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Murray 22 In. Push Lawnmower starting Problem


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01-17-05, 07:32 AM   #1  
blakeas
Murray 22 In. Push Lawnmower starting Problem

I was just given an old Murray 22 In. Lawnmower with a Briggs & Stratton Sprint 3.75 HP engine. It looks like an older model and i tried to start it (I put in new gas) and it would not start. I am not familiar with this engine, Where can i go online so i can research how to repair it? I took the cap where the puller mechanism is located and able to fix that but it still will not start. You can email me if you would like. Thanks in advance for the help!!

Moderator's note: I removed the email address from your post. Sorry, but forum rules do not allow email addresses in the forums. You may list your address (if you haven't already) in your profile and refer others to that if you'd like. There was no harm in the way you posted your email address, but there are cases where it can be a problem, and for that reason we don't allow email addresses at all in the posts..........cheese


Last edited by cheese; 01-18-05 at 11:24 PM.
 
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01-17-05, 11:33 PM   #2  
Hello blakeas!

First, check for spark. If you have spark, drip some gas into the carburetor or spark plug hole and try to start it. If it starts and then stalls, yoy have carburetor problems. Pick up a diaphragm and clean the carb, tank, and replace the carb diaphragm.


"Who is John Galt?" - Ayn Rand (Atlas Shrugged)

God bless!

 
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01-18-05, 08:56 AM   #3  
Trob
1. Is the flywheel magnet rusty? I have had to clean that sometimes to get a good spark to the magneto.

2. Have you changed the condenser? Take the flywheel off, it is usually under a small light weight metal cover. Go ahead and change the points also.

3. If it is getting spark, check the flywheel alighnment key way. If it has been sheared or out of place even slightly, the timing will be off and it will never crank.

4. Another problem I have had with the old type Briggs engine is: For some reason, the carburetor butterfly won't open when cranking. Choke the engine, then if it won't crank, take the air breather off and stick a screwdriver in the carbutetor to hold the butterfly open. After it cranks, you can put the breather back on.

 
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01-18-05, 09:30 AM   #4  
blakeas
Thanks for the reply! I appreciate the advice - is there a diagram i can refer to , to do the things that you guys ask? I am not familiar with the engine and i wanted to be sure i can look at something to guide me. Anything online? Thanks!

 
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01-24-05, 11:03 AM   #5  
Posted By: Trob 1. Is the flywheel magnet rusty? I have had to clean that sometimes to get a good spark to the magneto.

I was told by a mechanic that the rust on the magnets does not affect the spark? Does it really make a difference?

 
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01-24-05, 10:25 PM   #6  
No, I've never seen any instance when rust on the flywheel kept the ignition from working. It's just a magnetic field, and rust doesn't stop that.


"Who is John Galt?" - Ayn Rand (Atlas Shrugged)

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01-25-05, 08:19 AM   #7  
Azis
http://www.briggsandstratton.com/dis...sp?DocID=64103
If you get the model # off your engine you can download manuals from briggs at their site, follow the link above.
I would start just as Cheese suggested. Once the problem is determined you should also find a parts listing on the same site for part #'s.
I am not 100% sure but I think 22" murray, and 3.75HP briggs, will not be old enuff to use points and condensor. If you have no spark, remove the ground wire from the coil and test for spark. If spark is now present there is a short in the ground wire, (will go to the kill bar..switch) If spark is still not present then the coil needs to be replaced.
Rust on the flywheel will not inhibit spark unless it is built up to the point that it causes clearance issues.

 
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