Just available from S&S Cycle, these proven performance kits don’t need any machining, any rebalancing. Just bolt on in pistons and cylinders (4” bore, 4 3/8” stroke) in place of the stock ones. Installation can be done with engine still in the bike!
Kit works well with stock cylinder heads, or let S&S CNC port those heads for even more power. The factory 1999-2006 Twin Cam engines will roll up to 100” and the 2007-later models (except 2017 touring models) will become 110” monsters.
The 10.5:1 compression makes for a very street able and dependable engine that also responds well to performance cams. S&S 4” bore kits are available in color matched silver or wrinkle-black powder coat finish. See your local S&S Dealer or go to S&S Bolt-On 4” Bore Kits.
On this and the winter kit there is not sufficient material for fitting oversize pistons for rebuild. This is not a criticism but for information only.
Good luck.
Why would you be concerned with a re-bore on a brand new set of Cylinders and Pistons, that would be a concern way way way down the road and even then just buy another set at that point.
Not a criticism, just an observation….
Steve Carr
anytime you can bolt on cubic inches it’s a win..and these guys get it right every time..
Steve, I’m not concerned. I called S&S about this and was told that due to the thin liner (and yes I know it is plated..that was part of my question) oversize pistons could not be used. I wanted to know. I’m simply sharing information. Rebuilding an engine seems to be outdated.
Thank you so much for taking your valuable time to provide me with your sarcastic remark.
Good one Sam. Right on. Merry Christmas mostly everybody.
No sarcasm, just an observation.
The size of the bore and the stock case diameter simply dictates there is no more room for oversized pistons or they would have gone even bigger for even more ci.
Steve Carr
Sam and Steve: Behave yourselves boys or you both go to your rooms without supper!
First: Merry Christmas Red Dog. Secondly, I appreciate what you are saying Geezer. I understand that Steve Carr is a true gem of motorcycle knowledge, so rather than air this out here, I’ll just iron out this little wrinkle with Steve personally. Sorry I took the bait. I’m a fan of S&S. I stupidly rejoined this elite group and obviously do not belong. I do not like bullies and I detest know it alls.
Sam, I found your original remark informative and useful. Thanks for sharing.
Sarcasm, just one more service we offer! they’re nice pistons made by CP, you could shave in the dome finish