Author Topic: 1973 CB500 MaS  (Read 9536 times)

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Offline Tete

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1973 CB500 MaS
« on: May 25, 2011, 08:33:52 PM »
UPDATED: 5/30/2011

After the repairs here is where we are at. stock as ever.








Well I bought her for what I figured was a decent number considering the condition of the bike overall. Not perfect but in very good condition cosmetically.  The bike did come in a basket, at least the carbs did.  In about 1000 different pieces and difficult to track what was and what wasn't missing. what went with what and considering I had never rebuilt a set of carbs completely and specifically a  CB500 FOUR I knew I was in for a bit of work, at least to get it rollin.

this is what I got

These are the carbs

and this  :-\

so I figured the best way to go about this is to get another set of carbs. Certainly there were many options.  Ebay had people charging and anywhere from $40 a set to $449.99 for a completely rebuilt and painted set.  Which was the better buy? The ones in your budget. In my case I made a trip to motorcycle heaven.  A place called Bobs Used motorcycle parts. Amazing place.  I walked in and went straight to the yard. 

This is such a small fraction of what they have there. Honda after Honda after Honda. 
Well, after some searching I found a Cb500K2 with carbs just sitting there in the sun.  Perfect.  everything looked to move freely and now I just needed to get them off the bike.  I proceeded to go back indoors to tell the gentlemen working that I wanted them.  He said $40 bucks!! there your's! ON my way to the bike with one of the yard men to pull the carbs off, the guy told me there is a trailer in the back with thousands of these in there.  he said there would be a much better set in there.  He pointed to a trailer with a sign that said, no trespassing, beware of bees.  Sure enough i walk right pass it and into the trailer.  It was like a scene from terminator.  I'm walking on hundred probably thousand of carbs.  No joke.  but after about an hour of searching I found a VERY clean set of 627B's.  Super clean. 


As I proceeded to inspect the new carbs they honestly look clean enough to put on the bike.  no joke. however being a noob to carbs and thinking, " do I really want to go thru this again", I opted for a rebuild kit from Keyster.  but first I inspected everything. Most of the carbs looked good when opened except one carb had like an alkaline deposit of something in it.  There was no gelled gas or anything, just a white powder in one carb. there rest however was very clean
White stuff. 

So I soaked the new carbs in simple green like many have done here and cleaned them up

When done I installed the bits and pieces.  Keep In mind I HAVE NEVER DONE THIS BEFORE SO FOR YOU NOOBIES IT IS WAY EASY, DON"T BE AFRAID!!!! if you can put together lego's then you can do this.  Now for tuning I haven't got there yet. But installing jets and stuff is not worth 150$ or whatever people charge.  Unless its a member here, then it's worth it.  HA!  support the forums.

more importantly, I learned so much about how this stuff works which is priceless. 
getting the float bowl gasket on wasn't fun, and after many different ideas ( White grease, petroleum jelly, praying)  I went with what others suggested a tiny drop of super glue to hold them in place. This worked out and gave me a bit more confidence.  got the bowls on and off I went.
One thing to keep in mind also is to attached the fuel lines to the "T" fitting between the carbs 1/2 and 3/4 this will make your life easier as they are a #$%* to get on and off under any circumstances.
Finally back to the bike, I don't have alot of automotive tools so this was probably done with the minimum, and used the stock honda tool kit when possible. 



I put some gas in the tank and double checked all my hoses and sure enough, with a few cranks it started right up and purrrrrrred like a kitten. I didn't adjust the carbs or anything but it just idled. 

notes:  I checked the oil and put a new filter and battery in prior to start up,  I should have checked the plugs but in my excitement I forgot.  Regardless I got lucky and everything seemed good.  and being a little crazy i rode it 5 miles to work the last two days.  started up from cold easy and rode like a boss. 

This week end I have a few things to do, oil change, plugs and synced .  There is a leak coming from the shift lever, my understanding this is common and although time consuming, an easy fix I probably won't ride it much till taken care of.  Also my tach is jumping all over and I still want to do mods.  In the mean time I need to get it dialed in and synced and get this pesky leak taken care of.  I move fast so expect this project to move fairly quickly.  I did all the rebuild and install all in one day, for a noob I'll take that as good enough.

A couple things I learned so far:
Use this site when rebuilding carbs:
also that I don't believe i needed a complete carb rebuild, and oring kit would have been good enough in my opinion ( an opinion of a guy that has zero experience  ;D )
Don't be afraid to jump in as with the people on the forums and using the search engine, you can find everything


« Last Edit: May 30, 2011, 04:44:25 PM by Tete »
1973 Honda CB500Four
1975 CB200T

Offline chronic_rider_550

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Re: 1973 CB500 MaS
« Reply #1 on: May 25, 2011, 08:49:18 PM »
I wish I was in AZ cause that looks like heaven!
http://forums.sohc4.net/index.php?topic=67122.0

"Faster, faster, faster, until the thrill of speed overcomes the fear of death."  ~Hunter Thompson

A friend is someone who'll get out of bed at 2 am to drive his pickup to the middle of nowhere to get you when you're broken down.

