2005 WR450F 1) Is there a trick to getting the oil screen out during an oil change? I put a pretty long wrench on it and I couldn't budge it (the blue painted 19mm in between the front frame tubs that the oil hose connects to). Before I go stripping it with too much force - I wanna make sure I'm not doing something wrong. Yes, I'm doing "Lefty Loosey" (pulling the wrench towards the "Brake lever" side of the bike). 2) As its getting warmer here in Dallas, my bike is getting lean.. popping/backfire when off the throttle. I've not de-restricted it in any way.. its fully stock. Is there a way I can richen it up WITHOUT pulling the carbs to do the jetting? If I do want to adjust the jetting - which way should I move the clip to get richer? tia, Edward p.s. forgive me for any stupidity - been riding & wrenching street bikes for 20+ years but I'm new to high-maintenance dirt.