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


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#1 alec OFFLINE  

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Posted April 23, 2015 - 08:15 PM

allis B112, cleaned the  brand new points after setting the gap at .18 . finally got a spark . put some gas to it and all I got was a loud BANG :wallbanging:  followed by another :wallbanging:  . I have been studying about points and spark and remember someone saying this same thing happened to them . decided to remove carb and clean it ( just cuz its gross ) any help would be greatly appreciated !!!!!



#2 adamjd200 OFFLINE  

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Posted April 23, 2015 - 08:17 PM

Is your spark plug still in place?


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#3 MH81 ONLINE  

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Posted April 23, 2015 - 08:20 PM

Sounds like valve or timing. Are you sure the gap is right? How about the speed it's turning over?
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#4 alec OFFLINE  

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Posted April 23, 2015 - 08:28 PM

spark plug is in . :bigrofl: I should double check that !!( just dawned on me what you meant . thought it was a stange question at first ... )

 

tried real hard to gap it right . it turns over faster than my B221 .


Edited by alec, April 23, 2015 - 08:32 PM.

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#5 trowel OFFLINE  

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Posted April 23, 2015 - 08:32 PM

The old cast iron Briggs do that sometimes when the carb is not right. If it continues with the carb rebuilt then It could be the timing advance.


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#6 alec OFFLINE  

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Posted April 23, 2015 - 08:34 PM

The old cast iron Briggs do that sometimes when the carb is not right. If it continues with the carb rebuilt then It could be the timing advance.

the bottom of the carb filled with gas . this not normal right ?



#7 trowel OFFLINE  

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Posted April 23, 2015 - 08:35 PM

You mean the mouth of the carb ?



#8 alec OFFLINE  

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Posted April 23, 2015 - 08:39 PM

You mean the mouth of the carb ?

that may be the case . Im learning . at least I finally know what a footdragger is hahaha only took a year + hahaha



#9 trowel OFFLINE  

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Posted April 23, 2015 - 08:44 PM

Here's mines.unnamedBHKLAC27.jpg

 

Here are two pictures of carbs, which one is closet to the one you have ?

 

untitled.png untitledw.png


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#10 tater195 ONLINE  

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Posted April 23, 2015 - 08:45 PM

If it turn over fast, you probably have a valve issue
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#11 alec OFFLINE  

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Posted April 23, 2015 - 08:45 PM

the one on the left .



#12 alec OFFLINE  

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Posted April 23, 2015 - 08:47 PM

whats the best way to check the valves ?



#13 tater195 ONLINE  

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Posted April 23, 2015 - 08:49 PM

Compression tester to verify, then pull the head and look at the valves
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#14 trowel OFFLINE  

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Posted April 23, 2015 - 08:51 PM

the one on the left .

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.


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#15 trowel OFFLINE  

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Posted April 23, 2015 - 08:51 PM

Compression tester to verify, then pull the head and look at the valves

All yours then Taters. I am going to bed.


Edited by trowel, April 23, 2015 - 08:54 PM.

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