I have a WR400 1999 model and iv'e had the oil changed at a garage and they put loads too much in. I first noticed when it wouldn't rev out correctly on top end and it wasn't as quick to get up to speed. I checked the oil it was about 3" above the top mark on the dipstick. I have drained the oil out to the right level and its still not reving right or am i imagining it, could this of damaged my bike ?????