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briggs and stratton mower engine won't start

b/s 6.5 hp engine has spark, compression, and fuel but still won't start. It will not even fire once.

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5 Answers from these members:
Mark T
John,






Thank you for the reply. If you do not have any suction at the carburetor, I recommend taking the intake off at the engine block. Then hold your hand over the hole in the block. Once you have it sealed, turn the flywheel by hand. You should feel the suction. If you do not feel the suction, the valve is opening, and closing the problem could be a blown head gasket, broken connecting rod, or the rings are not sealing against the cylinder wall. If you do have suction, the problem is in the intake tube or the gaskets on each end.






I hope this is helpful. Please let me know what you find.






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Mark
by Mark T Earned 1,607 community points in Lawn Mowers
October 23rd, 2012
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Manage My Life
Thanks for answering Mark, There is no suction at the carb, the tube looks good,and I replaced the gasket. Could the problem be the seal on the intake valve? I cleaned up the valves and lapped them in with valve grinding compound. They are opening and closing just fine'
by Manage My Life
October 16th, 2012
Answered in 17 hours
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Mark T
Thank you for your question.

I am sorry you are having a problem with the mower. If the fuel is not getting to the cylinder and you have compression the problem with be a broken intake manifold or the intake valve is not opening. First, remove the air filter and place your finger over the opening for the carburetor. Once you have it sealed off, pull the starter rope. When the engine turns over you should feel suction. If you do not feel any suction, remove the top of the engine so you can inspect the intake tube. If the tube is broken, it has to be replaced. If the tube is fine, you have to check the intake valve. To do that, you have to remove the head. Then turn the flywheel and watch the valves. The valves should open and close. If the valve does not open, the problem is likely a broken camshaft.



I hope this is helpful. Please let me know if you need further assistance.

Thank you for using Manage my life.

Mark T.
by Mark T Earned 1,607 community points in Lawn Mowers
October 16th, 2012
Answered in 15 hours
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Manage My Life
The mod.# of this engine is 125k05 0186 e1. I poured a small amount of gas into the carb but it just doesn't seem to be sucked into the spark area of the head.
by Manage My Life
October 15th, 2012
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Manage My Life
The engine not starting can be concerning. I found some information for you that I am hoping will help you until your expert answers your question. I am adding the link below to help you with your question while you wait for your expert response. To better help your expert, I would like to suggest adding your model number. It may take 24-48 hours. I do hope that this will help you out.
by Manage My Life
October 15th, 2012
Answered in 5 minutes
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