Export thread

Hello I have a 2007 briggs and Stratton yard machines mower not sure on the model number I can get it later.I have tried almost everything to get it started I have replaced the plug I have sprayed starting fluid
This model is one of the mowers that does not have a carb it has the gas tank that is attached to the side of the mower and does not have a carb
At least I can’t find it
Do you have any suggestions
It has 60 psi compression and the spark is sparking
I just can’t seem to get it to fire
Also I have a mower that seized on me recently I had it running this past Sunday and I went out to pull it yesterday and the engine is seized any suggestions on how to prevent this it has oil but is stored outside the weather was not cold but I’m not sure if that was a factor if you have any ideas why it seized or how to prevent or fix it that would be great both are the same brand and both are Briggs and Stratton
Thanks

Locate air cleaner. It is attached to carburetor.

First engine depending on model number could have the carb mounted on top of the fuel tank. On the other mower, remove the spark plug and see if you can turn it over then. if not then try turning the blade by hand with the plug out and see what happens. May turn hard if the flywheel brake isn't released but should at least turn.

Model numbers of the engines would help to assist you on how to proceed.

The one with the seized engine I have tried turning the blade and it is stuck on there
The other one the primer is attached to the side of the gas tank with the air filter on top
If I take the filter off that is how I sprayed the fluid in
I can get the model numbers after work
The one that is seized was running fine on Sunday
I was working on it yesterday and I was turning the blade by hand and it is stuck and won’t turn front or back

Any ideas on the problem on either?
The one that is not running has great spark and compression same with the one that is seized on the seized mower I also separated penatrating oil into the engine block through the spark plug hole

Get us the model number off of the engines so we can see what you are looking at. Too many variable to try to diagnose without numbers.

I'm confused. :anyone:

PTmowerMech said:

I'm confused. :anyone:

Click to expand...

Me too.
How can a seized engine have "great" spark and compression?

The OP is asking about two different mowers.

The one that is not running has great spark and compression same with the one that is seized on the seized mower...

Click to expand...

:confused3:

The mower HAD great spark and compression before it seized

Riley how old is the mower the one that will spin over ??

2007
And an update on the mower that is seized it now has a hole in the side of the block and when moved a certain way the hole gets bigger
Any way to get it fixed or is it done
Sorry to ask dumb questions I’m only 15 and am new to small engine repair
Thanks for all the help

If it has a hole in the block then it is toast with a Capitol T........ Ok you have a L head engine but which one ??? How many HP 3.5 4 6 6.25 ???

3.5

Is this your engine and carb ??

https://youtu.be/LzpSy5CJL6k

Oops I didn't wait on your reply ........ Oh well that video will help you out............

Yes that is my carb and engine style

Well go to a lawn mower shop or I can send you the parts and follow the video and fix it.......

Happy wrenching... I was working on mowers when I was 15 also ...............

If it has a hole in the side of the block then it is deceased.
Deceased engines are the perfect things to pull apart cause no matter what you do you can't make it any worse.
So pull it down, note how everything goes together and put it back together a couple of times.
Sort of a jigsaw puzzel for big kids.
While it is apart, pull the piston off the rod then pull a ring off the piston.
use the bottom of the piston to push the ring into the bore & measure the gap at 1/2" intervals so you can work out where the bore is worn.
All good practice on a body that is already dead.
Look closely at all of the bits and try to work out why it broke.
Put some photos of the con rod, piston, inside & out, gudgeon pin up here if you like and ask some of the techs to explain how to read them.

It is one thing to be able to remove & replace damaged parts to get an engine running.
It is entirely a different thing to work out why it failed so the rebuilt engine does not suffer the same fate.

Bert has some great advice for you right there........ It is a great way to learn about these engines......

First thing you do is check the oil...... If it doesn't have any that's your culprit... I took one in a while back and it had a broken rod 3 pieces in the bottom of the sump....

If you had the govorner wide open holding it with a wire tie or a string that will do it to..... OVER revving will cause a rod to throw and break the block.........

I have seen that tooooo many times in my lifetime.............

Boudreaux In Eunice La. said:

Bert has some great advice for you right there........ It is a great way to learn about these engines......

First thing you do is check the oil...... If it doesn't have any that's your culprit... I took one in a while back and it had a broken rod 3 pieces in the bottom of the sump....

If you had the govorner wide open holding it with a wire tie or a string that will do it to..... OVER revving will cause a rod to throw and break the block.........

I have seen that tooooo many times in my lifetime.............

Click to expand...

tying the throttle open to make the engine run faster for cutting high tough grass use to be very common for people to do. don't see it as much anymore. maybe because the newer engine come apart before they have a chance to run it very long.

ILENGINE said:

tying the throttle open to make the engine run faster for cutting high tough grass use to be very common for people to do. don't see it as much anymore. maybe because the newer engine come apart before they have a chance to run it very long.

Click to expand...

Ya gotta admit though, some of those engines are set too low sometimes. You can attribute that to being a weak spring, in some cases. I'm guilty of bending something to increase the idle.

It is all about blade tip speed and noise.
Hondas spin a bit slower down here ~ 3200 rpm which makes them a lot quieter.
One of the blue smokes went as low as 2750 to get the noise down.

PTmowerMech said:

Ya gotta admit though, some of those engines are set too low sometimes. You can attribute that to being a weak spring, in some cases. I'm guilty of bending something to increase the idle.

Click to expand...

Engine rpm on a pushmower is based off of the length of the blade. The longer the blade the slower the engine runs. 19,000 FPM is the perceived maximum tip speed, and if turned to fast can create a harmonic in the blade causing cracking and blade destruction. That maximum speed is even used on rough cut mowers. A 8 foot rotary cutter may only turn at 900 rpm.

Well, that's some good information. Thanks

I did some research
I had the mower that now has a hole in the side running 3 days before with the muffler offf
Would that have anything to do with it now having a hole in the side and not running?

So what your saying is ,,,,,,, that you are disassembling the engine that had a hole in it ????

I have ran small engine's with just a pipe sticking out for racing Sprint Karts.... Never a problem, but we would stick a cork in the pipe when we shut the engine's off......

Did you get your other engine going ???

ILENGINE said:

Engine rpm on a pushmower is based off of the length of the blade. The longer the blade the slower the engine runs. 19,000 FPM is the perceived maximum tip speed, and if turned to fast can create a harmonic in the blade causing cracking and blade destruction. That maximum speed is even used on rough cut mowers. A 8 foot rotary cutter may only turn at 900 rpm.

Click to expand...

One of the many reasons why swing back blades are so much better for mowing with.

Boudreaux In Eunice La. said:

So what your saying is ,,,,,,, that you are disassembling the engine that had a hole in it ????

I have ran small engine's with just a pipe sticking out for racing Sprint Karts.... Never a problem, but we would stick a cork in the pipe when we shut the engine's off......

Did you get your other engine going ???

Click to expand...

Yes I did the head gasket was out of place/worn
So I replaced it and it runs well