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Originally Posted by jonathan180iq
Ps: In that photo notice the position of the lobes on the valves and the position of the valve heads themselves inside the chamber...
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The single cam on the 250 does not act directly on the valves. It pushes 2 rocker arms, one intake and one exhaust, up and each rocker arm pushes its 2 valves down.
+1 on Water Warrior's comment. One, ore maybe even 2 teeth out and it might still run, but not well. Any more than that and you risk hitting a valve with the piston and putting yourself back to square one...