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Author Topic: 73 CB500 Four - Gas Tank Bolt Gone  (Read 2426 times)

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Offline Chachi

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73 CB500 Four - Gas Tank Bolt Gone
« on: October 26, 2011, 10:44:54 AM »
Riding today and tank felt loose where it meets seat. Looks like the bolt snapped with nut that secures it there. Just replace with new bolt and nut and move on? Just want to make sure there is nothing else to evaluate. Seems easy enough to put something else on. I can reach hole ok to tighten new bolt by taking air filter out. Missing anything?
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73 CB750 K3
72 CB500 K1 - Sold
75 MR50 Elsinore K1

Offline dave500

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Re: 73 CB500 Four - Gas Tank Bolt Gone
« Reply #1 on: October 26, 2011, 12:31:41 PM »
i dont think there is a bolt there,its held under a rubber grommet.
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Offline Greggo

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Re: 73 CB500 Four - Gas Tank Bolt Gone
« Reply #2 on: October 26, 2011, 12:35:47 PM »
Quote from: dave500 on October 26, 2011, 12:31:41 PM
i dont think there is a bolt there,its held under a rubber grommet.

Yup, rubber grommet.  Check ebay for 'cb500 tank rubber' to see what we're talking about. 
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Offline Chachi

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Re: 73 CB500 Four - Gas Tank Bolt Gone
« Reply #3 on: October 26, 2011, 12:59:21 PM »
Ok. The screw is there and fine (from the top) as well as the larger rectangular pad/spacer, just missing the piece you mentioned. I'll bolt on for now, but get a new proper one. Thanks!
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73 CB750 K3
72 CB500 K1 - Sold
75 MR50 Elsinore K1

Offline Bob3050

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Re: 73 CB500 Four - Gas Tank Bolt Gone
« Reply #4 on: October 26, 2011, 01:24:30 PM »
If the rear of your tank is secured with a bolt then you have something other than stock. The rear hold down on a CB500 is a rubber pad/strap that slides on to 2 tangs on the frame and stretches over the rear tank flange. How about posting a picture of your mount?
Bob
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Offline Rigid

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Re: 73 CB500 Four - Gas Tank Bolt Gone
« Reply #5 on: October 26, 2011, 01:42:55 PM »
And DON'T drill the frame for a temp fix, it is bad form.  :)
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Offline Chachi

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Re: 73 CB500 Four - Gas Tank Bolt Gone
« Reply #6 on: October 26, 2011, 03:31:30 PM »
Sorry, meant to reply sooner... I thought there was a hole aligned below with the screw that is in place to hold the rubber mounts. It was not aligned, so my temporary nut/bolt idea was no good. Zip-tied it for now until I can get a new rubber grommet. Thanks.
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73 CB750 K3
72 CB500 K1 - Sold
75 MR50 Elsinore K1

Offline SohRon

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Re: 73 CB500 Four - Gas Tank Bolt Gone
« Reply #7 on: October 27, 2011, 07:41:47 AM »
I'm thinking the bolt you're referring to is the front mounting bolt for the air cleaner. That's really the only bolt in this area. If it's missing, your AC is probably in danger of falling out. Otherwise, check to see if you're missing the front two tank mount grommets as well as the rear one.

Of course, that's only if you're still using the stock AC.
« Last Edit: October 27, 2011, 07:51:37 AM by SohRon »
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Assembling my '74 CB550: http://forums.sohc4.net/index.php?topic=86697.0
Assembly of the Right-hand Switch (a rebuilder's guide):  http://forums.sohc4.net/index.php?topic=80532.0
Installing stock 4X4 exhaust: CB500-CB550 K: http://forums.sohc4.net/index.php?topic=82323.0
CB550 Assembly Manual: http://forums.sohc4.net/index.php/topic,151576.0.html

