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crf 50 wont start

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I bought a used 05 crf 50 for my kids not running took it apart to find a bid bore piston with rings stuck, cleaned it all up assembled it & it wont run ,has good spark , fuel to the plug, my question is timing even with a big bore not knowing if it has acrank kit or what head it si what abot timing do I set it on the stock position?? & when installing the head do you start with the cam lobes away from you towards the cyl or towards you to get the timing so that you are not 180 out

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