My Grand Kids have a 2005 and a 2006 200cc Polaris Phoenix. The low end on the the 2005 is horrible. The 2006 takes right off. I heard upgrading the 2005 to a 2006 regulator/activator and adjusting the carburetor makes a big difference on the 2005 models. Any one got any ides? There the same engine and carburetor and gears as far as I know, so why the low end is so different is beyond me.