225DR wont start

[DLH7LA]

Hey folks, my yamaha 225DR (i think its an '84) won't start...
I must say i'm really a newbie with 3wheelers and my knowledge is pretty small, so please explain me what i can do.

I tried with/without choke, pushing it...
Battery is full, it has enough gas.

I need help, today is such a nice day and i wanna go 4 a ride!!
Thanks

Edit: it worked well a few days ago

[225DX DUDE]

Do you have spark? Try a new plug.

Post up a picture of your 225DR and we will tell you what year it is.

[Yamada]

To check for spark, remove the spark plug from the engine head, reconnect it in the wire boot and ground the tip of the spark on the frame or the engine. While you check for spark have someone pull the recoil for you.
A new spark plug is a good idea.