So it's 20* btdc?
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So it's 20* btdc?
You should check the timing pointer with a piston stop first
Oh so still can't get it over 3900?
Was motor High enough that it didn't have full load at the prop? If it's electrical or fuel.!?!
If you haven't replaced the plug wires. Those are solid core wires? I'd thoroughly check everyone end to end for continuity while gently twisting them. Better still pull the boots off each end, cut a 1/4" or more off each end and set the clip in new wire if it's still good and not burned or corroded, if you have enough slack to still make the distance, coil to plug.
Oh you replaced plugs not wires too?
Have not changed plug wires.
Did you pull the airbox and check all 6 carbs open?