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xr 70 cam-chain tensioner

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I bought my son a xr 70 a couple weeks ago runs great. then I screwed it all up. I've read several other posts on this but nothing is helping. I pulled the cam tensioner bolt by mistake instead of the oil drain plug. I put it all back together the way it was but now its blowing oil out the exaust really bad. I thought run it alittle maybe i put too much oil in it but thats not the case. It runs fine other than the smoke ( its like 20 times worse than a 2 stroke) so i dont know what to think. I can hear the cam chain hitting alittle inside too. So i dont know if i jumped timing or what. Thanks alot, great forum!

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