Trouble idling down.

[sandshark]

I have a predator 90..When running for a few mins it has trouble idling down ..when i shut the key off it runs for about 5 secs...any suggestions on how to fix this...

[EthansDad]

Sounds like an air leak. Check in take boots for leaks and around cylinder and head. Also around crank shaft.

[sandshark]

I found a blown head gasket...

[dericsdad]

That is probably why your compression is down when u test it also. When redoing the top end it's a good idea to replace the crank seals too.