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  #11  
Old 6 Days Ago
Ferrous Head's Avatar
Ferrous Head Ferrous Head is offline
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Sportster/Buell Model: XLB, XLCH, Sporton
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Sportster/Buell Model #2: XLCH
Sportster/Buell Year #2: 1966
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The balance factor is always a compromise. You can't balance for the entire rev range - only 1 rpm. Say like 5800 RPM.

So sometimes it depends a lot on how you ride your bike.

On a race bike where you are WOT all the time you'll balance for higher RPM's.
For puttering around town you really want it smooth lower down.

triumph changes their balance factor 4 or 5 times back in the 60's trying to reach a sweet spot that everyone liked.

Never did.

You don't really need forged psitons in there buy if you have them already you might as well use them.

With clearances reputable piston manufacturers will tell you what to use, If you don't have that figure I would be more likely to go to 10 thou.

But that's just my opinion.
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