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Cam Chain TENSION

  • Thread starter Thread starter DMPLATT
  • Start date Start date
D

DMPLATT

Guest
Just a question here.
When I did my valve adjustment I noticed that at 1 setting the Cam chain was Taught on top, between the 2 cams. Yet at the other setting, it had slack in it. Is this normal? I can't find anything in the factory manual except how to set the tensioner.

I'm not experiencing any trouble that I know of. I don't hear any slapping or anything. Just curious if this sounds normal?

Thanks.
 
If you set the tensioner up the way the manual says Dave, and given that all is in good working order then your set. It's an auto chain tensioner and it takes care of the tention for you.

Smart old bikes, aren't they? :)
 
Thanks, but I DIDN'T do anything to the tensioner yet, and don't really want to. I was just a bit concerned about how the chain is taught at 1 valve setting, and slack at the other?
 
Some variance in cam chain tension as the engine is rotated by hand is normal. The auto tensioner wasnt designed to operate at 1/2 of an rpm. LOL

Earl



DMPLATT said:
Thanks, but I DIDN'T do anything to the tensioner yet, and don't really want to. I was just a bit concerned about how the chain is taught at 1 valve setting, and slack at the other?
Click to expand...
 
earlfor said:
Some variance in cam chain tension as the engine is rotated by hand is normal. The auto tensioner wasnt designed to operate at 1/2 of an rpm. LOL

Earl
Click to expand...

:lol: :lol: :lol: 1/2 an RPM. You give me too much credit. :lol: :lol:

Thanks
I feel better.
 
The last time I set my manual tensioner I had the valve cover off so I was able to feel the tensioner guide as I was tightening the adjuster. Maybe to give yourself peace of mind you could physically test how much slack there is between the crank and the intake cam sprocket.

Jeff
 
Most likely what you see/feel is one of the other cam lobes (ramps) on either cam is trying to be push CW or CCW by the springs/rockers. Static timing causing slack in the chain at that point in time.

Extreme example is, back off the gas and excess slack can cause a change in valve timing or jump a tooth. Very bad for an advance intake cam. That's a good reason why race engine use manual adjuster's with big cams and small v/p clearance.
 
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