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 12.5 HP B&S Starting Issues.

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AllisKidD21
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PostSubject: 12.5 HP B&S Starting Issues.   12.5 HP B&S Starting Issues. Icon_minitimeDecember 1st 2017, 7:27 pm

Hi! I have a B&S 12.5 that has starting issues, and I can't diagnose the issue. I just rebuilt it, valve job, new carb, spark plug, ignition coil, head gasket, and fuel line.
I rebuilt it in an MTD chassis that I didn't like and it started when it was on that chassis.  I moved it to the Craftsman chassis, and it still started, and I waited about a week for the pulley to show up. In that time there was no gas in the carb. I installed the pulley and belt, and then started it, but didn't have time to try to drive it.  The next day, it won't start at all.  12.5 HP B&S Starting Issues. 2429134702  It has compression, spark, air, and gas.  It won't even fire when I use starter fluid.
I don't think the ignition key or the timing is off, but I will look into that if ya'll think I should.  I just didn't know what to do, so...any suggestions?
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AllisKidD21
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PostSubject: Re: 12.5 HP B&S Starting Issues.   12.5 HP B&S Starting Issues. Icon_minitimeDecember 1st 2017, 7:34 pm

If it won't fire even on starting fluid, and you're sure it has good spark and compression, I'd think that the spark timing was off. Maybe the flywheel key sheared off for some reason. Did you have the flywheel off at any point? If so did you torque the nut down to spec?


"This'll either wake you up or put you to sleep forever!"- Red Green         "Whatever you do you should do right, even if it's something wrong." - Hank Hill
     
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 Garden Tractor Collection: Allis B-110 x2, 710, 716, & 410 - Wheel Horse 655, 953 & 500 Special - Case 444 - Bolens Versamatic, G10 & 1668 Diesel Swapped - Cub 106, 124 & 1000/149 Frankentractor - Ford 120, LGT 125 & 145 - White 1650 Yard Boss - Moto Mower 710-100
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Double W Cross Ranch
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PostSubject: Re: 12.5 HP B&S Starting Issues.   12.5 HP B&S Starting Issues. Icon_minitimeDecember 1st 2017, 7:37 pm

I didn't take the flywheel off. I think the plastic cover under the mesh is missing a bolt. Would that make that big of a deal? It's been missing for as long as I've had it and it has started before.
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AllisKidD21
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PostSubject: Re: 12.5 HP B&S Starting Issues.   12.5 HP B&S Starting Issues. Icon_minitimeDecember 1st 2017, 7:54 pm

I'm not sure what you mean by plastic cover, you mean the plastic cooling fins under the mesh?


"This'll either wake you up or put you to sleep forever!"- Red Green         "Whatever you do you should do right, even if it's something wrong." - Hank Hill
     
      - MTD Off-Road Build
      - Ford LT 110 Off-Road Build
      - Craftsman GT 6000 Off-Road Build
       - Sears LT11 Rat Rod Build *2019 Build-Off Winner!*


 Garden Tractor Collection: Allis B-110 x2, 710, 716, & 410 - Wheel Horse 655, 953 & 500 Special - Case 444 - Bolens Versamatic, G10 & 1668 Diesel Swapped - Cub 106, 124 & 1000/149 Frankentractor - Ford 120, LGT 125 & 145 - White 1650 Yard Boss - Moto Mower 710-100
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Double W Cross Ranch
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PostSubject: Re: 12.5 HP B&S Starting Issues.   12.5 HP B&S Starting Issues. Icon_minitimeDecember 1st 2017, 7:56 pm

Yeah.
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PostSubject: Re: 12.5 HP B&S Starting Issues.   12.5 HP B&S Starting Issues. Icon_minitimeDecember 1st 2017, 7:58 pm

Yeah I dont really think that would be too much of an issue.


"This'll either wake you up or put you to sleep forever!"- Red Green         "Whatever you do you should do right, even if it's something wrong." - Hank Hill
     
      - MTD Off-Road Build
      - Ford LT 110 Off-Road Build
      - Craftsman GT 6000 Off-Road Build
       - Sears LT11 Rat Rod Build *2019 Build-Off Winner!*


 Garden Tractor Collection: Allis B-110 x2, 710, 716, & 410 - Wheel Horse 655, 953 & 500 Special - Case 444 - Bolens Versamatic, G10 & 1668 Diesel Swapped - Cub 106, 124 & 1000/149 Frankentractor - Ford 120, LGT 125 & 145 - White 1650 Yard Boss - Moto Mower 710-100
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PostSubject: Re: 12.5 HP B&S Starting Issues.   12.5 HP B&S Starting Issues. Icon_minitimeDecember 1st 2017, 8:07 pm

AllisKidD21 wrote:
If it won't fire even on starting fluid, and you're sure it has good spark and compression, I'd think that the spark timing  was off. Maybe the flywheel key sheared off for some reason. Did you have the flywheel off at any point? If so did you torque the nut down to spec?

I agree with allis.  Look to see if the flywheel key is sheered or not.

Also, is it a flat head or OHV? You mentioned doing a valve job, if ohv maybe readjusted again, but I'm guessing flat head.


