what do i have to replace if i have no spark on a john deere snowmobile?

[JaredWardall]

i have a 1977 john deere cyclone 440. i started it and started to go and 5' later it died. it was running fine 5 min ago. i think its getting fuel. but i noticed it had no spark. what does this mean? what do i have to replace? or what can the problem be?
i have a 1977 john deere cyclone 440. i started it and started to go and 5' later it died. it was running fine 5 min ago. i think its getting fuel. but i noticed it had no spark. what does this mean? what do i have to replace? or what can the problem be? i tried changing spark plugs. didnt help. what is a magneto and where is it and how do i clean it?

 

[TheGeneral1]

try replacing the plug, the wires and coil, if that doesn't work you might need professional help

 

[sixpackof12m]

bad spark plug try a new one or try cleaning up the magnito