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1980 CX500D
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Discussion Starter · #1 ·
Hi All-

Since I picked this one up not running, no history, and haven't been able to get it going, I thought I should l take it down to bare bones. As you can see, the screw boss, screw head and casing have suffered and need replacement parts along with a broken right chain guide etc.

My questions is- are their any new parts available and from who (in North America - preferably Canada). Secondly, if I go with the stock parts, am I replacing something that broke with something that is likely to break again as this was a weak point of the 500's from the factory? Are there aftermarket replacements that are better?

Thanks!
 

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The damaged bolt is very common. I'd leave it alone. Replacement blades can be found at David Silvers Spares. They are repo's and have a mixed history of failure. I have some in my son's bike and have had no issues. But others have. I may have put them in a friend's bike but dont recall for sure
 

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1980 CX500D
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Discussion Starter · #3 ·
Thanks nolimitz- need the chain as well - will take a look athwart they have.
 

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'84 CX650E that is evolving into a GL500
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BTW: The piece that is broken is the camchain tensioner. The part that pushes the camchain tensioner against the chain is the camchain tensioner adjuster.

Edit: see post #14 (thanks Randall)
 

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1980 CX500D
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Discussion Starter · #5 ·
BTW: The piece that is broken is the camchain tensioner. The part that pushes the adjuster against the chain is the camchain tensioner adjuster.
I stand corrected- found one on Kijiji for $50- seems like high $$?
 

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Since you will have the engine apart, check the internal condition of the oil pump. Steel from the ground away bolt head can damage the oil pump.
 

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I just received my manual cam chain tensioner from DSS today I did not realize they were problematic. I thought just the autos were a problem.
 

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1978 CX500 "The Grub", 1983 GL650I "Nimbus"
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BTW: The piece that is broken is the camchain tensioner. The part that pushes the adjuster against the chain is the camchain tensioner adjuster.
The adjuster pushes the adjuster?
 

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1978 CX500 "The Grub", 1983 GL650I "Nimbus"
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If one type is bad I wouldn't trust the other the from the same supplier.
They are different parts.
Timzim, can you post a photo? I'm curious to compare it to old stock.
 

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'84 CX650E that is evolving into a GL500
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The camchain tensioner adjuster pushes against the camchain tensioner against the chain. If you check you'll see that's what it says (now ;-)

Yeah, they are different parts but they have the same basic construction so I still wouldn't trust them.
 

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When the bolt sticking through the rear cover is loosened the cam chain tension is adjusted. Much simpler and less confusing to simply call the part which moves after the bollt is loosened the tension adjuster. The tension adjuster causes the tensioner to move thus adjusting the cam chain tension.
 

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1980 CX500D
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Discussion Starter · #16 ·
Thanks Mike- definitely cleaning out everything, lots of bits in the bottom of the engine case.
 

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I will try and post a picture tonight, but it looks just like the one on their website. "From a manufacturer with a proven record" I really don't want to be cleaning bits from my cases .
 

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'84 CX650E that is evolving into a GL500
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Yes. We've had a few reports over the years of people who decided the original o-ring on the adjuster bolt looked good enough to leave only to have it fail soon after and allow oil to trickle down the back of the engine.
 

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1980 CX500D
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Discussion Starter · #20 ·
The"complete" gasket sets always seem short of O rings, and the CX has a lot of them.
 
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