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Have to settle a bet here and the searchs havent helped so here goes....

When installing a new set of pistions in the twin cam one side says that you only have to make sure that the pistons are match weighted to themselves..
IE. 550g each..
the other side says that they have to match the original piston weight that was removed from the bike...
 

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ktwillys said:
Have to settle a bet here and the searchs havent helped so here goes....

When installing a new set of pistions in the twin cam one side says that you only have to make sure that the pistons are match weighted to themselves..
IE. 550g each..
the other side says that they have to match the original piston weight that was removed from the bike...
There is no correct answer, but matching the weight of the heavier pistons to each other is the more slightly correct answer. (You would do this anyway!) Why...because balance factor is always a compromise and the heavier pistons would only lower it to something closer to 50% than it was before. Doubt you would even notice...

I believe the rubber mounted motors have a slighly lower factor that results in more vertical movement into the mounts and the rigid mounted motor has a little higher one to put more into the horizontal (less vibe perception). Almost a mute exercise thought due to the inherent rocking motion of the V-Twin.

:cheers:
 
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