just got to rebuild my aq125a volvopenta 1988 , when i try to go fast, i can go no more than 9knots per hour, or same as 3000 rpm and start backfiring. when i just get the engine from machine shop. i have hard time to stared so i move the distriburetor so i move a little bit. but the engine time suposed to be at 10". if we put at ten it will no star or i star it will shake much, so we put the time on zero an stared right away but right now we can go no more than ten knots, because star backfiring can someone help me on this please? thankyou
