motor.How much?

 

For 50+ years the gold standard for flywheel runout was .002 or less. If runout exceeded .005 cases had to be split and flywheels retrued.
From 1999-2006 the runout limit for twin cams was .005
In 2007 Harley changed the runout limit to .010 (H-D said spec also now applied to 99-06)
In 2009 Harley changed the limit again to .013 (H-D said retroactive to 99-08 models)

Harley's manipulation of the twin cams runout specs was likely their attempt to avoid liability when a small but significant number of twin cams were reported to have flywheels that shifted out of true. The flywheel issue seemed to be mainly limited to 2007 TC-96 engines and Harley reportedly made some changes (new crankshaft bearing in 09). To be fair, I haven't heard on this forum or locally of a single case of shifted flywheels on 08 or 09 model twin cams. If you're going to do gear drive cams flywheel runout has to be .003 or less (according to Andrews, S&S). If you're doing a build that includes splitting the cases, Dark Horse or Revolution Performance can true and tig weld the flywheels to less then .001.

 

Anything over .0035 would make me nervous (waiting for it to get worse).

Had an 04 that went to .009, started to ride hotter and work harder (lost mileage).
Didn't ride as smooth.
Harley's new spec would have called it okay. I considered it junk.

 

.005 is what we found on my 05.S+S gear drive has been in about 30k now. Motor started making noise last week.Exactly what my wrench told me.Time for some bigger wheels I guess,only question which one.Thanks for the response crush

 

Half a thou to one thou. in my world. All cranks leave our shop at a half...... Dynamic.... balance......

Harley should get this when they let there cranks leave the shop

 

I'm almost afraid to have mine checked. From what I've read .003 to .005 seems to be the norm for TC-96 engines. Anything other .002 adds vibration and increases parts wear so hopefully I'm one of the lucky ones that has only .003. I plan to get a bolt-in cam done in the near future and I'm going to have runout checked then. If you're going to split the cases might as well do the timkin bearing conversion. Harley really screwed up when they stopped using the timkin bearing on the power side of the engine in 2003. Saved them money but it along with a pressed together flywheel assembly made the twin cams bottom end weaker then the engines that came before it.

 

Harley also uses regular freeze plugs to seal the crank pin for oil flow. I know rev-perf takes those out and presses an actual plug in place then welds it. The plug helps strengthen the crank pin it also helps with holding the flywheel in place. The press fit can loosen up over time aiding in run out issues. Many other companies due this service with there true and tig procedure.

 

mine in running like ****. My indy says its .008 out of true but with the HD specs its fine. WOW