My son weighs 87# in full gear and rides a stock kx65. The suspension is really clanging when he lands off jumps. Can you recommend spring rate / other mods to set it up properly. Stock fk sprgs are .27, shock is 3.9 - For a 75-85# rider Team green recommends .28 fork which is heaviest OEM avail and 3.9 Shock sprg. They also make a 4.1 and 4.3 spring. Any idea of the cost to replace springs and do the mods? Thanks
