I have had problems with my scooter, it's a Sprint Jet 800, a copy of Yamaha's gp800

When I go to start the starter motor running as it should but not to engine fires, I get no spark to my spark plugs, what can the problem be on my scooter, where do I start checking for errors? I bought new spark plugs but no spark in them either?

My old plugs were black with oil and wet when I took them out and there was oil around the pins,

Hope you understand my English, direct translation from Google Translate, please help me!