Mecr SportJet 90high speed rpm problem

[boatnut]

"Hi !
This 1994 motor will c

"Hi !
This 1994 motor will change rpm by itsself at higher rpms.
I put a new high speed stator in it and it still does it.It has a new flywheel, too.
Any ideas ?
It is essentially the same motor as a 90hp outboard.

Thanks"