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Author Topic: 10/12.5 briggs flat head  (Read 7730 times)

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Offline crazycraftsman

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10/12.5 briggs flat head
« on: September 28, 2011, 03:11:09 pm »
does a 12.5 have a larger pistion than a 10 hp..trying to find what i got? no shroud on engine ..can you tell by the carb numbers or any thing else visibley.. carb number is 4993 walbro. also scibed 2220 / 497119 and  61..any help would be appricated..thanks..fly wheel larger,smaller???
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Offline Jim Knutson

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Re: 10/12.5 briggs flat head
« Reply #1 on: September 28, 2011, 03:47:54 pm »
Bore for 10-11-12&12.5 hp or model #s 22-25&28 cid engines = 3.44" , stroke different on all models.
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Offline crazycraftsman

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Re: 10/12.5 briggs flat head
« Reply #2 on: September 28, 2011, 04:01:37 pm »
so rod is different lenth on each model..are all the sumps same ..is that the only way to tell the differance from each engine..with out shroud..thanks
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Offline redline

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Re: 10/12.5 briggs flat head
« Reply #3 on: September 28, 2011, 04:08:40 pm »
I believe there is one more bolt on a 28 vs a 25 pan, but I could be wrong.
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Offline Jim Knutson

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Re: 10/12.5 briggs flat head
« Reply #4 on: September 28, 2011, 04:12:24 pm »
Best way to find out is pull head and measure stroke, 22"=2.38"     25"=2.62"       28"=3.06". with those differences in stroke, you should be able to find which it is you have with a simple tape measure. and i believe the sump is the same on all those models, someone back me up, or correct me.
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Offline BIG AL 202

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Re: 10/12.5 briggs flat head
« Reply #5 on: September 28, 2011, 05:00:42 pm »
Quote from: redline on September 28, 2011, 04:08:40 pm
I believe there is one more bolt on a 28 vs a 25 pan, but I could be wrong.
2 more bolts.
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Offline Jim Knutson

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Re: 10/12.5 briggs flat head
« Reply #6 on: September 28, 2011, 05:49:34 pm »
My bad on the sump/pan info...thanks for correcting me guys.
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Offline crazycraftsman

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Re: 10/12.5 briggs flat head
« Reply #7 on: September 28, 2011, 07:01:37 pm »
thanks.ill count. 12.5 10 bolts and ill measure the stroke ..thanks for the info...
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Offline crazycraftsman

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Re: 10/12.5 briggs flat head
« Reply #8 on: September 29, 2011, 12:34:40 am »
so i have a 11hp flathead and it has 6 bolts into sump i have a 12.5 flathead and it has 10 s0 im guessing a10hp flathead has 8???bolts going to check out 4 engines this weekend..3 of them have no tins..thanks for any info..trying to avoid pulling of 3 heads..
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Offline crazycraftsman

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Re: 10/12.5 briggs flat head
« Reply #9 on: September 29, 2011, 06:49:52 pm »
guess no one knows?? sumps may have more or less bolts depending on early and late model flatheads???thanks for any info.
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Offline BIG AL 202

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Re: 10/12.5 briggs flat head
« Reply #10 on: September 29, 2011, 09:15:16 pm »
Alright I admit I went off memory and not checking. The 28 has 10 bolts and the 25 HAS 6 ! I was wrong, OOPS MY BAD SORRY GUYS. :oops:
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Re: 10/12.5 briggs flat head
« Reply #11 on: September 30, 2011, 11:56:55 am »
Quote from: BIG AL 202 on September 29, 2011, 09:15:16 pm
Alright I admit I went off memory and not checking. The 28 has 10 bolts and the 25 HAS 6 ! I was wrong, OOPS MY BAD SORRY GUYS. :oops:
For that you shall be shunned for one hour...
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Offline BIG AL 202

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Re: 10/12.5 briggs flat head
« Reply #12 on: September 30, 2011, 02:39:34 pm »
Can I come back now, please, I'll be good!
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Offline westonedelbrock

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Re: 10/12.5 briggs flat head
« Reply #13 on: October 05, 2011, 11:15:33 pm »
is the head even smaller on a model 22 than a model 25? would it fit on a model 28?
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Offline 2nstoys

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Re: 10/12.5 briggs flat head
« Reply #14 on: October 06, 2011, 01:57:44 pm »
The 10 hp head is actually in between the 25 and 28. Combustion chamber is not as small as the 11 hp but smaller than the 12 hp+.  It is a good one to bolt on and run if you can with your rules.
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