Stock couplers were never designed to break because once broken they can do alot more damage. They break because they were designed for a 50HP 650 and are being used on 100HP 760s.
The stock coupler are cast, and weak. I have beat the crap out of my wetjet special couplers and nothing but good. I don't use the coupler WJ used, I use stock yamaha. they are awsome, especially for free...
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