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Lawnmower stops when engine is hot - Briggs & Stratton Garden

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Depending on type of mower could be fuel pump or coil over heating and breaking down

Posted on Nov 21, 2013


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I have a poulan pro lawnmower that won't start back up if I stop it after it has been running for a bit. Won't start when the engine is hot.

loosen the fuel cap and see if that helps. if the fuel cap is plugged so it cant breath that will do it. also be sure the engine is clean and the fuel lines are away from the engine

Jun 07, 2017 | Poulan Garden

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My 2 year old craftman lawnmower stopped working because it ran out of oil. I replaced the spark plug , new oil, gas and still won't start. Is it done or can it be repaired?

It's toast. Without oil the pistons get so hot they expand . It could have locked the engine up. Probably best to get a replacement engine for it.

Aug 12, 2014 | Garden

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My lawnmower stopped

Check the oil. I bet you seized the engine.

May 18, 2014 | Honda HRC216HXA Commercial Lawnmower

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Lawnmower starting problems

Hot start problems are almost always valve related. As the engine heats the valve grows a few thousands thus not closing 100%. Here's a test next time it's cold pull it over to gage how strong your compression is, then when it's hot and you shut it down now pull it over and gage how strong your compression is.

My guess is that you have much more compression when cold than when hot... valve problem.

Solution; make sure valve lash is to spec when cold. This is a fairly technical ordeal but basically on the older style flat head engines you have to remove a small amount from the valve stem end to make sure your valve lash is to spec. You'll have to look up the spec and measure it.

Feb 18, 2018 | Craftsman Garden

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I have a gv 100 honda engine on my lawnmower and it is pulling in oil from a breather pipe into the air filter can anyone tell me why

indicates excessive oil in the sump ( check float is not stuck and fuel in leaking into the inlet manifold and into the engine sump)
ring problem allowing excessive blow by into the sump which is collecting oil vapor as it exits to the air filter

May 12, 2012 | Honda HRX217VKA Lawnmower

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Where is the oil plug underneath the mower?

Depending on what engine is on your Toro lawnmower, there may not be a oil plug under the mower deck. A briggs and stratton engine will have one, but if the unit has self propel then you will have to move the guard over the self propel cable. This is a 1/2 in bolt, you will also have to loosen the other bolt to swing the guard around.
On a Kawasaki or Honda, and even if you have a Tecumseh engine then just start the mower up for a few minutes and let the engine oil get warm, then shut the engine off and then lay the mower on the side that has the oil filler cap and put your drain pan under the oil filler cap. You can then drain the oil out of the oil filler tube. You can also do this with the briggs and stratton engine. I find this to be a very convenient way to change the oil.
Then put fresh oil back in the unit. I always suggest to put the engine manufacturer's oil back in the unit, or if that is not available then use another oil from another engine manufacturer. IF you use automotive oil, the oil will break down faster since the heat level for the engine on car is less than that of the engine on your lawnmower. The engine has a water cooled design, that keeps the engine temperature from raising over about 250 degrees F. The engine temp on your lawnmower can get as hot as 400 degrees F in the summer heat and being run for 30 minutes or longer.
A longer answer than you had hoped but I hope the information keeps your lawnmower running well for many summers to come. :)

Apr 04, 2011 | Toro Power Lawn Mower

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