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Discussion Starter · #1 ·
Hello to all.

This afternoon I went out to mow the grass. While I was doing the area along the road I ran over some green twine that got wrapped around the blade and stalled the engine.

Now I cant get the mower started. Its a B&S 3.5hp model 92902. I'm thinking it may be a problem with the spark. I see what appears to be oil and gas coming from the muffler and when I took off the air filter it was spitting gas up thru the carb. I'm totally stumped and more than a little frustrated. I tried to check the spark, but I cant pull the starter and see the front of the mower at the same time. It has always run well and starts on the first pull.

Any ideas on what could have happened to this thing? It didnt suddenly stop running, it was like going thru tall grass - it slowed down and then stalled.

Thanks for any & all help !
 

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Sounds to me like a valve may be stuck or the crankcase breather may be allowing oil up into the carb. Can you test for compression by holding a finger over the spark plug hold and have someone pull the rope? Test for spark by trading places and have someone hold the plug wire while you pull the rope??
 

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Discussion Starter · #4 ·
Thanks so much for the help !!!

So far I checked the key and it was not sheared off - it looks OK.

I took the spark plug out and pulled it a few times to clean out the cylinder. What would cause a valve not to close, and how could I fix it ?

It seems as though there is a problem with the timing and/or the spark. Is there anything alse I can check?

Any ideas will help
 

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You can pick yourself up an inexpensive spark tester froom an auto parts store to test the spark. Did you remove the flywheel to ckeck the key?
 

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Discussion Starter · #6 ·
I did remove the flywheel. Actually everything looked pretty good. Like I said this thing ran great and started up on the first pull. I cant believe I cant get it started !
 

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Your missing something about the flywheel. You said it looked "pretty good". A sheared key can look perfect from the top. Replace the flywheel key just for the fun of it! Good luck.
 

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Please forgive me for asking a foolish question - were you able to remove ALL of the twine? Remove the blade to be sure nothing is wedged around the shaft. You did mention, however that you can pull the starter, but have you noticed any increase in resistance when attempting to start/ I'll have to think more about the engine's internal momentum and the rapid stop
 

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Hey, man! This thread has been dead for a while (3 years)! You'll have more luck if you respond to newer discussions. ;) :2th:
Thanks for the quick and valuable lesson - to check the DATE of the post, before offering any assistance. Glad I could give you and biketrax a chuckle or two.
 
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