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Discussion Starter · #1 ·
So it took me a long time to do, between all the other projects I had going, but I finally finished putting the bike back together after replacing the cam chain. There was some pretty bad wear inside the case from that thing.



Unfortunately, the bike is still noisy. It's pretty decent when the motor is cold, but once it's warmed up, it's still pretty noisy (albeit not as bad as before I did the chain).



I've properly tensioned the chain, and have checked/adjusted the valves (.003 and .004 with the motor stone cold). What else can I do?
 

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Does it make any difference clutch in or out?  Maybe fan?  Possible to record the noise?
 

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If it's not as loud once the bike is warmed up as you've stated then it's probably clutch rattle...very, very common. Not a necessity to fix if that's what it is, just irritating.
 

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1978 CX500 "The Grub", 1983 GL650I "Nimbus"
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I've properly tensioned the chain, and have checked/adjusted the valves (.003 and .004 with the motor stone cold).
Just to verify, you set the chain tension at Left TDC on the compression stroke, correct?



R
 

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Discussion Starter · #5 ·
Just to verify, you set the chain tension at Left TDC on the compression stroke, correct?



R


That is correct.



Pretty sure it's not the clutch. Rickbert, it's worse when hot, not better.



Just took a video, I'll get it up soon.
 

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Discussion Starter · #6 ·
Here was before doing the cam chain:



[media]http://www.youtube.com/watch?v=sUvnOSpExgA[/media]





Here is after doing the cam chain:

[media]http://www.youtube.com/watch?v=Ux7Rv6KBiQw[/media]
 

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Before I heard the video, I was going to guess that you need to change your valve tappet screw, but that does not sound like the tappets.

Internet sound quality is not that good, but I'd take a look at the main bearings.

Does this bike have a tendency to overheat at all?



Did you find any copper in your oil?
 

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Discussion Starter · #9 ·
Before I heard the video, I was going to guess that you need to change your valve tappet screw, but that does not sound like the tappets.

Internet sound quality is not that good, but I'd take a look at the main bearings.

Does this bike have a tendency to overheat at all?



Did you find any copper in your oil?


Oil is squeaky clean, even before replacing the chain. Bike doesn't overheat. Right after I buttoned it back up it seemed to run a bit warmer than usual, but that seems to have worked itself out.
 

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Does clutch rattle always get quieter as it warms up?

Conversely, does main bearing failure always get louder?





Just wondering! Every bearing knock I have ever heard got louder when hot.
 

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The,"Main" bearings rarely go on these engines not to be confused with the Big-end shells/crank shaft bearings and crank which can be damaged easily dependent on the running conditions they receive.



A well serviced CX can easily go over 140,000 Km+



http://globalcxglvtwins.hostingdelivered.com/viewtopic.php?f=20&t=289



With no bottom end problems.Some in Australia are over the 200,000 Km mark.



Some quick or quicker ways to ruin the engine.



Not taking notice of Cam-chain knock in time and failure to replace the cam-chain and or failure to adjust on a regular basis is a manual cam-chain.



Not changing oil+filter and or coolant often enough.



Running the engine above it's nominal operating temperature for prolonged periods.



Running the engine on a lean mixture for prolonged periods(Overheating is a symptom).
 

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Oww!

the mic on that cam isnt coping well

also the ( straight through?) pipes are drowning out the engine noise

You can stuff rags up the pipes or find other ways to muffle it

while you make a video

I find that helps
 

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Discussion Starter · #13 ·
I think it might just be the fan. The noise is much louder in the front than it is in the rear. Which is definitely not how it was prior to replacing the cam chain. I think I may have broken the fan on reinstallation.




Sucks I'm broke and can't afford an electric fan right now.
 

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I think it might just be the fan. The noise is much louder in the front than it is in the rear. Which is definitely not how it was prior to replacing the cam chain. I think I may have broken the fan on reinstallation.




Sucks I'm broke and can't afford an electric fan right now.


Dude, an electric fan from a Ninja can be had on ebay for ~10-15 bucks.
 

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Discussion Starter · #18 ·
Yep, tappets done at TDC on compression. I have not pulled them to check the faces though.



I'm fairly confident I got the timing correct when installing the chain. If I didn't I would assume the bike wouldn't run as well, but it runs much better/stronger than it did with the old stretched chain.
 

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Yep, tappets done at TDC on compression. I have not pulled them to check the faces though.



I'm fairly confident I got the timing correct when installing the chain. If I didn't I would assume the bike wouldn't run as well, but it runs much better/stronger than it did with the old stretched chain.


Is there any chance of getting a better sound recording?
 

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Discussion Starter · #20 ·
I'll try this weekend. I have my phone and a cheap camera, neither of which are very good with audio. I'll see what I can come up with though. If I have time I might pull the fan and see if it's still noisy.
 
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