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Message: [QUOTE="dutbite, post: 832687, member: 56379"] [b]valve recession & dust[/b] this seems to be the forum with the more knowledgeble people so that´s why I post my questions here: I live and work in Portugal and offer guided offroad trips. Currently I own 6 KTM´s, five are 2003 EXC models. On all these EXC bikes I replaced the inlet valves and on one bike also the cilinder & piston rings after one year(my first year). The foam filters used in todays dirtbikes doesn´t seem to get rid off the finest particals. I pinpointed the cause to the fine claydust (powder) that destroyed valve and in a lesser way the seats. On all bikes the rings were also beyond specs. I´m familiar with the correct cleaning and oiling methods, I use Twinair products. I use a standard, oiled filter + dry dustcover + skin. I make sure he filterholder is in the right position. Still dust seems to pass the filter from the moment I start the engine and ride in dusty conditions. I know this because there´s a fine layer of dust covering the flame arrestor mesh wire on the [U]filter[/U] side. I spend the last few days browsing forums and widen my knowledge. I learned a lot about valve materials and combinations of materials.The emphasis is put to the tuning of the engine and little thought has been given to airfiltering in the documentation that I found about tuning. My question(s): is there any info to the size of the smallest particals that are trapped by a foam filters on the market today? Can anyone point my nose in the right direction concerning better filtering methods (if they exsist)? where can I find info about the theories of airfiltering? -------------------- I am aware of the fact that lifespan of the engine is not the biggest isue when it comes to dirtbikes. Nevertheless I hope to find a way to overcome this problem. High power output is not my goal. Durability is what I´m looking for. Adriaan, spelled my username (dustbite(sic)) wrong, found out too late.... [/QUOTE]

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