Offline Greggo

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Re: 1973 CB500 MaS
« Reply #2 on: May 25, 2011, 08:54:07 PM »
Sweet find on the bike, and the carbs!  Have fun, that 500 looks much nicer than mine ;)

Offline mikieg

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Re: 1973 CB500 MaS
« Reply #3 on: May 25, 2011, 09:11:22 PM »
Bob's is an amazing place, I have a '72 CB500 and I got alot of my parts from Bob's.

Offline chronic_rider_550

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Re: 1973 CB500 MaS
« Reply #4 on: May 25, 2011, 09:27:24 PM »
Finally back to the bike, I don't have alot of automotive tools so this was probably done with the minimum, and used the stock honda tool kit when possible.

Ha man. I feel that. I only have a set of screw drivers, a set of sockets, and a wrench. You become creative when you want to do things and don't have the tools to do it.(or the money)









[/quote]
« Last Edit: May 25, 2011, 09:33:04 PM by chronic_rider_550 »
http://forums.sohc4.net/index.php?topic=67122.0

"Faster, faster, faster, until the thrill of speed overcomes the fear of death."  ~Hunter Thompson

A friend is someone who'll get out of bed at 2 am to drive his pickup to the middle of nowhere to get you when you're broken down.

Offline Tete

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Re: 1973 CB500 MaS
« Reply #5 on: May 25, 2011, 10:47:22 PM »
yeah, its been fun.  this is not my first bike but my 3rd in 3 months  ::). But most o fthem have been running fine so I only did cosmetics stuff to them.  Also last year I had a BMW R65 1981 and the year before that 1977 Yamaha Xs400.  all great bikes. 

as for the shift lever seal change, anyone have experience with this? Also, is there anything else I a should change while down there?
   
Im looking to go with a Brat/Decafe/ theme with the bike.  so lower bars, firestones, flat seat, and then a few cosmetic goodies, if I end up with clip ons then I'll do rearsets otherwise, i won't.

« Last Edit: May 26, 2011, 12:29:20 AM by Tete »
1973 Honda CB500Four
1975 CB200T

maduncle

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Re: 1973 CB500 MaS
« Reply #6 on: May 26, 2011, 02:48:55 AM »

Makes me want to go out and get a set of carbs and rebuild them just for the sheer hell of it!

Great bike you got yourself there - I like the 'decaf' idea.

Offline Tete

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1973 CB500 MaS
« Reply #7 on: May 26, 2011, 08:05:51 PM »
Ok. So i got my little o ring gasket slash seal whatever abd have run into a couple of problem. The biggest being a stripped screw,

The location sucks as it is in the lwft cover in the corner. Very hard to acces with say a chisel and dremel. Any suggestions?  Also do i just keep unscrewing here with the lower most screw to remove the clutch cable?
« Last Edit: May 26, 2011, 08:10:20 PM by Tete »
1973 Honda CB500Four
1975 CB200T

Offline Greggo

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Re: 1973 CB500 MaS
« Reply #8 on: May 26, 2011, 08:41:41 PM »
If you're just trying to remove the cover, you needn't unscrew that clutch cable adjuster, as once you unhook the end of the cable attached to the clutch lifter, the cable slides right out of that slot.

Regarding the stripped screw, maybe use a chisel of some sort to punch a slot for a flathead impact driver.  Are you heating/soaking the screw?

Offline Tete

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1973 CB500 MaS
« Reply #9 on: May 26, 2011, 09:15:48 PM »
Done
1973 Honda CB500Four
1975 CB200T

Offline Tete

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1973 CB500 MaS
« Reply #10 on: May 26, 2011, 09:25:16 PM »
If you're just trying to remove the cover, you needn't unscrew that clutch cable adjuster, as once you unhook the end of the cable attached to the clutch lifter, the cable slides right out of that slot.

Regarding the stripped screw, maybe use a chisel of some sort to punch a slot for a flathead impact driver.  Are you heating/soaking the screw?

When u say clutch lifter what exactly do you mean? The lever itself. Unhook it there?

Thanks again
1973 Honda CB500Four
1975 CB200T

Offline Greggo

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Re: 1973 CB500 MaS
« Reply #11 on: May 26, 2011, 09:26:34 PM »
Nice.

Offline Greggo

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Re: 1973 CB500 MaS
« Reply #12 on: May 26, 2011, 09:29:12 PM »
If you're just trying to remove the cover, you needn't unscrew that clutch cable adjuster, as once you unhook the end of the cable attached to the clutch lifter, the cable slides right out of that slot.

Regarding the stripped screw, maybe use a chisel of some sort to punch a slot for a flathead impact driver.  Are you heating/soaking the screw?

