1984 XJ750RL Cam Chain Question

My XJ750RL (SECA) 1984 needs the cam chain tensioner tightened.

Anybody familiar with this proceedure?

Do I just slowly tighten the adjuster until the noise goes away, or gets
quieter...?

Do I adjust it with the engine running and warmed up?

I read that first the tensioner breaks down, then the valves start
to break down, then it is only a matter of time before major engine
probs starts.

Even if I buy a new tensioner, will it have to be adjusted as well?

Should this tensioner be adjusted at regular intervals, I don't think mine
has ever been adjusted so there must be "room" left to tighten?

Thanks for any help on this subject.

P.S If anyone needs the XJ750 CD, I can upload it and post the link.


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This should have an automatic tensioner which needs no adjustment. If there is noise, it might be stuck, or the chain may be slack and hitting the valve cover during operation. If stuck, you can remove the center plug, pull out the spring and push in on the tensioner to see if it is slack. It may not be possible to re-insert the spring with the carbs on, however, (lack of space to wrench) so do it at your own risk.

 

http://www.xjbikes.com/Forums/viewtopic/t=1203.html

If yours looks like this is revelent....

 

The tensioner is automatic as stated. It may however be stuck. To remedy this first set he timing to the C mark (not the T mark) indicated on the timing plate on the inside left point cover. Then remove the tensioner and clean it with a spray can of degreaser. Take the nut at the end off carefully so you don't loose the spring. Push the adjuster all the way back in while holding down the ratchet catch with your finger. Then re oil it well with lots of oil and reinstall with the timing pointer still at the C mark. Once in intall the end nut and that should set the tension.
As for the statement of firs te tensione rthen the valves then the engine?....Bull! Only if you neglect everything. The camchain does present a danger to the valves if it breaks or slips off due to the tensioner allowing it to be too loose. The pistons will then slam into open valves and cause mucho damage. But this is quite rare for these bikes. Mainly because you have to neglect the obvious noise the camchain would make. A loose camchain doesn't hurt the valves like not setting the shims correctly would do. Valve adjustment is the main sustainer of valves. Neglect it and you will have burnt valves and poor performance.