I'm new to gas 4 strokes...but have a question: if the valve timing is wrong even by one teeth,the engine still is capable of about 7100 rpm on 18x8 prop? I tried to move the timing dot(now pointing down 6 o'clock) ,one teeth towart the prop,as suggested on this forum...and had half the compression travel(means the valve open until the piston were halfway between TDC and Down dead centre...) so don't tried at all to start it.