How are the stock unmodified Twin Cam bottom ends holding up to 10.5:1 compression and 107 C.I. I have a 2013 FLH.
Billy

 

......all depends how you ride. If you like to get the full potential out of the motor and ride hard then I would do it and I did.

I just rather take some extra precautions and not have to worry about grenading the bottom end. Bottom end can go on a stock motor...again it's all about how you ride it.

Before I sent my lower end to Dark Horse my stock 96" crank was at .007"

 

there are alot of 107's running around on the stock bottom ends without have any issues. with 555 to 585 lift cams and stage II head work , and your not dumping the clutch on a high revving engine you will be fine.

 

That's true for sure. Even after you get moving and you hit it wide open all that power is being transferred throughout. Not saying you baby or beat the **** out of you bike, but when you have power you gonna ride te F$@k out of that scoot.

We take a risk every time we get on the throttle, so any way to minimize that is a plus.

My luck it would be in pieces w/o a doubt.

 

I won't be drag racing or doing burnouts too much. I just miss the power my old bike had and want to get more torque out of this one but keep it reliable. I go on trips and don't want a major break down in the middle of no where. Being that the crank is the weak link I don't want to push it too close to point of failure. I'm not too far from Starracing.
Billy

 

HQs 107 on 09 RG - stock bottom end - 43k miles burnouts / wheelies and general mayhem -- no problems -- this is my second 107 -- if you do the bottom end go 113 or better -- or look into crate motor from S&S not much difference in price and you get a warranty

 

Traditionally, and historically, the 2004, and 2007 model years were the ones that were prone to sissoring.
As Todd and others already pointed out, if you get the tire warm, and drop the clutch drag-racing style, repeatedly, you can harm most anything.
Ride it, have fun and don't worry.
Scott

 

If you have not done your build yet, check your crank run-out first. IMHO if it is over .006" then fix the crank before doing the build. I know one guy that did a build at .007", and now he is having to do the build all over again.

 

Looks like a gamble not doing anything to the crank while up grading the motor.
Billy

 

I suggest you pay attention to post #7 first, then #6! There are hundreds of thousands of these things around the World and they are not all stuck on the roadside with knackered crankshafts.......