I tried to install zerks on the rear suspension pivots on an RM 125 once. It's a bad idea! The pivot pins and bushings are hardened and you cannot drill them to get proper grease distribution. Installing the zerk itself is no big deal, but you have to have grease holes through the bushings to actually reach the bearings. My old RMX 250 was set up quite nicely with zerks from the factory, which I thought was a good deal. The KTM's I've had are just sealed very, very well. The swingarm, steering head and shock end bearings stay clean and dry, so they last forever. Proper seal design is the best alternative to zerks.