Those are about the bare minimum that you can go but it will help a bunch. You can also play with the gearing and different tires will help as well.
From what I can tell, Pappy knows a thing or two about the little thumpers so he is a good one to talk too.
Eric at ICRacing is building my son's at this time we are doing a little more than the bare minimum though .
My Toy's
2008 H-D FLHX
2008 Honda 500 Rubicon
Wifey's Toy
2007 Suzuki LTZ90
Kyle's Toys
2006 Honda TRX 300EX
2004 Honda TRX 90
Sponsors:
Owen Motorsports, Scott Cain Racing,Blaster Boy Motorsports,Elka Suspension Systems, JRC Performance,Finchers Racing (Profab), Uncle Jeremy, Mom and Dad.
If you let off for a second, that's where you'll finish.