Restart problem

[Snowmobiler]

Stock 62t Engine. After the engine is heat soaked it will not start (cranks but no fire). Wait five minutes and it starts right up.

Any suggestions on where to start?
Stator?

Thanks for the help.

 

[khaos]

Possible Worn out plug wires. Heat raises resistance. Worn out wires makes a worn out coil...

 

[Snowmobiler]

OK, the wires do look original. I did trim the wires back and put new boots on a couple months ago as the boots were falling apart. The wires do have a few wear marks from rubbing.

Can I replace just the wires, Or should the coils be replaced also?