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Ive got a 1990 KX250 that im restoring and i need some help. The jug has been resleeved and is ready to go. My ? is are both of the exhaust valves supposed to be open at the same time? I went to put the exhaust valves back in and the punch marks are not visible on the valves to line them up for timing. I think i can still time it without the matrks, dont u think? im thinking both are open together on a 2 stroker. thanks keith
 
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