Board index Flathead Power-Technical Questions, Answers, and Suggestions Evo's Thru 99 S&S 113 Engine

S&S 113 Engine

Post Sun Mar 21, 2021 9:41 am

Posts: 50
Location: Santa Fe,NM
A good friend recently passed and I have a chance to buy his 113 inch S&S Evo engine. He bought it at the Denver swap meet some years ago but never ran it. Its supposed to be new and never ran. I called S&S and the engine number indicates it went out the door in 2000, is a 4 and a half inch stroke by 4 inch bore. It seems this engine was discontinued not long after and replaced by the 111 inch engine. I asked around and local mechanics say this under square engine is known to vibrate and have a short life.
Does anybody have any experience with this engine? Thanx in advance

Post Sun Mar 21, 2021 1:17 pm

Posts: 3553
Location: Central Illinois, USA
I'm clueless about late models and S&S motors, Pablo!

But I do know that virtually all classic production Harley designs were under-square. A lot.

"..vibrate and have a short life" suggests a balancing issue, as if anyone really has such extensive experience wearing out S&S motors?

Your locals don't have an option on it, do they?


Post Sun Mar 21, 2021 2:41 pm

Posts: 50
Location: Santa Fe,NM
Nope, aren't interested
kinda wonderin why S&S went to the 111 which I think iz 4 and a quarter by 4 and a quarter and dropped the 113

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