So, I just bought a 2000 Honda 400ex. It started when i test drove it and when i brought it home two days ago. But now it just won't start and it is about 42degrees out right now and i have a heater on it trying to warm it up. . I was wondering if anyone could tell me to try something because all i could think of is somehow the sparkplug went bad or it is just too cold. I am new to four wheelers so i don't know too much about them. Please help.