02 KDX MX racing upgrade

If you want to run serious MX even at your weight you will need heavier shock and fork springs and probably you will need to revalve your forks. Standard power enhancing stuff like removing the airbox top, FMF Rev Pipe and rejetting will help with power. I run almost entirely MX and I went to a 14 tooth front sprocket and a 50 tooth rear sprocket, thats kind of like dropping 1-2 teeth on the back with the stock 13 on front, my dealer didn't have 47 and 48 tooth rear sprockets in stock so I improvised. The reason I went this way was that 3rd gear didn't carry quite far enough for many MX jumps and 4th gear was too much.