Why are so many threads on my wr450 04 made from chocolate! Both "middle" bolts on the yamaha sump guard are stripped, its now held on by the top and underneath one only. Then this evening, i notice that the rubber I put under the chain guid to prevent the swinger wearing (cheers yamaha) had perished so I renewed it, only tis timeI doubled it up. Then as I did the most rear poxy allen bolt up, (what sort of crap small thread is that), the bastard stripped as well! Must have been to much rubber meaning it would not snug up without striping its threads. So two things, why the hell do Yamaha insist on this stupic crappy chain guide design, and second, will I be able to drill and tap the swinger to take a more meaty thread? If so what size is the current thread, (its a 3 mil allen head bolt) and what should I go up to. Seriously kissed off by it, was due to go on a big ride Friday and may not be able to get it fixed in time now!