Mercury Optimax 200/225 from year 2000 Service Manual., Page 593Get this manual
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POWER TRIMDESIGN II
6 Reinstall fill plug7 Run trim up8 Disengage tilt lock lever9 Open valve (f) and close valve (g)10 Run trim downMinimum pressure should be 4140 kPa( 600 psi)11 Tilt o