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Discussion Starter #1
Hello everyone!

As I was working in two CX500, both '79, we figured that a lot of people had had a lot of problems with the cam chain tensioner.
We were thinking about a solution for it, so we remplace the OEM cam chain tensioner with other that I had worked.

Is based in an special tensioner and a custom plate made with CAD-CAM.

Here come some photos,

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Here is the part made with CAD-CAM

Cam_Chain.2.jpg

As soon as we ride the motorcycle, we will comment the results
Hope you like it! ;)
 

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Discussion Starter #5
The slider is made of polyethylene, so it can support the chain and the tensioner is automatic
 

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If this works out, I'll surely be interested. please keep us posted. How long do you intend to run the engine before checking the condition of the new tensioner?
Dan
 

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"Grenade!"

I'm curious to see how well the material holds up to the chain sliding. It may be strong, but is it safe in oil, repeated heat cycles, constant movement.
I really hope it works, but I wouldn't hold my breath.

I foresee some kind of strange gooey sludge clogging up the oil filter (among other things).
Don't get me wrong, I am rooting for you, but I'm a skeptic.
 

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I have seen, am aware of not using the auto tensioner. The manual system was installed. Seems that a little play is a good thing on the tensioner/chain. The auto tensioner tends to allow vibrations since it is spring operated. Just my thoughts.
 

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Personally, I'm not a huge fan of chain/belt timing methods as they both require tensioners, wear/stretch, and eventually fail usually with catastrophic results.
I could never understand why manufactures didn't utilize gear drives.

As for the materials in this device, I'm sure if it is not better than what was used 30+ years ago, that surely there is something out there by now that is superior!
 

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Many timing chains in the past where not tensioned. trouble was that it took out the gears sooner due to vibration/slapping. so the best way was to apply a tensioning system to help that out. Check out the trouble they had with the pontiac 2000 which did not use a auto tensioner. Striped the belt in a short time. My chev astro uses the old system timming chain and I have over 300,000 miles on it. So I can complain about what I am saying. So what works good at what rpm?
 

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you had me till i saw you were usiing ldpe (low density pe)

i can almost tell you how that will end up after a few hot days '

but here


  • Maximum Temperature: 176°F 80°C the internal temp of the rear case is almost always at or in excess of this
  • Minimum Temperature: -58°F -50°C
  • Autoclavable: No
  • Melting Point: 248°F 120°C
  • Tensile Strength: 1700 psi

  • Hardness: SD55
  • UV Resistance: Poor
  • Translucent
  • Excellent flexibility
  • Specific Gravity: 0.92
 

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If you get it worked out all right the other guide is unavailable You would really have something if you sold the tensioner and both guides as a kit.

CX 500 Deluxe
 

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With a better plastic this look viable. Of course I barely know my a$$ from a dark hole in the
ground about cam chain tensioners and such. I am hopefully optimistic that it could be good.
 

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The original parts are steel with a rubber lining. I don't expect a relatively soft plastic to stand up in that application.

And speaking as someone who has broken a camchain, I don't think anything designed to extend the life of a camchain by increasing the range of adjustment is a very good idea at all.
 

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Any news on this? So all that's really needed is a better plastic bit? Shouldn't that be the easiest possible part to fabricate? I'm in need of a cam tensioner that isn't prohibitively expensive. :/
 
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