Put an open primary on my FXR after I blew a loose bolt through the original. I was trying to plug the mid-shift hole in the inner primary so I could go with forward controls. I was ok for most of a summer, but it didn't like it in the end. Moral of the story, don't put a freeze plug in your primary, chains and sprockets will chew them up and spit them out.
Anyway, back to open primary, and this is just my opinion. I loved mine after I switched, mostly. 1, less hassle to change the oil in it. :-) 2, works as promised, lighter, maybe another couple HP (less rotating mass) but it will likely change all gear ratios. 3, kinda noisy but I didn't mind that. 4) Never tore my toes off but I heard it could.
Would I do it on a bagger? Almost certainly not with floorboards and feet, chaps and loose jeans right next to it.
When you come to a fork in the road, take it. -- Yogi Berra
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