What Would Prevent an Engine From Starting
Engine Starter Problems
Most engine starting problems are due to stale old fuel, or dirt and debris in the fuel system. Another common cause (for lawnmowers) is making sure to hold on to the safety bail when starting/pulling the rewind cord.
Many engine performance problems can be linked to maintenance issues such as stale fuel, dirty air filter, fouled spark plug, and deteriorated oil.
A great way to help avoid these problems would be to perform an annual tune-up using a Briggs & Stratton engine Maintenance Kit.
If this is the problem:
Ask this question:
If the answer is yes:
Engine won't start
Is the shut-off valve closed?
Is the fuel diluted
Is the fuel line or inlet screen blocked?
Is the fuel tank cap clogged or un-vented?
Is the carburetor blocked?
Remove the spark plug lead and spark plug; pour a teaspoon of fuel directly into the cylinder; reinsert the spark plug and lead; start the engine; if it runs for a moment before quitting, overhaul the carburetor (see "Adjusting the Carburetor").
Is the fuel solenoid
(if equipped) functioning properly?
Is the spark plug fouled?
Is the spark plug gap set incorrectly?
Is the spark plug
Is the kill switch shorted?
Is the flywheel key damaged? Did the engine stop all-of-the-sudden after striking an object?
Did the engine abruptly stop (ex. blade strike an object)? See if the flywheel key is sheared. If so, replace the flywheel key, re-torque the flywheel nut to proper specifications, then try to start the engine; if it still won't start, check the ignition armature, wire connections or, in some engines, the points (see "Replacing the Ignition").
Are the valves, piston, cylinder or connecting rod damaged?
Please also visit our Engine Won't Start and Engine Starts Then Shuts Down FAQs for related information.
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