Author Topic: '71 CB500 Four Scrambler  (Read 24207 times)

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Offline DurangoCB

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Re: '71 CB500 Four Scrambler
« Reply #125 on: May 12, 2018, 04:32:33 PM »
Ahhhh... summertime.  Hope everyone is enjoying it so far. 

I figured that the damaged left-side stop tab on the lower triple clamps (my fix in the first photo) probably meant I would find some body filler in the right-side of the tank.  And sure enough. 

Any advice for removing the old Bondo and repairing the dent from bare metal?  Tools and materials that are ideal? 
1971 CB500 Four- current project http://forums.sohc4.net/index.php/topic,170622.0.html
1978 CX500- next in line

Offline DurangoCB

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Re: '71 CB500 Four Scrambler
« Reply #126 on: May 12, 2018, 06:35:36 PM »
Grind out the filler with an air-driven angle grinder and a red scotchbrite pad. Then assess the dent. Probably best to see a PDR (Paintless Dent Removal) specialist to straighten the tank.

Thanks and done.  Your thoughts? 
1971 CB500 Four- current project http://forums.sohc4.net/index.php/topic,170622.0.html
1978 CX500- next in line

Offline DurangoCB

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Re: '71 CB500 Four Scrambler
« Reply #127 on: May 14, 2018, 04:41:23 PM »
Thanks again, cal.  It's pretty impressive what you guys can do to straighten out tanks.  I reached out to a local PDR guy who said he would "give it a shot" and it would be $150.  I need someone with more confidence than that.  That sounded like a potential rabbit hole of both time and money. 

I was able to make my own tool with a 1/2" mild steel rod and got the dent to pop out about halfway, then used body filler to get where I needed it to be. 
1971 CB500 Four- current project http://forums.sohc4.net/index.php/topic,170622.0.html
1978 CX500- next in line

Offline DurangoCB

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Re: '71 CB500 Four Scrambler
« Reply #128 on: May 14, 2018, 04:56:28 PM »
d1rtypelican, regarding our conversation via PMs, here are some photos of the subframe modifications for mounting the seat. 

(disclaimer: Calj called me on the quality of my welds, so be sure your welding skills are better than mine.)

If your bike indeed came with the same seat (eBay is flooded with them, so I believe it), it comes with a host of rubber bumpers, 4 bolts toward the rear, and two bolts at the front that hold a bracket they also include. 

I used the same principle for the bracket at the front but fabricated a new one that fit the bike better (pics when I get home from Moab).  I lost the rubber bumpers completely because they weren't even close to being a good fit for the CB500/550 frame.  And in the rear, I am using two of the four bolts and they fasten to the bracket I added.  Note that the bracket is arched, not flat. 

This seat is short, so be sure that's the look you're going for! 
1971 CB500 Four- current project http://forums.sohc4.net/index.php/topic,170622.0.html
1978 CX500- next in line

Offline DurangoCB

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Re: '71 CB500 Four Scrambler
« Reply #129 on: May 14, 2018, 05:11:11 PM »
Get the front bracket sussed out first, then fit up the arched bracket for the rear bolts.  The way the front bracket fits is going to determine the fore/aft position of your seat, which is of course what will determine the rear arch position. 

The front bracket placement is somewhat important if you're concerned with how well the front of the seat fits up with the tank, so get that where you want it first, then figure out the length of the seat hoop and the position of the arched bracket. 
1971 CB500 Four- current project http://forums.sohc4.net/index.php/topic,170622.0.html
1978 CX500- next in line

Offline DurangoCB

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Re: '71 CB500 Four Scrambler
« Reply #130 on: May 14, 2018, 08:46:41 PM »
Just to be clear... from the *inside* of the tank... work the dent from the *outside* of the dent (i.e. the perimeter of the dent) toward the center of the dent? 

The dent is so shallow that I'm not sure I can work it that precisely without a scope inside the tank.  Trick to that without a scope? 
1971 CB500 Four- current project http://forums.sohc4.net/index.php/topic,170622.0.html
1978 CX500- next in line

Offline DurangoCB

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Re: '71 CB500 Four Scrambler
« Reply #131 on: May 16, 2018, 09:57:39 PM »
Great info- makes sense.  Except I'm not sure I'm talented enough to feel out the dent from the inside with such precision without the use of a scope.  You PDR guys are impressive. 

I'm just a few days from sending the frame to paint and picking out my colors to shoot the tank soon. 

Then I'll dig into the engine and see what it needs in order to be strong for another 20,000 miles.  That makes me nervous but this entire project is about learning as much as possible and picking up as many new skills as possible.  An engine rebuild would be a rich source of learning. 


