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Author Topic: P.O. JB Weld job. CB750K2  (Read 2062 times)

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Offline TinyHouseYugeGarage

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P.O. JB Weld job. CB750K2
« on: December 15, 2016, 07:18:36 PM »
I was replacing my driveshaft oil seal today and noticed what looks like a glob of JB Weld below it. I started scraping at it with a razor blade, and it definitely seemed like softer material than the surrounding aluminum case. I then took some sandpaper to it to level down the surface some more. I am perplexed as to why this is here.

I have three questions hopefully you guys can help answer:

Doesn't this seem like a weird spot for damage resulting from a thrown chain?
Why is the repair a perfect circle?
Is this something I need to worry about?

I just got this bike and have not ridden it extensively yet, just up and down the drive way. I'm thinking I'll just run the bike without the sprocket cover on for a while so I can keep and eye on the mystery spot. Maybe I'll glob some more JB on it.  :o
« Last Edit: December 15, 2016, 07:22:50 PM by Phainopepla »
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1972 Honda CB750K2
1973 Honda CB350F
1966 Honda CL77 305 Scrambler
1965 Honda CB160

Offline TinyHouseYugeGarage

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Re: P.O. JB Weld job. CB750K2
« Reply #1 on: December 15, 2016, 07:37:06 PM »
AHA! Just found some pictures of other people's bikes with the same glob in the same spot. I guess it's not a JB weld, but something else. What a relief. What the heck is it?
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1972 Honda CB750K2
1973 Honda CB350F
1966 Honda CL77 305 Scrambler
1965 Honda CB160

Offline Medyo Bastos

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Re: P.O. JB Weld job. CB750K2
« Reply #2 on: December 15, 2016, 07:37:34 PM »
Your repair looks good from my house!


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Offline BomberMann650

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Re: P.O. JB Weld job. CB750K2
« Reply #3 on: December 15, 2016, 07:50:42 PM »
I've used quiksteel for the odd job now and then.  It could be that.
I cant tell ya much else.
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Offline madmtnmotors

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Re: P.O. JB Weld job. CB750K2
« Reply #4 on: December 15, 2016, 07:53:00 PM »
Part of the problem is you have the spark plug in the wrong place!  :o  :P  ;D  ;)
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Offline TinyHouseYugeGarage

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Re: P.O. JB Weld job. CB750K2
« Reply #5 on: December 15, 2016, 08:17:12 PM »
Oh, that's why it wont run! ;). I'm still looking for a proper chain oiler plug...

Here is a picture from someone else's post way back in 2012. You can see the same mystery glob below their oil seal as well (slightly below the circled area).

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1972 Honda CB750K2
1973 Honda CB350F
1966 Honda CL77 305 Scrambler
1965 Honda CB160

Offline ekpent

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Re: P.O. JB Weld job. CB750K2
« Reply #6 on: December 16, 2016, 04:56:32 AM »
  I've read where people have used a cut off spark plug for an oiler blocker, think member Frank at 754 was making a little more elegant plug for that.  Not sure but maybe that plugged hole your looking at had something to do with the casting process at the factory, another one of those things I have never noticed after all these years with 750's.
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Offline 754

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Re: P.O. JB Weld job. CB750K2
« Reply #7 on: December 16, 2016, 06:44:34 AM »
Its probably a drilled oil passage.. And the plug is welded in place so it never moves..
 Not sure , i think I am out of plugs.
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Online Don R

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Re: P.O. JB Weld job. CB750K2
« Reply #8 on: December 16, 2016, 02:22:54 PM »
 Early cases have factory epoxy plugs in them.  This may be another one.
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Offline Terry in Australia

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Re: P.O. JB Weld job. CB750K2
« Reply #9 on: December 16, 2016, 03:41:40 PM »
How early Don? I bought that 69 K0 earlier this year and haven't had time to look at it until now (first day of my month long annual leave) so I'm keen to see what I've got! ;D
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Online Don R

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Re: P.O. JB Weld job. CB750K2
« Reply #10 on: December 16, 2016, 07:32:01 PM »
 My sandcast has epoxy in the case, I freaked out, but was told they all do. This was on the right side down low under the points. I honestly haven't checked where yours is.
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Offline TinyHouseYugeGarage

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Re: P.O. JB Weld job. CB750K2
« Reply #11 on: December 16, 2016, 07:43:16 PM »
Thanks for all the info guys. I was panicked when I first noticed this, but now am breathing a sigh of relief. Still seems a little weird to me Honda plugged some holes with epoxy. They probably figured no one would notice as the evidence is burried in a nice thick layer of chain oil/grime a couple miles down the road from the dealership ;D
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1972 Honda CB750K2
1973 Honda CB350F
1966 Honda CL77 305 Scrambler
1965 Honda CB160
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