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Discussion Starter · #1 ·
Appears I'm having a consistent oil leak. From what I'm seeing this is pretty common and looks like I just need to replace the front gasket, correct? Only leaks when running.

Looks like it's coming from here
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1978 CX500 "The Grub", 1983 GL650I "Nimbus"
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The gasket has been known to sag in that spot if installation isn't done carefully. Depending on how the gasket was dressed (meaning how easily it releases from the mating surfaces), you might get away with repositioning the current gasket. I do recommend having a replacement on hand.
 

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Im viewing on a phone....Randall has given you guideance....
One point...
Is the gap at the mating surface bigger than usual or my imagination.... or has black sealant been applied?
 

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Good advise already given.
Perhaps worth it to first check if those bolts are all torqued correctly, and or just torque them correctly and see if the leak is still there, before you start opening up.
 

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Look at the bright side ... at least changing the gasket will give you a chance to finally clean up that crusty engine and exhaust.
 
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I had the same leak on mine. Order a gasket and do it right. Inspect the oil pump and chain while you have it opened up. Just my opinion
Steve
 

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Appears I'm having a consistent oil leak. From what I'm seeing this is pretty common and looks like I just need to replace the front gasket, correct? Only leaks when running.

Looks like it's coming from here

This might be my lack of familiarity with these bikes, but why does this bolt look off? Was/is it just loose from you looking at it?


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Discussion Starter · #8 ·
Look at the bright side ... at least changing the gasket will give you a chance to finally clean up that crusty engine and exhaust.
Yeah, I've already done that so hoping this won't be too much hassle
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Discussion Starter · #10 ·
While you're in there take a look at the Tach/cam cover seals, gaskets
Do you have more information on this? What should I be looking for? If it's worth replacing while I'm in there I'd def like to do it. I've already replaced the mechanical seal and replaced the clutch plates/springs. Running great aside from this oil leak.
 

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pull the oil pump intake screen off and clean it - this should be done regularly but no one ever does.
 

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Do you have more information on this? What should I be looking for? If it's worth replacing while I'm in there I'd def like to do it. I've already replaced the mechanical seal and replaced the clutch plates/springs. Running great aside from this oil leak.
If there is no sign of leaking from the gasket or from the tach cable oil seal then do nothing.
 
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It's a separate cover. The only reason to address it now is you can get to it when the radiator is removed.
 
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It could be that the leak is actually above at the tach drive, and the case gasket is fine.
 

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Discussion Starter · #17 ·
It could be that the leak is actually above at the tach drive, and the case gasket is fine.
I had not considered this... I have removed the tachometer cable (using Trailtech Vapor gauges). I wonder if maybe I didn't plug the hole (where the old tach cable was) and it's leaking from there. Trying to figure out the best way to test this.
 

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Pull the radiator and gain easy access.You are going to have to do that anyway , no matter where the leak is .
 

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I had not considered this... I have removed the tachometer cable (using Trailtech Vapor gauges). I wonder if maybe I didn't plug the hole (where the old tach cable was) and it's leaking from there. Trying to figure out the best way to test this.
You shouldn't need to rely on a plug to keep the oil in. There's an oil seal for that.
The only real reason to cap the drive after removing the tach cable is to keep junk out.
 

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Trying to figure out the best way to test this.
Clean the area around the suspected leak then apply a powder such as talcum or flour. Run the engine until you see some oil leaking. The track in the powder will tell you if the leak is from the area you suspect or from higher up. If it is indeed from higher up behind the radiator then the next step would be to remove the radiator and see what is happening there.
 
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