I did a search over the forum to find if someone was reporting similar problems but I couldn't find any relevant. I got few reports from different yammy race teams that the new 06 450 engine has a lot of problems: maintenance has to be extremely frequent; intake valves failures. This last is so evident that I'm hearing that Yamaha EU ran out of 06 valve and some mec. are suggesting to swap back to 05 valves. Now, not seeing nothing in this forum it sounds me strange as I think EU and USA version are pretty similar than. Did someone heard something similar or experienced similar problems? Thanks.