at 07:51 AM.