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XR650L Cam chain questions

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My engine wasn't starting, which led me to very little compression, which led me to a new piston, rings, rebore. I am having trouble with the timeing. I rotate the timing but to tdc, I set the cam shaft in it's position with all lobes faceing down. Then install sprocket and chain. Tensioner, then bolts for sprocket. I tighten the first and using the timing bolt I rotate the shaft 180degrees to Install the other sprocket bolt. Then I check the timing by spinning the timeing bolt a few more rounds. Come back to check top dead center for the camshaft and it's not the same as I installed. Is somethibg slipping on the bottom end? Is it supposed to do this. I don't think so only because I tried starting the bike after the piston Install and it wouldnt start. I think timing is the problem. Is there a way to adjust anything on the bottom end sprocket and components to fix the problem?

I am on a trip from NY to cAnada and south to Argentina. Currently in Mexico and made friends with some locals who are letting me fix my bike and live with them.. I can get parts but they take a while to come looking for all perspectives to solve this problem. 

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This is what's my timing chain is doing as well.. not sure if anyone knows the answer to his question..

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Bet the cam chain isn't on the lower gear. It is being turned by friction of the chain between the gear teeth and the case.

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