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The engine on my Snapper went bad. The part # is 31P777 0121 B1. I called a B&S dealer and they said the new replacement was 31S977 0005 G1. All the engines i find on line are 1,000-1,400.00. One site i found has a 33S877 0019 G1 for 619.00. It says it replaces 31S977 0005 G1. Same part# that replaces my engine. Can you tell me if 33S877 0019 G1 will work. If not, why? Seems like the electrical connections are the same. Not trying to buy a new mower if possible.

Yes will fit. Rated at 19 hp. It is a Promo engine so Briggs is sell it for less than normal price.

BTW the 31S977-0005-G1 is a 17.5hp rated one.

Is the pulley and shaft the same? Or do i need to order a new pulley as well?

Also, is a promo engine something I should stay clear of?

No, they are just the ones they have a big supply of on hand usually. I have sold and install several over the years.

Will I need a different pulley? Are the shafts different lengths?

I'm seeing the 31S977-0005-G1 as having a 1"D x 5 5/32" L
Can't find anything on the 31P.

StarTech said:

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Thank you! You have been awesome help. I have talked to several live bodies that didnt give much tech info at all. You guys need a tip jar!

Ron57 said:

Thank you! You have been awesome help. I have talked to several live bodies that didnt give much tech info at all. You guys need a tip jar!

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I knew we needed a pay section on here for the real pros like ScrubCadet10, StarTech, Bertsmobile1, ILEngine and so on.

slomo

What exactly went bad on your engine? Ran with no oil? No air filter?

slomo

you putting me up there with the pro's.. drags them down to rock bottom