- Location
- North Riverside, Illinois
Same thing happened to me 2 weeks ago. 865, xs box, msd. Only seems to backfire in the water. Had a recent needle and seat issue where fuel was dumping into mag side carb. Scotty could be onto something with tank vent. I think its fuel related personally. Xs takes the filters out of the fuel pumps not that it matters but debris could be an issue...Good luck and thanks for posting.