Need more info- as much as you can give us!
The engine cranks, (turns over) and tries to start but no start, yes/no?
KILL switch in proper position?
Brake light lights when you turn on key and pull the brake lever?
How many miles?
Are you the original owner?
Crashes?
Last time it ran fine, then what.....?
Battery condition?...have you tried starting it with a KNOWN good other battery?
What condition is the plug when you look at it?
Good spark if your ground the spark plug?
Tried starter fluid sprayed in the air intake?
You need compression, spark and fuel to run....Compression when you put finger in plug hole?
Valves checked for proper gap?
Please respond....lot of good wrenches here.
Stig