i have owned 3 bergs. 99 600 01 fc470 o2 650 the elect start has been a problem on 470 and 650. 12v is not cutting it i have spent hours on this problem i changed to a bigger starter a honda cbr-600 starter. stronger but still would not start the bike. i took a chance and hit the starter with 24v direct bike fired right up. starter was not even warm. on 12v got hot real fast. i am an electriction by trade and a mercury outboard mech. i have ran 24v to powertrim motors with no problems. i am going to try 18v to the starter and see what happens via a ballast resitor if one of these setups works long term. i will be a happy camper. having the motor start so easy on the button is better than christmas. i have started it countless times on 24v no hot starter and no problems as of yet. heck what did i have to loose. a starter! long term who knows but for now im loving it.two small 12v batt not that much xtra weight. charging both batt may take some doing but i will figure it out. i will keep the site posted on the progress of it.