Driveline Performance Yamaha Banshee Big Bore Dome - 9?, 23cc by Driveline Performance at Wheelers for the Wounded. MPN: BBD-9-23cc. Hurry! Limited time offer. Offer valid only while supplies last. This is a brand new set of our Banshee big bore domes. We design our domes slightly different than most of the other manufacturers. 1. Our domes are not under cut on the outer steps. We have seen domes that are undercut crack with higher compression engines because the material was just to thin from being under cut. 2. We know that a lot of engine builders like to run tighter squish clearances. Tighter squish clearances can cause excess heat and detonation depending on the width of the
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