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Old Sep 21, 2025 | 06:04 PM
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@daven9113 What year are those crankcases?
 
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Old Sep 21, 2025 | 08:12 PM
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Thanks for all your inputs? Haha…… Shrapnel all in the bottom end. Case, cylinders, heads, oil pump, and many other parts are salvageable. Crank probably rebuilt or replaced when the time comes.

Drinking tea from a KB pistons so difficult! 😂😂



 
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Old Sep 21, 2025 | 08:16 PM
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KB pistons AKA KaBoom Pistons
 
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Old Sep 21, 2025 | 08:16 PM
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Originally Posted by Dan89FLSTC
@daven9113 What year are those crankcases?
1998. Very decent shape on the outside. Will see the inside once case is split.
 
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Old Sep 21, 2025 | 08:22 PM
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Originally Posted by Dan89FLSTC
KB pistons AKA KaBoom Pistons
I hear about the warnings on this site for many years, but never had experience with them. Maybe the person who set it up did not set the correct ring gap. I haven't really investigated, but the broken piston did have a broken oil ring. I will have to relook at it closer. They were KB standard size pistons.
 
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Old Sep 22, 2025 | 08:19 AM
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That should keep you busy this winter.
 
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Old Sep 22, 2025 | 09:17 AM
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Originally Posted by daven9113
Thanks for all your inputs? Haha…… Shrapnel all in the bottom end. Case, cylinders, heads, oil pump, and many other parts are salvageable. Crank probably rebuilt or replaced when the time comes.

Drinking tea from a KB pistons so difficult! 😂😂

oh wow what you have there is the KB Blower piston, no not a supercharger, just rev’er up and watch it blow
 
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Old Sep 22, 2025 | 10:00 AM
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[QUOTE=daven9113;22121068 Crank probably rebuilt or replaced when the time comes.


 
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^^^ I had a shop install the shovelhead version on my 82 FXR. They measured it out and were impressed.
 
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Old Sep 22, 2025 | 04:37 PM
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Originally Posted by Dan89FLSTC
KB pistons AKA KaBoom Pistons
The UEM (United Engine & Machine) KB forged 4032 are some real good pistons.
Anything hypereutectic are the problem child.
 

Last edited by Schex; Sep 22, 2025 at 04:40 PM.
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