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Briggs 120602-0131-E1 6.5hp ohv

Let someone borrow this last year. Got it back with a bent blade. Nothing but trouble out of it ever since. Will start in 6 pulls with no blade but I hear noise like its sucking air when I'm pulling the cord. I can get to start with a new blade within 10 pulls with sucking air when pulling the cord but wont restart when hot unless I let cool down for 20 minutes to 30 minutes. I replaced spark plug, flywheel key and mower blade. I have extra engine just like it that got in a trade but dont the history on it through.

bent pushrod? stuck/bent valve? blown headgasket? Whatelse do I need to check or say heck this engine and swap the other onto it and get it running.

I would start with the head gasket unless you can pin point where it is sucking air.

Rivets said:

I would start with the head gasket unless you can pin point where it is sucking air.

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Gonna start with a compression test

Try replacing the primer ball gasket that is located in between the air cleaner box and
The carb and clean the carb. Another thing to try is checking the coil gap. I had a 6.5hp come into my shop that wouldnt even start and thats what fixed it. When the blade got bent it could have knocked the coil loose. But i would start with the gasket and cleaning the carb out. That gasket is a common problem for this motor... Poor design

Xbbork said:

Try replacing the primer ball gasket that is located in between the air cleaner box and
The carb and clean the carb. Another thing to try is checking the coil gap. I had a 6.5hp come into my shop that wouldnt even start and thats what fixed it. When the blade got bent it could have knocked the coil loose. But i would start with the gasket and cleaning the carb out. That gasket is a common problem for this motor... Poor design

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Already checked carb and cleaned it. Replaced the air filter base gasket. Have .010 on the air gap.

Have you removed the plastic cover on the top of the motor and cleaned that out? If not it may have grass caked in there and not letting the proper air flow in to the head causing it to over heat

Yes been removed when I replaced the flywheel key.

What did you set your spark plug gap to?
On the OHV model 11 & 12 it should be set at .020".
This can sometimes cure hot start problems. Other thing is make sure the spacer between the carb and engine has not been distorted. File down with emery paper.
Other thing which iv had is if the crank has taken a knock, the flywheel magnets for the coil can lose there magnatism which can make loss of spark.

pugaltitude said:

What did you set your spark plug gap to?
On the OHV model 11 & 12 it should be set at .020".
This can sometimes cure hot start problems. Other thing is make sure the spacer between the carb and engine has not been distorted. File down with emery paper.
Other thing which iv had is if the crank has taken a knock, the flywheel magnets for the coil can lose there magnatism which can make loss of spark.

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I just put in on whatever the pregap is on the torch spark plug.

davbell22602 said:

I just put in on whatever the pregap is on the torch spark plug.

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Set your gap!

pugaltitude said:

Set your gap!

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OK, But this thing ran fine before the guy hit something with it.

davbell22602 said:

OK, But this thing ran fine before the guy hit something with it.

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Which then takes you back to the flywheel magnets. Its very unusual but has happened.
It all depends what checks you have done.
Checking with spark tester with engine running would be my 1st check. (if it does)
A leakdown test on the compression components for sealing would be my next check.
Also what happens if you run a new earth wire to the coil? Maybe the wire is chaffed through or on/off switch faulty.
These are all ideas and have to be elliminated.

pugaltitude said:

Which then takes you back to the flywheel magnets. Its very unusual but has happened.
It all depends what checks you have done.
Checking with spark tester with engine running would be my 1st check. (if it does)
A leakdown test on the compression components for sealing would be my next check.
Also what happens if you run a new earth wire to the coil? Maybe the wire is chaffed through or on/off switch faulty.
These are all ideas and have to be elliminated.

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start/stop switch works. Kills engine when I get it running. Starts easier when cold or warm after sitting shut off for awhile.