Unfortunately, that kind of damage can be very expensive to repair correctly (I'm talking $1000s in many cases to have it done by a pro). If you post up a photo, it would help. The location of the damage..........does it involve compound curves, chines, the keel, etc. will add to the cost. Is it a fiberglass hull or SMC (many Kaw and Yamaha hulls are SMC), which will generally make it a more expensive repair.
Depending on the value of the ski, it is often cheaper to look for a used hull that someone is parting out, than trying to do a major repair like that.
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2008 Yamaha FX HO Cruiser
2010 Hurricane Sundeck 2100
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