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xr 250 cam chain tensioner

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hi guys i have just bought a 2004 xr 250r in need of top end rebuild and i need a little help how do i release cam chain tension there is no tensioner on outside of barrel and to rebuild how do i know if the cam is the right way up when i fit the sprocket also how do you know when crank is at TDC on compression stroke to set timming 

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