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i was also looking at this. if you assemble the camshaft like on the drawing, it makes no sence. camshaft 1 opens the intake before the exaust. that is the wrong way around. before i take the cilinderhead apart again, i would also like to no if it is possible to get the timing right? i would like to use a few copy's of this model in my lessons for basic instruction, but than it has to be right. But what an awsome project. Fantastic