Fouled spark plugs

[Edwinh1234]

Hey guys. I took my ski out the other day & fouled my plugs after about an hour and a half of riding. Keep in mind this jet ski has a new rebuilt engine & brand new mikuni carb so I’m assuming I have it running rich. What should I adjust on the carb to help that?

 

[mikidymac]

Did you check the carb jetting to make sure the jets and screws are the same as your ski requires?

Did you adjust the oil injection pump?