Author Topic: 28 vs 31 blocks  (Read 548 times)

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Offline silveradoboy

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28 vs 31 blocks
« on: April 20, 2017, 10:53:57 AM »
i have a 31a607-0741-b2 15.5hp ohv briggs engine and im trying to find a walbro lmt carb to put on it but cant figure out if one from a 28 block would fit. i dont care about the solenoid on the bottom of the carb because i plan to wire it out anyway, im trying to get away from the stupid nikki that is on the engine.

would a 698171 carb from ec fit? everytime i look at their site i shows it being a 28 block carb and not the 31 block.

and what is the biggest difference between the 2 blocks besides one being older than the other? will engine covers fit and internals be the same?

silveradoboy



Offline EUBANK RACING

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Re: 28 vs 31 blocks
« Reply #1 on: April 20, 2017, 01:02:20 PM »
Basically to keep it simple, everything is the same except the bore, no difference in carbs
\"Micah\"

Offline silveradoboy

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Re: 28 vs 31 blocks
« Reply #2 on: April 20, 2017, 04:12:09 PM »
Thanks, I appreciate the help

silveradoboy


Offline BIG AL 202

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Re: 28 vs 31 blocks
« Reply #3 on: April 21, 2017, 10:45:28 AM »
AS LONG AS ITS NOT AVS!
ALWAYS VOTE FOR ED!   FONGS BROTHER FROM ANOTHER MOTHER!

Offline silveradoboy

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Re: 28 vs 31 blocks
« Reply #4 on: April 21, 2017, 06:20:16 PM »
What does the difference of avs mean? I have the avs block does that make a difference?

silveradoboy

Offline nip 19

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Re: 28 vs 31 blocks
« Reply #5 on: April 21, 2017, 08:54:55 PM »
Avs motors run different  size cranks and balancers  than non avs. Typically they won't take the beating in a stock form that a non avs will but both motors can be built to run strong with the right parts.   Do a search . Tons of info on here about those motors.
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2011 SRUSAAO FX champion.   Kevin

Offline silveradoboy

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Re: 28 vs 31 blocks
« Reply #6 on: April 22, 2017, 06:26:24 AM »
I always wondered about the difference. Thanks to help guys ill do some searching later.

Do y'all know if people cut and modify the engine cover to run a velocity stack and pod filter or do they run a 28 block cover?

silveradoboy


Offline Mickey mower makin

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Re: 28 vs 31 blocks
« Reply #7 on: June 14, 2017, 02:00:11 AM »
Basically to keep it simple, everything is the same except the bore, no difference in carbs
[/queote] in that case will a flywheel for a 31 or 28 interchange with each other?