Question about 1980 Yamaha XJ 650

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Timimg chain tension

How do I adjust the tension on my cam timing chain Yamana1980-XJ650 Maxim in line 4 cyl.

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  • brownracing Apr 14, 2009

    The bike has got 20.000 miles on it replace the chain?? NO WAY.

  • damianturk20 Apr 24, 2009

    I have an 82 xj 650. Need to know the correct procedure for tightening the cam chain. And, any advice/hints regarding starting and bad idling would be very helpfull. Have thoroughly cleaned the carbs, still very lumpy at idle.

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  • 28 Answers

Replace.
and when you replace, also replace gears, as a new chain will eat up the old gears, and vise-versa.

Posted on Apr 14, 2009

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I am trying to determine if the adjustment bolt located below the carbs between the second and third cylinders is for setting the cam chain tension and how to set it . There is some cam chain noise at low...


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Pop the cover off, turn the rotor until the C mark is aligned, Then loosen up the 12 mm nut that is on the 10 mm headed screw. Then loosen up the 10 mm headed screw. When the screw is loosened up it will take up slack and put spring pressure on the rod that puts pressure on the cam chain. Now that its taken up the slack tighten down the 10 mm headed stud and then the 12 mm locknut. That should take out all play in the cam chain tensioner. The cam chain tensioner is located under the carb boots from the engine to the carbs.
Hope this helps!

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