1971 CB500 Four- current project http://forums.sohc4.net/index.php/topic,170622.0.html
1978 CX500- next in line

Offline DurangoCB

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Re: '71 CB500 Four Scrambler
« Reply #132 on: May 26, 2018, 02:18:16 PM »
Thanks again, calj737.  You're a Motorcyclopedia. 

I am finally ready to take these bits down to talk to the powder coater and then start on the top end rebuild. 
1971 CB500 Four- current project http://forums.sohc4.net/index.php/topic,170622.0.html
1978 CX500- next in line

Offline Pin2Hot

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Re: '71 CB500 Four Scrambler
« Reply #133 on: May 29, 2018, 07:30:46 AM »
Ha funny how we're basically at the same place.  Lookin sharp, can't wait to see it nice and coated.

Offline DurangoCB

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Re: '71 CB500 Four Scrambler
« Reply #134 on: May 29, 2018, 10:34:08 AM »
Ha funny how we're basically at the same place.  Lookin sharp, can't wait to see it nice and coated.

I've been noticing that and keeping an eye on your build.  I visited the PC today, got a quote ($200-250 because I've done so much prep on everything already), chose my color and ordered the powder.  Drop it off later today and should have it back by Friday.  It's silly how pumped I am. 
1971 CB500 Four- current project http://forums.sohc4.net/index.php/topic,170622.0.html
1978 CX500- next in line

Offline Stev-o

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Re: '71 CB500 Four Scrambler
« Reply #135 on: May 29, 2018, 02:35:10 PM »

  You're a Motorcyclopedia.   

That word should go in the SOHC4 dikshunary!!

http://forums.sohc4.net/index.php/topic,84697.0.html
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline DurangoCB

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Re: '71 CB500 Four Scrambler
« Reply #136 on: June 08, 2018, 10:47:20 AM »
Back from getting a fresh coat of industrial grey.  Now to finish cleaning and painting the engine, so we can start putting it back together. 

1971 CB500 Four- current project http://forums.sohc4.net/index.php/topic,170622.0.html
1978 CX500- next in line

Offline DurangoCB

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Re: '71 CB500 Four Scrambler
« Reply #137 on: June 08, 2018, 11:55:06 AM »
Inside your frame (right side, where the upper motor hangar connects to the frame/engineneeds to be bare metal for the battery NEG connector to perform properly. The same is true on the motor, on the boss where the spacer contacts the motor. Both ends of the spacer need to be clean, bare metal.

You can apply a thin smear of dielectric grease on all those surfaces to prevent corrosion.

Right on.  There are actually a few places where I want to clean up the PC a bit.  I found it really tough to micro-manage the folks at the PC with regard to the masking. LOL They do MC frames regularly but naturally aren't as OCD as me. Overall their work was a 9/10- I'm pleased. 

Do you happen to know the easiest and most pro way of removing PC?  Clean lines etc. 
1971 CB500 Four- current project http://forums.sohc4.net/index.php/topic,170622.0.html
1978 CX500- next in line

Offline DurangoCB

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Re: '71 CB500 Four Scrambler
« Reply #138 on: June 08, 2018, 12:14:35 PM »
Sounds like others here have used Permatex Gasket Remover on a q-tip to remove small patches of PC. 

What about a ground spot at the coils? 
1971 CB500 Four- current project http://forums.sohc4.net/index.php/topic,170622.0.html
1978 CX500- next in line

Offline Scramps

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Re: '71 CB500 Four Scrambler
« Reply #139 on: June 08, 2018, 06:05:44 PM »
I just used a file, cleaned up okay

Offline Stev-o

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Re: '71 CB500 Four Scrambler
« Reply #140 on: June 09, 2018, 03:05:21 PM »
A Dremal tool easily grinds off PC with precise control.

Nothin' like fresh powder!    Looks good...
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline Scramps

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Re: '71 CB500 Four Scrambler
« Reply #141 on: June 09, 2018, 06:59:28 PM »
I love that color, it’s a fine choice

Offline Stev-o

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Re: '71 CB500 Four Scrambler
« Reply #142 on: June 11, 2018, 03:41:48 PM »
Hey Durango....are you ok as far as the wildfires up there?
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline DurangoCB

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Re: '71 CB500 Four Scrambler
« Reply #143 on: June 12, 2018, 11:44:35 AM »
Hey Durango....are you ok as far as the wildfires up there?