Offline Chachi

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Re: 73 CB500 Four - Gas Tank Bolt Gone
« Reply #8 on: October 27, 2011, 08:18:30 AM »
Air cleaner bolt is intact. There is a bolt/screw that mounts down through the rectangular rubber pad/spacer btwn the tank and frame and the grommet was on the other end of that. I think I am simply missing that rear grommet. The rest feels ok, but I can not actually get a visual on the front tank grommets.
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73 CB750 K3
72 CB500 K1 - Sold
75 MR50 Elsinore K1

Offline Chachi

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Re: 73 CB500 Four - Gas Tank Bolt Gone
« Reply #9 on: October 27, 2011, 08:35:56 AM »
Confused. What am I missing?
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73 CB750 K3
72 CB500 K1 - Sold
75 MR50 Elsinore K1

Offline Chachi

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Re: 73 CB500 Four - Gas Tank Bolt Gone - With Pics
« Reply #10 on: October 27, 2011, 09:07:14 AM »
Pics...
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73 CB750 K3
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75 MR50 Elsinore K1

Offline Rigid

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Re: 73 CB500 Four - Gas Tank Bolt Gone
« Reply #11 on: October 27, 2011, 09:36:52 AM »
That rubber piece in your hand is not correct.  You need one that inserts on those two tabs attached to the frame and lifts up over the tab that should be on the back of your tank.  Wrong tank also maybe?
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Offline johnrdupree

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Re: 73 CB500 Four - Gas Tank Bolt Gone
« Reply #12 on: October 27, 2011, 09:49:39 AM »
Yep, you need the correct rear tank rubber, part #17613-286-000.  Call your local Honda dealer, or get one online from your favorite vendor.

~john
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1975 Honda CB550K1
1991 Honda ST1100
1989 Suzuki GS500E
1954 NSU Lambretta 125 (long term project)

Offline Chachi

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Re: 73 CB500 Four - Gas Tank Bolt Gone
« Reply #13 on: October 27, 2011, 10:42:02 AM »
That makes more sense. No screw needed then? See the screw in my very first pic... I see where that is not needed with the correct rubber mount, but is that screw hole on the tank original or was that added to mod with the rubber piece that I have? Frame looks original with the tabs, but does tank portion look right/stock?
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73 CB750 K3
72 CB500 K1 - Sold
75 MR50 Elsinore K1

Offline SohRon

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Re: 73 CB500 Four - Gas Tank Bolt Gone
« Reply #14 on: October 27, 2011, 11:12:42 AM »
Here's the grommet you need and its attachment to the bike. No bolts or other "spacers":







The tank just slides into the shaped slot in the grommet. Hope this clears things up.
« Last Edit: October 27, 2011, 11:14:25 AM by SohRon »
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"He slipped back down the alley with some roly-poly little bat-faced girl..."

Assembling my '74 CB550: http://forums.sohc4.net/index.php?topic=86697.0
Assembly of the Right-hand Switch (a rebuilder's guide):  http://forums.sohc4.net/index.php?topic=80532.0
Installing stock 4X4 exhaust: CB500-CB550 K: http://forums.sohc4.net/index.php?topic=82323.0
CB550 Assembly Manual: http://forums.sohc4.net/index.php/topic,151576.0.html

Offline johnrdupree

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Re: 73 CB500 Four - Gas Tank Bolt Gone
« Reply #15 on: October 27, 2011, 11:14:03 AM »
Your tank appears stock, and the hole is supposed to be there.  I don't know why it's there (maybe the factory hung it from a hook for painting), but it has nothing to do with mounting the tank.

~john
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1975 Honda CB550K1
1991 Honda ST1100
1989 Suzuki GS500E
1954 NSU Lambretta 125 (long term project)

Offline Chachi

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Re: 73 CB500 Four - Gas Tank Bolt Gone
« Reply #16 on: October 27, 2011, 11:17:54 AM »
Many thanks (seriously). My local shop has to order... zip-tie with whatever my rubber mount is until then.
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73 CB750 K3
72 CB500 K1 - Sold
75 MR50 Elsinore K1
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