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1978 CX500 "The Grub", 1983 GL650I "Nimbus"
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Discussion Starter · #1 ·
While I have the tank off the GL650 to replace the petcock and deal with the weepy valve cover gasket, I thought I'd check clearance on the valves. But, I'm not finding the spec in the FSM.
The service schedule in the GL650 addendum points to page 3-7 in the GL500 section. Are the specified clearances the same as the 500? I had thought they were different.
Thanks.
 

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I would expect GL650 to be the same as CX650E in which case the clearances are 0.005" exhaust and 0.003" intake; this from the CX650E FSM.
 

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1978 CX500 "The Grub", 1983 GL650I "Nimbus"
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12,089 Posts
Discussion Starter · #3 ·
Thanks. I'll take another look at the manual. Maybe I just overlooked it.
 

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The CX650E manual gives 0.10 and 0.12 mm and 0.003 and 0.005 ". My calculator says that 0.10 mm is close to 0.004 ". A mistake in the FSM?
 

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In the CX650E owner's manual it gives the specs as 0.10 ( 0.004) and 0.12 ( 0.005). Interesting.
 

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1978 CX500 "The Grub", 1983 GL650I "Nimbus"
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12,089 Posts
Discussion Starter · #8 ·
I thought it was .004 and .005 (vs the 500's .003 and .004), but I can't recall where I found that.
 

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I'm pretty certain it's 4 and 5.

Until you find out for sure run with that as, if incorrect 3 is tight on the intake.

If a clearance is wrong better loose than tight.

I'll check my Haynes and Clymers later. I don't have the FSM for the 650.

Google gives 4 and 5 at the top of the page also.
 

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Page 22-3 from the CX650E Addendum. Arrow to indicate error in FSM.

Font Rectangle Parallel Pattern Paper
 

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'84 CX650E that is evolving into a GL500
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There is no excuse for anyone on this forum not having the FSM for any of these bikes when they are in the Wiki and on Motofaction and I am a big believer in teaching people how to find the answer instead of handing it to them.

Randall is pretty good at looking things up but couldn't find it. I told him where to look so he will know for next time.
 

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Bob. if I was working on a 650 most things are the same as the 500. Auto tensioner. Check. TI ignition. Check.

I knew the valve clearance or have paper manuals to consult. That's what I use.

I only asked.

Generally when a thing is stated a link etc. is posted.

Lazy?

Asking questions does not contravene forum rules and is not open to moderation.
 

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81 Gl500i 83 CX650E
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On my high mileage engines I found they run quieter at 3 thou and 4 thou , never have had a valve tighten up but usually find a exhaust valve a couple of thou loose . It would be safer of course to go to 4 and 5 if you have a freshly rebuilt or extremely low mileage motor as in parts will be seating in and ocassionly take up the clearance, happy riding
 
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