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Start to look trough the parts and found this head.
It is clearly changed as it has 4mm stem valves that is not original Motom.
But it might be interesting to find out where those valves original were mounted in.....
Seen from top.
seen from bottom.
4mm stem 55mm long
Intake 18,3mm
Exhaust 25,2mm
Perhaps homemade spring tops.
Valve lock/key
Strange flow of the intake cannel.
Top off the valve guides.
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