Hi guys. Im new to the whole ltr 450 game and got a few questions. My quad started right up for the first couple days after i bought it and now it is very hard to start when cold. It will crank and crank and will eventually start once i give it a few blips with the throttle ( i know thats not supposed to happen). I took it into the local shop and the valves are in spec and they recommended i check over the fuel system. Already tried a new fuel pump, fpr has correct amount of pressure, filters are clean, and spark plug has spark. Could i be needing a new fuel injector? Any help is appreciated!