question about engines (merury)

[c.rodriguez]

I have two engines 90 3 cylinder series 0b228289 are those are good for racing or a need advantage before start put some job

[Markus]

Depends on how you define good, but at least over here, those engines were not used in any racing class.

The 90 hp Yamahas and Tohatsus were.

[Wayne Cammidge]

The Mercury does not comply with the 1.3L regulations as it is almost 1.4L
So not raced in the offshore classes.
The 3 and 4 cylinder Merc's do not stand up to high RPM's, so if you rev them above their approved max RPM's they are going to throw a conrod.
Also with the single piece powerhead you are not able to take off the cylinder head to do any modifications.
Exhaust chest could be cleaned up a bit if you want, but no real benefit to changing ports heights as you can not spin it any faster.