Hi guys, I just bought a new old stock 2004 WR450. I am returning to the sport after a three year hiatus to finish my bachelor's degree. I rode my bike for the first time yesterday. It felt like the bike loads up and surges at low speeds. I was slipping the clutch just to mitigate the surging. Is this normal? It almost felt like it would stumble then hit when opening the throttle ever so slightly. I would like to try to smooth out the power to make it pretty linear. What do you guys suggest? Other info, 6'2" 260 pound rider. Bonestock bike, baffle and all. 99% of all riding is below 3500 ft. Yesterday was at about 1500 ft. Novice to intermediate rider. I want to putt along with my boys on their 50s and still be able to open it up with friends. I am open to mods but like the bike quiet.