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Sportster Motorcycle Motor - Top End Discuss Sportster Motorcycle Top End issues. Rockerboxes, Valves, Cylinders, Pistons, Rings, Lift Rods, etc...

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  #1  
Old 2nd March 2021
MadMaxUK MadMaxUK is offline
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Default Pre 04 pistons in later motor?

Just looking at the Wiseco K1661 flat tops but they're listed for 88-03 motors only. Any reason why they couldn't be used in a 2006 1200 motor? Are they longer skirts - clearance issues with the cooling jets?
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Old 2nd March 2021
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Exactly, on both accounts.
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Old 2nd March 2021
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Quote:
Originally Posted by sportsterpaul View Post
Exactly, on both accounts.



DITTO.



the 04 and up use a completely different bottom end.. so those parts aren't as interchangeable as the upper end stuff. some exceptions..



however, the piston squirters are 04+
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Old 3rd March 2021
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Just off the phone to Wiseco. Their tech said that the skirt length is 1.979" on the 88-03 pistons and 1.967" on the 04 onwards. Might be a case of just popping them on the milling machine and taking off 0.020" ...
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Old 3rd March 2021
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Quote:
Originally Posted by MadMaxUK View Post
Just off the phone to Wiseco. Their tech said that the skirt length is 1.979" on the 88-03 pistons and 1.967" on the 04 onwards. Might be a case of just popping them on the milling machine and taking off 0.020" ...

Why don't you just buy the correct pistons? You haven't spent any money yet.

John
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Old 6th March 2021
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Quote:
Originally Posted by John Harper View Post
Why don't you just buy the correct pistons?
I can source Wiseco, SE or KB pistons easily but neither Wiseco nor SE do a flat top for 04 onwards and I refuse to use KB.
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