Mercury Optimax 200/225 from year 2000 Service Manual., Page 7Get this manual
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SPECIFICATIONS
1.0 1.8 1.8 0.1 1.3 0.3 72.4 3.4 kPa (10.5 0.5 psi)
The fuelair differential must remain at 72.4 kPa (10.5 psi)If this differential is not maintained, the engi