Many thanks to DarkHorse Crank Works. Good people to deal with.
Special thanks to Redline. The best motorcycle repair shop in Pensacola.

 

the s&s 106 kit uses stock stroke. its just cylinders and fitted pistons.

 

absoluty knocking is usually piston slap or knocking usually from the pistons being too small for the bore or the ring tension not being enuff causing the piston to rock in the bore which will also create more harmonic vibration.
you see now we are chasing down the problems for the vibration itseems to be a lot of small issues creating one big one.
i would not say the shop is guilty for these problems but they are guilty for not checking the tolorences of the parts they installed there forthth it makes them liable for the fix once they installed the parts.
if a shop buys parts that are defective then sells them to some one it makes the shop liable not the mfg who originally sold them. the customer paid the shop not the mfg it is the shops responsibility to check and double check things out. now if the shop does their own boring and head work and sells to customers then they are responsible for their product.

 

Many thanks to DarkHorse Crank Works. Good people to deal with.
Special thanks to Redline. The best motorcycle repair shop in Pensacola.

 

Many thanks to DarkHorse Crank Works. Good people to deal with.
Special thanks to Redline. The best motorcycle repair shop in Pensacola.

 

Many thanks to DarkHorse Crank Works. Good people to deal with.
Special thanks to Redline. The best motorcycle repair shop in Pensacola.

 

Can you READ "S&S 91-7088-S" on the bottom of your cylinders on the lelt side of the bike right near where the shift rod goes back? Right above the silver parts of the cylinders?

If not, then you do NOT have an S&S 106 BB kit for 07 and up.. The S&S kit comes complete with cylinders. There is NO "kit" that is pistons only, even though one CAN buy the pistons from S&S.

If it does NOT say this on your cylinders, then all advice and bets are off, because who knows what pistons are REALLY in there.

If it DOES say the S&S on the cylinders, then at worse, they (Heath and Don) didn't measure and you could get a bit of piston slap, but NOTHING from the S&S kit (in and of itself) would make an out of balance condition.

You DID send the crank BACK to Darkhorse, right? WITH the pistons, Right?

Here's the thing... YOU do NOT post ANY pictures of ANYTHING, and by now... I really wonder about all of this even being true. How else could one even dream up a piston changes the stroke of an engine? You 'claim' the whole engine was tore down AGAIN, where are the pics of the process? Where is the pic of the crank you took out? From a pic, one could tell you right away if it was balanced or not (balancing is NOT truing, it is an added cost item from R&R and Darkhorse). Actually, I do NOT think you can get H-Beam rods without a balance anyways. You cannot do that with R&R.

Also, there actually IS 'tuning' for cranks. It is called the 'Balance Factor" Stock TC cranks are like 52 balance factor,I think. They go up to 60 BF.

But.... the BF won't change vibration at low RPM like 2500. BF is altered to make assembly act better at HIGH rpms.

Here is a pic of MY crank which had the BF changed AND was balanced.









**** ALERT......... **** ALERT..................... **** ALERT................. **** ALERT..................











See the holes and the drill marks in the flywheels? Did YOU crank have ANYTHING similar? Even just where it looked like someone took a drill and drilled partial holes? THOSE are balancing marks. This is NOT a Darkhorse crank, but a crank is a crank is a crank... the holes in mine were part of the BF adjustment, but the drilled things ARE from balancing. This crank was balanced, trued, plugged and welded, with H-Beam rods installed. It is an "A" motor 07 up crank EXACTLY like yours.... should be (minus the big a$$ holes).

And... YOU had rods that looked like these, right?

And... yes, this can easily stand up to anything you could throw at it, just like a crank from John can. I can NOT, in my wildest dreams imagine TWO cranks from DH coming in bad to the same builder. I am TIRED of you with repeating it MUST be DH, when it is NOT..... ABSOLUTELY NOT TWO IN A ROW. It IS a combination of YOU, not doing ANY homework before the 'build', and then your 'ace' mechanic afterwords screwing up some DH cranks. You can NOT let yourself off of the hook completely. Even a 'novice' should understand a little about an engine's build and what is going into it. If it wasn't explained well enough... YOU should have asked.

Due Diligence...

I'm starting to sense the ocean breeze around this thread... Slap Daddy might have had it 'down'.

 

john you are a little mistaken about your flywheels ,"the balance factor adjustment" and balance factor . those large holes in your crank are from the lightening of the crank that r&r does , and the drilling is from the balanceing procedure. the balance factor is a percentage number any where from 52 to 62 used in the formula to figure out the bobweight used in the procedure. the balance factor used ,depending on what percent will move the sweet spot in the rpm range. 62 being more for drag motors. hope this helps

 

Many thanks to DarkHorse Crank Works. Good people to deal with.
Special thanks to Redline. The best motorcycle repair shop in Pensacola.

 

Many thanks to DarkHorse Crank Works. Good people to deal with.
Special thanks to Redline. The best motorcycle repair shop in Pensacola.