Jetting for Merc 25XS

[raceboat61-S]

Gents,
I need some help. I plan to "unrestrict" my 25XS for this years racing and run it in 25SSR and the 25MH, BMR, BMH classes. What jets should I install? Will I fry a piston by running too lean a mixture if I pull the restrictor and leave the old jets installed? Does Mercury still carry the needed jets? I heard that the carburetor is now longer an item in stock and there is a "replacement' carb of 'similar' performance? Thanks, Mike Marshall, raceboat61-S

[Jack Stotts]

Mike, I ran my 25XS in AOF where the restrictor plate was not required in either hydro or runabout and ran 92,94 and 96 jets. The 96 was a bit rich. I used to have the part numbers for the jets but that data went with the engine when I sold it two years ago. I think the jets are somewhat common within Mercury carbs. and should be available. Jack

[Doug4N]

The new replacement carb has the same dimensions as the XS carb. It appears to be different only in the idle circuit, idles better, not a quality we really care about. The throttle shaft does not have a ball stud either, easy to adapt. Jets are all available listed below
1395-6206 .088
1395-6247 .090
1395-5733 .092
1395-8423 .094
1395-6249 .096

Doug4N