Hi i have a question aboute ignition and copression on a Tohatsu 50d2 i have shaved the head and I have 170psi what should I do with the timing? more,less the same? and can you run normal pump gass on 170psi.. and what jets should i run original 132 or 125? Do you need larger jets with higher compression? the reson I wonder is I'm running 125 jets and advanced timing but i cant get the revs up. i't feels like the engine is running slower now than before i shaved the head????

As you can see i'm kinda green in this area

Thanks...