Just wanted to give some info. On the 14' spark vs. The 15' since I've own both. Both skis are 2 up h.o. 2015 model year and 2014..... anyways. Does not seem like much has changed at all. The only thing I see is the addition of the flush kit and the engine access cover has a latch on it now. (I can up load a picture of this if everyone has not seen it yet). The other thing I have noticed is the the 15' does not have any water in the engine compartment after I'm done riding. The 14' always seems the have about a cup or two of water drain out of it at the end of the day. The 2015 does seem to use less fuel, I assume this is only because it has far less hours on it than the 14'. I don't think sea-doo touched the engine? There was much speculation the doo would increase the price for 2015.... that did not happin.