Changing ignition systems???

[jerryjerry05]

Working on a 1994 25hp Mercury.
Somewhere along the line I got some info that there might be an ignition change from the old

SWITCHBOX ASSEMBLY *{(Jet 20)}* 18495A30

To
SWITCHBOX ASSEMBLY *{(20/25) SN# USA-0G438000/BEL-9927000 Up}*
7452A19
Two different packs and I guess the trigger/stator is different too??

ANY!!!! insight /info would be appreciated.
Thanks.

 

[hardwater fisherman]

Working on a 1994 25hp Mercury.
Somewhere along the line I got some info that there might be an ignition change from the old

SWITCHBOX ASSEMBLY *{(Jet 20)}* 18495A30

To
SWITCHBOX ASSEMBLY *{(20/25) SN# USA-0G438000/BEL-9927000 Up}*
7452A19
Two different packs and I guess the trigger/stator is different too??

ANY!!!! insight /info would be appreciated.
Thanks.

I have what some people call a 1994 and a 1/2 model 20 hp. On mine the trigger is fixed and the timing curve is built into the switch box.. I believe that the 1994 and before has a link from the carb to rotate the trigger to advance timming.

 

[jerryjerry05]

Mine has the fixed trigger.
Looking for a service bulletin or something/someone to explain the change???
Thanks

 

[hardwater fisherman]

Sounds like you have the same as mine. If so the timing curve is in the expensive switch box. [ 415$ ] . It appears to have a different stator but the trigger is used on both models. CDI lists the newer ignition as 1994-1997.