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Offline Mow guard

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motor no start
« on: September 21, 2013, 09:55:39 pm »
Ok 31 briggs ran good yesterday started today ran fine then started later that day it would not start i pulled the fflywheel nut off and looked at the key from the top it looks fine but is it possible that i can still be sheared because its back fireing through the carburator. it has fuel and spark.
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Offline anzadon

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Re: motor no start
« Reply #1 on: September 21, 2013, 10:02:37 pm »
Sheared keys often look good from the top
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Offline leadslead

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Re: motor no start
« Reply #2 on: September 22, 2013, 05:54:03 am »
I always mark mine with a line so u can tell if it poped or not
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STEVE HENDERSON

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Re: motor no start
« Reply #3 on: September 22, 2013, 02:21:35 pm »
the key is good springs look good now it will only kinda start with throttle wide open with long cranking. and dumping fuel though intake it still sounds like timing and it is still back firing through carb
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Offline Mow guard

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Re: motor no start
« Reply #4 on: September 22, 2013, 03:09:30 pm »
swapped coils still same issue regaped plug to.
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Offline redline

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Re: motor no start
« Reply #5 on: September 22, 2013, 03:44:02 pm »
Did you actually remove the flywheel to inspect the key, or just the nut/bolt?
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Ed King

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Offline The Tank

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Re: motor no start
« Reply #6 on: September 22, 2013, 03:55:10 pm »
Is it an older syncro balanced engine or a newer avs engine?
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Frank "The Tank" Woods

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Re: motor no start
« Reply #7 on: September 22, 2013, 04:00:13 pm »
i actually removed the flywheel and inspected crank and flywheel for key condition also all i know is its got the bolt in crank NOT nut not sure if its a avs is there a way to tell/
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Offline The Tank

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Re: motor no start
« Reply #8 on: September 22, 2013, 04:06:24 pm »
Avs engine the dipstick tube goes into the block. The older non avs engine the dipstick tube goes into the crankcase cover. Most avs engines also have a plastic engine shroud.
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Frank "The Tank" Woods

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Re: motor no start
« Reply #9 on: September 22, 2013, 04:27:57 pm »
Quote from: The Tank on September 22, 2013, 04:06:24 pm
Avs engine the dipstick tube goes into the block. The older non avs engine the dipstick tube goes into the crankcase cover. Most avs engines also have a plastic engine shroud.

the shroud has been changed due to a flip over and the dip stick goes down into the oilpan block.
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Offline The Tank

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Re: motor no start
« Reply #10 on: September 22, 2013, 04:49:44 pm »
You have one of the older non avs engines then. Had it been an avs engine, I was gonna say one of the press on cam lobes could have came loose but all the non avs engines had a cast cam.
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Frank "The Tank" Woods

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Re: motor no start
« Reply #11 on: September 22, 2013, 05:07:26 pm »
any ideas?
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Offline The Tank

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Re: motor no start
« Reply #12 on: September 22, 2013, 05:15:53 pm »
Stock cam or race cam? Have u checked valve lash?
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Frank "The Tank" Woods

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Re: motor no start
« Reply #13 on: September 22, 2013, 06:44:26 pm »
Stock cam Stock motor no i have not dont have a feeler guage to do so they did feel a little loose but not really loose also pulled the head off and check the intake valve all seems good but still have the issue
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Offline The Tank

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Re: motor no start
« Reply #14 on: September 22, 2013, 07:42:15 pm »
Man get you a set of feeler gauges or at least borrow some. Check lash. Here are the specs:

Intake: .003-.005

Exhaust: .005-.007
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Frank "The Tank" Woods

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