I have 2007 raptor 350 I wanted to get a little more out of the bottom end so i went to my local atv part shop in my neighborhood (magic racing) and asked about maybe changing the sprockets and they told me to go down one tooth in the front to a 12 and up to teeth in the rear to a 40 and this should do the trick.Well after changing them out I think it made zero differance mabe even worse than stock.Any help would greatly appreciated.

 

i did the same thing.but i only changed out the front drive sprocket and i noticed a big difference in low end.

 

I just installed a new 12 tooth sprocket on my wifes bike and it made a world of difference. Go back to the 38 tooth rear sprocket and run it.

 

Ok, thats what I was thinking.