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LT12H resto and re-build


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#61 aevansgatech OFFLINE  

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Posted June 24, 2015 - 01:08 PM

Thanks Charlie,

I did replace the needle when I did the carb kit, so I'll double check that I have it seating properly

 

 

There's also a "knob" on the end of the fuel line connector. Should this be all the way open or "tuned" somehow?



#62 aevansgatech OFFLINE  

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Posted June 26, 2015 - 05:38 PM

Took the float bowl back off and made sure the needle/seat are in there properly. I think there was a restriction on the float before

Still having spark issues though. I get nothing even though it's a new armature, business card air gap, and new spark plug. The coil itself looked great when I had the flywheel off. Puzzled...

On a side note I didn't get a good picture before disassembly of where this yellow wire should go.. I'm assuming it's a ground of some sort. I really don't think it goes where I have it in the picture

ImageUploadedByTapatalk1435358278.259637.jpg

#63 KennyP OFFLINE  

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Posted June 26, 2015 - 05:49 PM

Have you checked out the service manual for these?



#64 aevansgatech OFFLINE  

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Posted June 26, 2015 - 06:20 PM

The LGT12 is different isn't it Kenny?

I didn't see a manual specifically for the LT12H but I'm working through some of the Briggs manuals. That's one of the issues I'm having is I haven't found the wiring diagram for my specific tractor

#65 KennyP OFFLINE  

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Posted June 26, 2015 - 06:22 PM

That says it is for the 12 & 17 HP Gear & hydro models!



#66 aevansgatech OFFLINE  

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Posted June 26, 2015 - 06:24 PM

Oh you're right! Thanks Kenny I'll download this one and check it out

#67 aevansgatech OFFLINE  

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Posted June 29, 2015 - 07:09 PM

Finally achieved spark!

New armature went in and I set the gap, re-checked the spark plug gap, and all the safety switches

I now have spark, but what seems like a timing issue. I backfire with each engine rotation

http://youtu.be/wRNL8U-ABik

#68 KennyP OFFLINE  

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Posted June 29, 2015 - 07:12 PM

Quit eating beans!



#69 aevansgatech OFFLINE  

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Posted June 29, 2015 - 07:22 PM

That's a backfiring problem I can't get rid of!

Well the only thing I can think of is the camshaft, but I aligned it like so

ImageUploadedByTapatalk1435623736.108680.jpg

Can bad carb adjustments cause backfiring?

#70 KennyP OFFLINE  

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Posted June 29, 2015 - 07:36 PM

I had a K341 giving me all kinds of sass. Turned out the bushings on the throttle shaft were gone. So look into that!



#71 Chopperhed OFFLINE  

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Posted June 30, 2015 - 04:27 PM

That's a backfiring problem I can't get rid of!

Well the only thing I can think of is the camshaft, but I aligned it like so

attachicon.gifImageUploadedByTapatalk1435623736.108680.jpg

Can bad carb adjustments cause backfiring?

Yes a badly lean condition will cause backfiring on occasion. Especially if there is carbon in the combustion chamber. I suspect the combustion chamber is clean since you had it apart.

 

The other thing I would suspect is something holding the intake valve open.



#72 KennyP OFFLINE  

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Posted June 30, 2015 - 05:07 PM

Or a hole in the muffler



#73 aevansgatech OFFLINE  

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Posted June 30, 2015 - 07:00 PM

Hole in the muffler?

I actually have no exhaust/muffler on it at the moment

I'm leaning towards not aligning the timing gear properly. I need to pull the engine again and check that out




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