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Briggs 8 Hp


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#1 LTD OFFLINE  

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Posted July 17, 2012 - 06:21 PM

Hey everybody. I have this Troy built tiller with a 1970's Briggs and Stratton 8HP engine; that will not run. It has gas,spark and compression. It backfires out of the carb. The valves are fine. The carb. was cleaned and rebuilt. I was thinking maybe the carb is adjusted wrong??? Was wondering what you guys thought?

#2 dogsoldier OFFLINE  

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Posted July 17, 2012 - 06:29 PM

sounds like a fly wheel key may be bent or broke. have you tried to adjust the carb?
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#3 MH81 ONLINE  

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Posted July 17, 2012 - 06:31 PM

Is it possible that the key is sheared on the flywheel? If it's far enough off, it will backfire badly.

My first thought was intake valve, but you'd have low compression. What is the compression, anyways?
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#4 MH81 ONLINE  

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Posted July 17, 2012 - 06:32 PM

:bigrofl: DS, We both posted the same thing within a minute of each other. :)

Your post went thru while I was typing mine.
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#5 LTD OFFLINE  

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Posted July 17, 2012 - 06:32 PM

sounds like a fly wheel key may be bent or broke. have you tried to adjust the carb?

I had the flywheel off. The key was sheared so I replaced it. Still no luck. I did fiddle with the carb. adjustments some but I'm not sure where they should be set at.

#6 LTD OFFLINE  

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Posted July 17, 2012 - 06:36 PM

Is it possible that the key is sheared on the flywheel? If it's far enough off, it will backfire badly.

My first thought was intake valve, but you'd have low compression. What is the compression, anyways?

I don't have a tester but by pulling it over by hand
I can tell you it is fine(It almost killed me pulling it over in the 97* heat today).

#7 MH81 ONLINE  

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Posted July 17, 2012 - 06:42 PM

If you could post the model number of the engine, maybe someone could help more.
I wonder if it came with an offset key?
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#8 HDWildBill OFFLINE  

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Posted July 17, 2012 - 06:52 PM

Try replacing the spark plug. I've seen brand new ones do this as well as old ones.
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#9 LTD OFFLINE  

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Posted July 17, 2012 - 06:55 PM

If you could post the model number of the engine, maybe someone could help more.
I wonder if it came with an offset key?

The model number is 195432.

#10 New.Canadian.DB.Owner OFFLINE  

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Posted July 17, 2012 - 06:56 PM

There are a number of B&S manuals in the Manuals section (click on the Manuals tab at the top of the page). The Repairman's Handbook deals with carbs on older engines.

There are also some on-line at sites like: http://www.oldengine...ton_manuals.htm


Poster accepts no liability for anything you may encounter on-line & explicitly says "BEWARE". I'm not issuing a recommendation of that site, merely saying Google is my friend.
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#11 LTD OFFLINE  

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Posted July 17, 2012 - 07:11 PM

Bill, It has a brand new plug and magnatron in it.

Edited by LTD, July 17, 2012 - 07:11 PM.


#12 New.Canadian.DB.Owner OFFLINE  

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Posted July 17, 2012 - 07:17 PM

The parts list on the Briggs website (i used model 195432-0280-01) gives a flywheel key PN of 22698 (item 24) and does not list it as an offset key. Googling that part number shows images of it as a normal key.

http://www.briggsand...1&ipl_id=164900
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#13 JDBrian OFFLINE  

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Posted July 17, 2012 - 07:22 PM

Is there any way to adjust the timing on those engines. I wonder if it's out of time somehow. Is the plug wet after cranking it?
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#14 MH81 ONLINE  

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Posted July 17, 2012 - 07:56 PM

Is it possible that the magnetron is on upside down? That would drastically change the timing.
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#15 HDWildBill OFFLINE  

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Posted July 17, 2012 - 10:28 PM

Bill, It has a brand new plug and magnatron in it.


I was at a buddy's when he put a brand new plug in a GT during a service. When he fired it up it coughed backfired and sounded like crap. He started thinking about all kinds of things and I asked him did it do this before you replaced the plug and the answer was no. He put the old plug back in and it ran normal. He got another new plug and it was OK.

2 weeks later I get a GT in the shop and it is backfiring and running like garbage. Replaced the plug and everything was fine. For the price of a new plug it is an easy fix so that is the first thing I do.
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