Replacement cam chain tensioners...
Replacement cam chain tensioners...What are the options for replacement cam chain tensioners? At this point, is it just a matter of finding the least damaged used one you can find? I have not seen a definitive solution to what I think is an issue that faces almost anyone with one of these nearly 50 year old engines. Is the demand not high enough for someone to make a new rubber wheel for these things?
cam chain tensionerhello !!!
site experts claim that the parts are available (and very expensive) they are partly right but against all developments and improvements !!! For my part, with all models cb, c, & cl to restore , I watch the way for new materials like Delrin for the rollers or a blade tensioner !!! see the post NBD925 "cam chain tensioner 305" is a good approach to the problem !!! friendly ,MK cb 72
cb 77 ,c77 ,cl77 velocette thruxton Delrin doesn't last forever either but it does make for a good replacement. Delrin is a family of resins and DuPont list bearings and cams as suitable applications but I haven't studied the tech specs to confirm that it's suitable.
You certainly don't want your old roller OEM to disintegrate. I have had that unhappy problem a couple of times - both at Phillip Island and it's not pretty taking out Z shaped valves and broken rocker arms. On the street that's a lot less likely to happen. LM can probably say whether it ever happens. If OEM rollers are available that's what I would fit.
Other than finding ones the PO had over tensioned (pushed the adjuster in rather than allow the spring to set tension) and the wheel had rail road tracks I did find a engine that the center wheel had come loose and it was destroyed as was the tension wheel. ............lm
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