120 is enough if ever curious go to the chain calculator in the tech section on the main page type in 104 for number of links on stock then type in what your swinger is and it will tell you but always get a few extra links to allow for size depending on sprockets
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You should really think twice about giving any advise a modded tranny or end cut trans is worth it on any motor and if one or two hundred is going to break the bank you are owning the wrong bike
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If you check my winter build thread I have some more pictures also.
http://www.bansheehq.com/forums/index.php?/topic/161143-Winter-Drag-Bike-Project..
Winter Drag Bike Project..
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some say your dont need them till ya go real big. i got them with my ss motor. If ya can afford them, there not gonna hurt anything having them, and as said do help relieve side load on the crank.