I've been doing a lot of searches here, getting accustomed to some of the details of the DRZ motors. I've owned my DRZ400K for almost 3 years now, but quite honestly, I haven't done a dang thing to it beyond changing the oil, and had no desire to do anything more to it, since I use it for tight technical woods riding, it was more than enough for my purpose. Now that I'm getting more serious about increasing power (with the SM) I figured it was time to get edumicated One thing I've noticed in many threads, is the dreaded words "scotch brite". I wanted to give a heads up to anyone that doesn't know, do NOT use scotch brite on internal engine components, or anything that will see engine oil. ANYTHING with aluminum oxide (which is the abrasive used in scotch brite, among many other abrasive products) is one of the quickest ways to destroy a motor. Aluminum oxide is very nasty stuff. The particles can be/are very very tiny. So tiny, the oil filter won't stop them, ie roughly 3 microns. But they are extremely abrasive, and with enough quantity, can destroy a brand new engine in amazingly few miles. I myself destroyed a motor once, using "whizzy wheel's", motor had a rod knock within 50 miles. Most of the different manufacturers have put out TSB's saying warranty is void for engine failures that they find traces of aluminum oxide. Very nasty stuff. Hopefully, this helps someone.