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Message: [QUOTE="lukey, post: 837850, member: 51640"] Here in Australia we have a huge problem with valve recession on the four strokes. Particuarly due to the size of the dust particles, Australia is one of the oldest continents around and from what ive read we can get down to 4 microns which is pretty fricken small. Add to this the last couple of years have been drought and you get heaps of very fine dust and some big problems. Ive been reading up on this as well and the filter Yamaha ships with the WR450 (im assuming they will all be similiar) is good down to 8 microns. Uni filter make a very good filter but is very expensive and is the dual stage design, this design is great in theory with the outer layer catching the big stuff and the inner doing the small stuff... However the big stuff is easy to stop so the damaging dust (the fine stuff that laps your valve seats for you) is already halfway through your filter. Ill leave it to you to draw your own conclusions but ive decided to go with a good thick single stage filter and the airboot dust has all but disappeared. Hope this helped a bit BTW we have not long had the crf250x released over here, they brought 3 or 4 over pre release for some guys to race in a big enduro and i think one just barely finished, they all had zero valve clearance fairly quickly. In fact there were comments made that the motors looked a lot like vacuum cleaners on the inside they had that much crud through them. Of course honda said "this has never happened before" and sent people over to check it out. They ended up blaming Aussie dust and poorly suited air filters. [/QUOTE]

Verification: Which ocean is California closest to?