hello I recently perches'ed a 1999 honda fourtrax 300 4X4 and it was burning oil so I got a gasket kit and took the engine apart removed the old gaskets and seals and installed the new ones then put it back together and adjusted the timing then I went to start it and I had to give it a bit of throttle for it to start and the it would run really rough. Why? It allways ran vary well and smooth.