Problems with 7150 150 cc
 

Have a 7150 150cc gokart, starts good, runs good, no problems on flat ground but when u start up an incline with with bog down to a complete stop can push it till flatter ground off it goes again. My daughter is only 9 and she can't pull the smallest incline unless she gets a good run at it. What could be the issues.. please and thank you.

I'm located in the country not no major hills... I was told to check the driver pulley and the drivin.

Changed rollers and 2000 rmp spring to the yellow 1500 spring and 10g rollers still will not climb hill.... please help