Yes, though it's a tough question to answer.  There was a mourning process and this sort of false hope that the fire would be put out quickly, but these conditions are unprecedented in SW Colorado and there was no stopping this fire.  That said, nobody has been injured and no structures have been lost and without knowing the exact topography and layout of the area that is burning you'll have to just trust me when I say that these firefighters and absolute fkn WIZARDS.  The response has been incredible.  A very successful firefighting effort.  So eventually you surrender to the inevitable and just enjoy the show... Mother Nature is putting on a show, as are the firefighting wizards.  (Which, I have to point out, is Socialism in action.)

But we are losing a huge portion of some spectacular, pristine old growth Ponderosa forest.  The fire was started by the coal-fired narrow gauge RR and given that there has always been a tug-o-war here between the sort of sedentary people (who ride the train and shop for souvenirs downtown and complain if they can't park ON the main drag or when the city spends money on bike lanes, etc.) and the active people (mountain bikers, hikers, river runners, who want the river trail and bike paths and trails), it sort of feels like the train having burned down the forest and ruined the trails has left us with heavily impacted outdoor recreation and virtually no impact on the shops and hotels downtown.  The couch potatoes win.  LOL

Anyway, all the evacs have gone smoothly.  No injuries, no deaths, no lost homes.  I just returned to work from a 2-week staycation so I've gotten a ton done on the CB500, plus a lot of riding both bikes and motos. 

1971 CB500 Four- current project http://forums.sohc4.net/index.php/topic,170622.0.html
1978 CX500- next in line

Offline DurangoCB

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Re: '71 CB500 Four Scrambler
« Reply #144 on: June 12, 2018, 11:51:05 AM »
Current Status:
 
Painting the engine and replacing shift shaft seal aka SSS
Replacing wheel bearings and polishing hubs
Rebuilding and repainting front caliper

This bike should start looking like an actual motorcycle again in the next week.

The final hurdle both in terms of $$$$ and knowledge is wiring the entire bike from scratch around an m.Unit.  I'm actually looking forward to that both in terms of learning (sorry in advance calj777) and because it seems like the clean portion of the rebuild. 

1971 CB500 Four- current project http://forums.sohc4.net/index.php/topic,170622.0.html
1978 CX500- next in line

Offline Scramps

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Re: '71 CB500 Four Scrambler
« Reply #145 on: June 12, 2018, 06:20:46 PM »
Glad to hear you're okay. Those pics of the smoke plume are pretty impressive!

Offline DurangoCB

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Re: '71 CB500 Four Scrambler
« Reply #146 on: June 25, 2018, 05:52:35 PM »
Glad to hear you're okay. Those pics of the smoke plume are pretty impressive!

Thanks for the comment.  If it weren't for you, I'd be replying to myself.  LOL

Engine painting and polishing happening now.  Ready to hoist this noise-maker into the frame. 
1971 CB500 Four- current project http://forums.sohc4.net/index.php/topic,170622.0.html
1978 CX500- next in line

Offline Scramps

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Re: '71 CB500 Four Scrambler
« Reply #147 on: June 25, 2018, 06:01:16 PM »
That’s a beauty of an engine!

These forums can be pretty quiet, I’ve noticed. It’s nice to get a little recognition from time to time, though.

What sort of stuff are you using to polish?

Offline mook32540

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Re: '71 CB500 Four Scrambler
« Reply #148 on: June 25, 2018, 06:18:54 PM »
I've been watching your build man. Just put mine into the frame this past weekend. I figured I'd start a build thread once it's all done. I also wondered how you got it all shined up. Looks nice.


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Offline DurangoCB

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Re: '71 CB500 Four Scrambler
« Reply #149 on: June 25, 2018, 06:23:00 PM »
That’s a beauty of an engine!

These forums can be pretty quiet, I’ve noticed. It’s nice to get a little recognition from time to time, though.

What sort of stuff are you using to polish?

Thanks!  Turned out nice and getting the engine really clean was less of a PITA than I expected.  (ScotchBrite pads, then soap and water, then acetone.)

I don't know if I'd call it recognition, but I get what you're saying.  Mostly I just want people who know more than me to let me know if I'm doing anything wrong, or just doing it the hard way!  I don't expect accolades for this build... it's my first and I'm not doing anything that hasn't been done before.  In fact, I made a point of copying a real builder as practice for my first build!  #ideathief

For polishing... 150 grit wet sand, then 320 grit, then 800 grit, then 1500 grit... then Mother's Aluminum polish with a cotton wheel on a drill.  I'm not going for a chrome/mirror finish, but if you wanted to, it's really all about the additional time on the last step with the Mother's.

Have fun, amigo! 
1971 CB500 Four- current project http://forums.sohc4.net/index.php/topic,170622.0.html
1978 CX500- next in line