Craftsman 6.25 HP lawn mower starting problem model 917.377211?

craftman Lawnmower problems.
Here are some common areas to look at.
Assuming you have good spark....
Assuming you have not run over any tree stumps……
The Air filter could be plugged with debris.
Prime the gas line using the primer bulb.
The gas line may have air in it- check to see if fittings are tight (replace the fuel line). Check to see if the spark plug is set at the correct thousands of an inch.
If the lawnmower smokes or you need to add oil each time you run it- then you have bad rings or valves and this will decrease the compression and foul the spark plug, if this happens it will be cheaper to replace the mower.
New engines now days are cheap but, they have non adjusting tuneable carburetors and have no fuel bulbs to empty debris and the end result is the carburetor wears out fast and the engine is not worth the time and money to fix. My best guess is you have air seeping into the fuel line and it would be caused by a bad connection on one of the ends of the fuel line or the the fuel pump in the carburetor is starting to wear out.

fixityourself
July 2007