Seized piston

[choseneasy]

Some pics of a damaged motor.
  S&S 111, front piston and head. Rear not as bad but very black under piston as well.

[Don D]

S&S warranty may help. If not perhaps a KB piston can be used and bore to the next oversize.
This may take some rework as the compression height of their pistons are not the same as the S&S.

[Burnout]

Is this the motor that had the Dyna S ignition on it?

[choseneasy]

No- ultima ignition

[Admiral Akbar]

Probably from too much fuel and too much timing.

[choseneasy]

I would agree on the timing— he dialled it back to limp it home.
  Fuel- I'm not sure- he was running good mileage but did go upon elevation.
I'm still looking at a possible oiling issue.

[koko3052]

Plugged or loose piston oiler?

[choseneasy]

That was my thoughts.... maybe loose and lost some oil pressure leaking into case?
I think that and detonation were a cumulative effect.

[koko3052]

I think you know your cause. Wasn't there a thread recently about the 111 having loose oilers & I think FSG commented on them. 

[choseneasy]

Not sure if it was about a 111- thought it was on stock bikes.
I will keep posting as I tear it down.

[Don D]

Ask BVHOG, he has fixed them. This is becoming a common affair with the late 4.125" bore S&S motors, sorry to report. I have fixed them with KB pistons +.010.

[nosjunkie]

Do you have a pic of the plug? it looks like the ground strap has burnt back... Exhaust valve looks like it got lean....

[Burnout]

Detonation will spike the cylinder head temps big time

[choseneasy]

I will check into the KB pistons and PM BVHOG if he doesn't stumble on this thread.
  I'll get a pic of plug.

[Don D]

You use a 117" piston and will need to shave about .030 off. Check piston to piston in the motor. Should be OK with the shorter stroke than the 117".
I could handle the job for you turnkey and I am a KB dealer.

[choseneasy]

I will keep you in mind- thanks for the info!