My husband spoke to a fella this weekend that said he had a Big Bore kit put on his C50 that boosted it from an 800cc to an 1100cc.  We have not been able to locate anything and the dealer where we bought the bike had not heard of it.  Can anyone out there give us any guidance?  

Your Suzuki dealer has it in stock.  It's called a C90.  Just kidding (and yes, I know the C90 is actually about 1500 cc).  But seriously, I have a C50 myself and I cannot conceive why you would want to make such a change.  If you could get this change done for much less than the additional cost of the C90, I would be surprised, and apt to give you lots of trouble (unless you own a motorcycle dealership).  My C50 is plenty fast even with two aboard, as long as you open the throttle.  If you really want fast, buy a sportbike.  

We are not looking for "speed"!  We were curious about the cost to boost the engine.  We love our bike but would like to be able to pull a trailer (for extra storage).  It is not recommended that a trailer be pulled with an 800cc bike.