R&D has completely revised the engine coupler/dampener system to an updated design proven to work reliably with up to 400 H.P. R&D started off with the KAWASAKI Ultra 310X dampener, and worked from there re-designing the lug profile to offer a precision fit to the dampener. The R&D billet aluminum design allows perfect engine to driveshaft coupler alignment, and delivers maximum strength and balance for high horsepower Kawasaki four stroke engines. Kit comes complete with Kawasaki Dampener. NOTE: The Kawasaki Dampener handles 310 H.P. for years with zero wear and tear which made it a first choice for dampers. Pt. # 611-01500 w/out dampener Pt. # 611-01501 complete with Ultra dampener Pt. # 611-01510 SX=R driveline Support
