My bike wasn't brand new when I bought it. On the day I picked it up I watched the previous owner start the bike easily.
In the excitement of the day I forgot to ask him how he did it, and I didn't read the manual.
As soon as I got it home I just tried to start it the same way I'd started all of my carbed bikes.
Figured it's a big badazz 450, so I'd have to kick it as hard as I could. I may have unintentionally given it some throttle too.
It wouldn't start, so I cleaned the plug. It still didn't start. I think I got one backfire out of what felt like 500 kicks. I even tried to bump start it, and it wouldn't even fart.
Took the plug out, cleaned it, and let it sit on the bench overnight with no plug in the cylinder head so I'd be sure it's dried out.
Tried to start it the next morning, no luck at all.
I decided that since I had just seen the po easily start it, I would start with a new plug.
Ended up putting the Iridium version of the factory plug, which is an NGK CR8EIX.
The bike fired right up in about 3 kicks. It's fired up ever since.