When I looked and studied open primaries & clutches. I had the same questions. Everyone said use the Karata and the Baker. When I started looking hard into the big HP bikes I found a page on Harley drag bikes. Even the Nitro class 99.9% run BDL drives with lock up clutches. This told me 2 things. #1 they make a quality product, #2 this product has no problem handling HP! Like others have said. The bearings break, ect. ect. If the BDL can handle 400-600HP it can damn sure stand up to my little 108hp V twin!