12.5 HP B&S Starting Issues. Sig115PROJECTS:
     Marshal ........93 Craftsman GT6000      
     Red Bandit ...72 Wheel Horse Raider 12
     Dirty Rat........77 Sears Suburban
     Bowser..........01 Murray Widebody LT
     Other projects
Have a question? Ask me! Type in "@MightyRaze" in your post!
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Double W Cross Ranch
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PostSubject: Re: 12.5 HP B&S Starting Issues.   12.5 HP B&S Starting Issues. Icon_minitimeDecember 1st 2017, 8:13 pm

It's a flathead. I'll check the flywheel key; I think I have an extra.
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prancstaman
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PostSubject: Re: 12.5 HP B&S Starting Issues.   12.5 HP B&S Starting Issues. Icon_minitimeDecember 1st 2017, 8:23 pm

Maybe check the oil to see if there is gas in it. Float bowl might have been leaking into cylinder and flooded it, past the piston and got into the oil.
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Double W Cross Ranch
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PostSubject: Re: 12.5 HP B&S Starting Issues.   12.5 HP B&S Starting Issues. Icon_minitimeDecember 1st 2017, 8:30 pm

I checked. Have normal amount of oil however it smells kind of like gas. What would I do to fix it or make sure that's the issue?
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PostSubject: Re: 12.5 HP B&S Starting Issues.   12.5 HP B&S Starting Issues. Icon_minitimeDecember 1st 2017, 8:44 pm

Maybe crank it over for a few seconds and then take the plug out to see if it is wet and oily.


"This'll either wake you up or put you to sleep forever!"- Red Green         "Whatever you do you should do right, even if it's something wrong." - Hank Hill
     
      - MTD Off-Road Build
      - Ford LT 110 Off-Road Build
      - Craftsman GT 6000 Off-Road Build
       - Sears LT11 Rat Rod Build *2019 Build-Off Winner!*


 Garden Tractor Collection: Allis B-110 x2, 710, 716, & 410 - Wheel Horse 655, 953 & 500 Special - Case 444 - Bolens Versamatic, G10 & 1668 Diesel Swapped - Cub 106, 124 & 1000/149 Frankentractor - Ford 120, LGT 125 & 145 - White 1650 Yard Boss - Moto Mower 710-100
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PostSubject: Re: 12.5 HP B&S Starting Issues.   12.5 HP B&S Starting Issues. Icon_minitimeDecember 1st 2017, 8:47 pm

Pull the plug to see if it is wet from gas. If the float is leaking, easy fix is a fuel cut off in the gas line from tank to to carburetor. To dry out the plug from gas on it, put a flame to it, from a propane torch, or butane torch, or a lighter, to burn gas off. Crank engine over with spark plug out, to dry out cylinder, crank for about 10 seconds. Then put back together and see if it runs. Spark plug worked before, should work again. If plug is completely dry, then this isn't the problem.
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PostSubject: Re: 12.5 HP B&S Starting Issues.   12.5 HP B&S Starting Issues. Icon_minitimeDecember 2nd 2017, 11:48 am

Plug was wet. Went and did all that stuff, and it still didn't start. I tried starting fluid again, and it didn't work. Then I noticed my choke was jammed...so unjammed it and tried it again with fluid, and it momentarily fired. Then I looked at my fuel line and noticed the fuel was off....12.5 HP B&S Starting Issues. 2429134702

I'm so embarrassed. Thanks for your help!

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RichieRichOverdrive
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PostSubject: Re: 12.5 HP B&S Starting Issues.   12.5 HP B&S Starting Issues. Icon_minitimeDecember 2nd 2017, 12:00 pm

It happens to the best of us man! lol! Sometimes even the experts overthink things and overlook the simplest stuff!
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PostSubject: Re: 12.5 HP B&S Starting Issues.   12.5 HP B&S Starting Issues. Icon_minitimeDecember 2nd 2017, 1:19 pm

Always the simplest thing. But I like it when it is.


12.5 HP B&S Starting Issues. Sig115PROJECTS:
     Marshal ........93 Craftsman GT6000      
     Red Bandit ...72 Wheel Horse Raider 12
     Dirty Rat........77 Sears Suburban
     Bowser..........01 Murray Widebody LT
     Other projects
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Double W Cross Ranch
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PostSubject: Re: 12.5 HP B&S Starting Issues.   12.5 HP B&S Starting Issues. Icon_minitimeDecember 2nd 2017, 1:20 pm

Yeah, could've been worse.
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PostSubject: Re: 12.5 HP B&S Starting Issues.   12.5 HP B&S Starting Issues. Icon_minitimeDecember 2nd 2017, 1:43 pm

Reminds me of the time I took the simplicity in the pond with the fuel shut off...once the fuel in the bowl ran out she puttered out. I’m in he middle of the pond trying to pull start the thing and then I remembered, oh yeah, fuels off. Started first pull once the fuel was on
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AllisKidD21
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PostSubject: Re: 12.5 HP B&S Starting Issues.   12.5 HP B&S Starting Issues. Icon_minitimeDecember 2nd 2017, 2:12 pm

Hahaha, stuff happens. Better to be something silly like that than a big problem.


"This'll either wake you up or put you to sleep forever!"- Red Green         "Whatever you do you should do right, even if it's something wrong." - Hank Hill
     
      - MTD Off-Road Build
      - Ford LT 110 Off-Road Build
      - Craftsman GT 6000 Off-Road Build
       - Sears LT11 Rat Rod Build *2019 Build-Off Winner!*


 Garden Tractor Collection: Allis B-110 x2, 710, 716, & 410 - Wheel Horse 655, 953 & 500 Special - Case 444 - Bolens Versamatic, G10 & 1668 Diesel Swapped - Cub 106, 124 & 1000/149 Frankentractor - Ford 120, LGT 125 & 145 - White 1650 Yard Boss - Moto Mower 710-100
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PostSubject: Re: 12.5 HP B&S Starting Issues.   12.5 HP B&S Starting Issues. Icon_minitime

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