Author Topic: What's wrong with this picture?  (Read 1587 times)

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Offline eigenvector

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What's wrong with this picture?
« on: March 05, 2017, 08:18:51 PM »
https://seattle.craigslist.org/tac/mpo/6023064374.html

Okay, the obvious misaligned holes notwithstanding.  If you have an engine from 70 years ago, would you maybe take the extra step of making sure you're drilling the holes in the correct location?

Question, would you use those rods or did they ruin them?
Rob
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2018 HD Softail Heritage
1979 CB750K Limited Edition
1977 CB550K
1984 CB700SC Nighthawk
1983 VF750S Sabre

Offline FunJimmy

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Re: What's wrong with this picture?
« Reply #1 on: March 05, 2017, 08:50:35 PM »
Question is, "Why is a Knucklehead drilling lightening holes in parts for a Flathead?"
« Last Edit: March 06, 2017, 07:33:47 AM by FunJimmy »
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Offline Don R

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Re: What's wrong with this picture?
« Reply #2 on: March 05, 2017, 09:00:29 PM »
LOL.
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Offline 754

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Re: What's wrong with this picture?
« Reply #3 on: March 06, 2017, 12:16:22 AM »
Cheap for WR or K stuff..
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My next bike will be a ..ANFOB.....

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Offline eigenvector

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Re: What's wrong with this picture?
« Reply #4 on: March 06, 2017, 08:14:25 PM »
No doubt because of the "customization" done to the parts.

I suppose it could be fixed, this is just me tossing something out there - I don't know fill the holes in with a welder and grind the web flat again to balance it.  I don't know what they used for material back then.
Rob
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2018 HD Softail Heritage
1979 CB750K Limited Edition
1977 CB550K
1984 CB700SC Nighthawk
1983 VF750S Sabre

Offline 754

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Re: What's wrong with this picture?
« Reply #5 on: March 07, 2017, 12:02:44 AM »
Most of them seemed to have drilled rods..
Maker of the WELDLESS 750 Frame Kit
dodogas99@gmail.com
Kelowna B.C.       Canada

My next bike will be a ..ANFOB.....

It's All part of the ADVENTURE...

73 836cc.. Green, had it for 3 decades!!
Lost quite a few CB 750's along the way

Offline strynboen

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Re: What's wrong with this picture?
« Reply #6 on: March 07, 2017, 03:26:55 AM »
welding the holes vill stress the rod even more..looks like it have run fine as they are..are you in need for this parts?think the holes are almost, as old as the rods
« Last Edit: March 07, 2017, 03:28:27 AM by strynboen »
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Offline eigenvector

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Re: What's wrong with this picture?
« Reply #7 on: March 07, 2017, 08:01:49 PM »
I could argue that.  On the bottom rod the holes look pretty shiny - but maybe that's just a trick of the light.   :-\

As for the hole spacing - that top one is messed up bad.  The balance is all out of whack, the amount of holes have seriously compromised the web strength.  The web isn't there to fill a gap, it provides bending strength for the rod during the down stroke.

I poked around and you're correct that it is common for older Harleys to have their rods drilled for racing - maybe that's where this set originated from?
Rob
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2018 HD Softail Heritage
1979 CB750K Limited Edition
1977 CB550K
1984 CB700SC Nighthawk
1983 VF750S Sabre

Offline 754

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Re: What's wrong with this picture?
« Reply #8 on: March 07, 2017, 08:41:56 PM »
They are from a WR racer, but I agree the drilling is  bit screwed up
WR is pretty desireable, they were a 750 but not huge hp..or revs
One of the racers was referred to as a ball job..bearings rather than bushings on most if the shafts..higher HP...   I think that was the WLDR
 If you ever get to the AMCA meet in Tenino in August, you may see some of them bikes..
Maker of the WELDLESS 750 Frame Kit
dodogas99@gmail.com
Kelowna B.C.       Canada

My next bike will be a ..ANFOB.....

It's All part of the ADVENTURE...

73 836cc.. Green, had it for 3 decades!!
Lost quite a few CB 750's along the way