charging

Just got this atv 1 month ago the guy said everything was fine with it no problems i used it just to make sure everything was going good. I bought it and brought it home next day turned it on with no problem but i noticed it struggled turning on for some reason it seems like battery is not...

06 ltr450:rock: with air box lid removed, baffle out, and cherrybomb. I had a problem with my quad charging in the past and it was the voltage regulator, when i put the new regulator in everything was fine and charging about 14.2 volts at idle and went up with rpm increase it never hit more...