2004 SR Johnson 2-stroke 40, 50HP Service Manual, Page 133Get this manual
IGNITION TIMER BASE
Installation
Inspect bushing in the timer base and inspect powerhead timer base bossBoth surfaces must be free of dirt, metal chipsand scratchesAlign adapter with threaded holes in powerheadSlotted area of adapter must face starboard side
Install retainer in timer base groove with retainer tabs positioned to right of leverSqueeze tabs and insert timer base into adapter1Retainer tabs
Position the three retainer clips on adapter