Motor wont start, but back fires out the exhaust

[michaelneff22]

I bought a wood chipper with a 5hp B&S motor and when I pull the pull starter it back fires a flame out the exhaust and wont start.

What causes this? I googled some things but didn't find any real good answers.

 

[ILENGINE]

For us to help you properly go read the following thread

http://www.lawnmowerforum.com/site-discussion/36288-how-do-you-change-muffler-belt.html

 

[reynoldston]

It sounds like a valve problem. The very first thing is check your valve adjustment.

 

[Tinkerer200]

It sounds like a valve problem. The very first thing is check your valve adjustment.

OR flywheel key.

Walt Conner