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finally got spark ...then BANG ...BANG


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#16 alec OFFLINE  

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Posted April 23, 2015 - 08:55 PM

thanks trowel !!


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#17 trowel OFFLINE  

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Posted April 23, 2015 - 08:58 PM

I'll check in for progress.

 

Good night.


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#18 alec OFFLINE  

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Posted April 23, 2015 - 09:34 PM

so put another carb on and got nothin . seems like it spins awfully fast :( will be pullin the head



#19 ol' stonebreaker OFFLINE  

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Posted April 23, 2015 - 09:41 PM

Ok, I wanted to make sure, people switch then out sometimes creating more problems.
 
On to the valves. Pull the head, careful not to tare or damage the head gasket. Using your hand turn the engine over until one of the valves is fully closed, you can spin the engine until both valves are fully closed for this test. Put your thumb on it and try twisting it, if either valves twist then it need to be lapped back into the seat.


I beg to differ. If the valve can be moved by twisting when closed it means it's worn into the seat far enough to lose the lash ie: .ooo inches
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#20 karel OFFLINE  

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Posted April 24, 2015 - 06:28 AM

check the fly wheel key way.


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#21 LilysDad ONLINE  

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Posted April 24, 2015 - 07:01 AM

There are all kinds of >BANGs< :wallbanging: ! Is it an ignition bang? Or a connecting rod bang. Or a mower blade bang?


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#22 JDBrian OFFLINE  

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Posted April 24, 2015 - 07:23 AM

Have you got a good snappy blue spark? I'd recheck the point and plug gaps and check the timing to make sure those aren't issues. 


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#23 alec OFFLINE  

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Posted April 24, 2015 - 09:05 AM

There are all kinds of >BANGs< :wallbanging: ! Is it an ignition bang? Or a connecting rod bang. Or a mower blade bang?

loud backfire bang


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#24 LilysDad ONLINE  

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Posted April 24, 2015 - 10:33 AM

Ah! That's almost certainly a timing issue.



#25 LilysDad ONLINE  

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Posted April 24, 2015 - 10:39 AM

I'm most familiar with Kohler K series. A man once told me that the surest way to set timing was with a jumper test light and the timing mark. The light shows the exact time the points open, which should be the moment the timing mark aligns. Does the Briggs have a timing mark?


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#26 trowel OFFLINE  

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Posted April 24, 2015 - 05:25 PM

I beg to differ. If the valve can be moved by twisting when closed it means it's worn into the seat far enough to lose the lash ie: .ooo inches

Beg all you want, tight valves means no leaks. If you have spinning valves, you might want to grind the stem down a bit.

 

Don't believe me, ask around.


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#27 trowel OFFLINE  

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Posted April 24, 2015 - 05:29 PM

loud backfire bang

Those engines have a timing advance, it may not be working correctly. If I have some time I will look at my manual for troubleshooting without having to tare apart the engine.

 

Jim (classic) is very good with the 50's and 60's large bore Briggs, hopefully he will see this thread and lend a hand.


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#28 petrj6 OFFLINE  

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Posted April 24, 2015 - 07:43 PM

   Is .18 correct for the points gap ? seems a bit much to me.  how did you make out ?  get it running ? some of those carbs can be a hassle to get correct especially if they are worn a little.  I am building two motors now with that style carb, great when they work not when they don't.

                                                                                                                    Pete


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#29 trowel OFFLINE  

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Posted April 24, 2015 - 07:44 PM

check the fly wheel key way.

I missed your post, yes, check that too.


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#30 trowel OFFLINE  

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Posted April 24, 2015 - 07:47 PM

   Is .18 correct for the points gap ? seems a bit much to me.  how did you make out ?  get it running ? some of those carbs can be a hassle to get correct especially if they are worn a little.  I am building two motors now with that style carb, great when they work not when they don't.

                                                                                                                    Pete

Pete,

 

I did think of replacing the flowjunk with a Walboro off the Winnie S10D and S12D engines, the throttle lever is on the side of the carb instead of the top, ventures a thought, yes ?


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