Author Topic: Allen Bolts and tappet cover  (Read 649 times)

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Offline DavePhipps

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Allen Bolts and tappet cover
« on: April 20, 2012, 11:27:10 am »
When rebuilding my CB500 I desided to replace the cam cover JIS screws with allen bolts. Went great til I got to the tappet covers. There is interference with the bolts and some of the covers. Has anyone else run into this? Should I get the file out and reshape the head of the allen bolts to give some room for the tappet covers?
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Offline Duanob

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Re: Allen Bolts and tappet cover
« Reply #1 on: April 20, 2012, 12:55:53 pm »
Yep. I just learned to take the tappet cover off first before the allen bolt. If I knew someone with a lathe I would have them turn down the heads on the allen bolts a C-hair. But for now I deal with it.
The only problem left on my bike is the nut that holds onto the handle bars! ;)

1976 CB550K2 Resurrected
1976 CB550F2 Barn Find
1979 CX500 Delux "HONDA-GUZZI"

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bollingball

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Re: Allen Bolts and tappet cover
« Reply #2 on: April 20, 2012, 01:17:41 pm »
Maybe chuck them up in a drill motor and put a file on the head. You could put double nuts on first to save the threads.

Ken

Offline Grabcon

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Re: Allen Bolts and tappet cover
« Reply #3 on: April 20, 2012, 01:30:24 pm »
If those are stainless you can get away with turning them down. the Cad plated ones will rust once the plating is removed.
CB750   1974
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Offline dave500

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Re: Allen Bolts and tappet cover
« Reply #4 on: April 20, 2012, 02:13:15 pm »
i got little domed button headed ones.
« Last Edit: April 20, 2012, 02:20:29 pm by dave500 »

Offline Tugboat

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Re: Allen Bolts and tappet cover
« Reply #5 on: April 20, 2012, 02:30:45 pm »
^ +1
That's what I did too on my 500 rebuild.. I sent the guy I bought them from on ebay a message to let him know this was an issue, and he replied that he'd sold "hundreds" of these kits and never had a complaint. Not likely!
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Offline DavePhipps

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Re: Allen Bolts and tappet cover
« Reply #6 on: April 20, 2012, 02:47:52 pm »
^ +1
That's what I did too on my 500 rebuild.. I sent the guy I bought them from on ebay a message to let him know this was an issue, and he replied that he'd sold "hundreds" of these kits and never had a complaint. Not likely!
Ebay here too. I'll be sending the guy a message later tonight. I'll try thr poor mans lathe (drill and file)
Bikes:
90 FZR600 RA
74 CB550k
78 GL1000
72 CB500K

Offline Bailgang

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Re: Allen Bolts and tappet cover
« Reply #7 on: April 20, 2012, 03:39:30 pm »
I got my set of stainless screws off ebay as well and have the same problem. On my 550 it only effects the exh tappet covers and the interference is only when trying to install or remove the tappet cover with the stainless allen screw already tightened. If the tappet cover is tightened then the stainless allen screw threads in and tightens like it should. I basically have to wait to install the stainless screw until after I've tightened the tappet cover and then of course remove the stainless screw prior to removing the tappet cover. An inconvenience but not that big of a deal to me because those screws next to the exh tappet covers are easy to get to and still an improvement over the old rusty chewed up pan head screws that it originally had.

Bail is my last name guys so just call me Scott


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