i did a 30km run at 6000rpm and the engine seemed happy ,doing well...
i did find alot of il in the airfilter box.
could i run a straight tube up with one breather filter on top instead of the whole setup with the box in between?
it is offcourse better to stay below 5500-5000 rpm for long travels, but i don't really worry if i go over... engine is bullit proof they say :-p