When u say clutch lifter what exactly do you mean? The lever itself. Unhook it there?

Thanks again

Inside of that sprocket cover is the clutch lifter assembly.  Once you get the cover off, you'll see exactly what I'm talking about.  You can't remove the clutch cable without removing that whole sprocket cover.  Check out this link: http://forums.sohc4.net/index.php?topic=14273.0
« Last Edit: May 26, 2011, 09:30:43 PM by Greggo »

Offline Tete

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1973 CB500 MaS
« Reply #13 on: May 27, 2011, 04:11:34 PM »
Ok. So im finally inside this left engine cover after dealing with the stripped screw etc.
Also it looks like the leak is actually coming from here which is a
Hole below the shift shaft.

After cleaning the shift shaft seal it actually seems ok but i might as well change it since im here, right? If anyone has more info on this hole that would be great as well. I believe one of the stripped screws was in it however it was not the more difficult of the two to get off.
« Last Edit: May 27, 2011, 05:18:56 PM by Tete »
1973 Honda CB500Four
1975 CB200T

Offline Greggo

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Re: 1973 CB500 MaS
« Reply #14 on: May 27, 2011, 05:04:00 PM »




That crescent piece (#6) is locked in place by part 12.  It locks the adjuster cup (#5) in place when you're done adjusting. 

How bad is the leak?

Offline mjstone

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Re: 1973 CB500 MaS
« Reply #15 on: May 27, 2011, 05:06:01 PM »
Nice bike, Tete!  You definitely found the right place on the internet for these bikes.  Wish I had a bike boneyard around here to visit.  I'd probably bring home enough stuff to build a bike!  Keep plugging away, your doing good.  Don't sweat a couple of minor leaks.  Get it running good and ride it for a while.  I wouldn't change anything on the bike until you get used to how a SOHC/4 runs.

MJ
1972 CB500Four (Honda)
1973 CB500Four (Oliver)

Offline Tete

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1973 CB500 MaS
« Reply #16 on: May 27, 2011, 05:20:53 PM »



How bad is the leak?

Pretty bad. I mean as long as there is no screw in the hole oil will come out.  Slowly but surely.

The leak is coming from the lower right engine cover pan head screw. I believe # 13 in the diagram above
« Last Edit: May 27, 2011, 05:24:29 PM by Tete »
1973 Honda CB500Four
1975 CB200T

Offline Tete

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1973 CB500 MaS
« Reply #17 on: May 27, 2011, 06:45:29 PM »
Ok so i got this seal out. It sucked and used a blow dryer to heat it up then a screw tap method. much more difficult than expected. Also its a difficukt area to clean making it all that more fun.

One question. Do i put the new seal in dry? Or lube it w something?
« Last Edit: May 27, 2011, 07:06:43 PM by Tete »
1973 Honda CB500Four
1975 CB200T

Offline Tete

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1973 CB500 MaS
« Reply #18 on: May 27, 2011, 08:13:46 PM »
Anyone? Please. As i would like to close this up.
1973 Honda CB500Four
1975 CB200T

Offline Greggo

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Re: 1973 CB500 MaS
« Reply #19 on: May 27, 2011, 10:09:50 PM »
If it were me, I'd lube it with a dab of oil.

Offline Tete

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1973 CB500 MaS
« Reply #20 on: May 28, 2011, 01:41:32 AM »
Thanks for the advice again. Anyone have any idea why oil comes from thw hole below the shift shaft. The one the pan head screw came out of? This is concerning however i plan on getting some new screws tomorrow and draining the pan and reinstalling with some sealant on the threads. I hope this solves all my leaking woes. And gets me back on the road.
1973 Honda CB500Four
1975 CB200T

Offline Greggo

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Re: 1973 CB500 MaS
« Reply #21 on: May 28, 2011, 10:31:58 AM »
Thanks for the advice again. Anyone have any idea why oil comes from thw hole below the shift shaft. The one the pan head screw came out of? This is concerning however i plan on getting some new screws tomorrow and draining the pan and reinstalling with some sealant on the threads. I hope this solves all my leaking woes. And gets me back on the road.

Don't use gasket sealer, or anything of the like where it can get into the oil supply.  Chunks can break off and cause havoc in the oil pathways, and lead to top end oil starvation.  I don't know how bad your leak is, but, um...these bikes leak a little bit of oil.  You may be cleaning up 35+ years of gunk/chain lube, causing you to think the leak's worse than it is.  Like I said, I don't know how bad your leak is.

Offline Tete

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Re: 1973 CB500 MaS
« Reply #22 on: May 28, 2011, 02:47:15 PM »
Alright! so I got the bike back together after making a trip to the Scrap yard to get some new pan head screws, I also decided change the oil and filter as well as install the new shift shaft seal. 

The oil change was straight forward and the oil filter was a breeze, however, I have one question, why is it that on other threads people mention a washer with the filter when all I received was the Big O-ring for the housing and a little O-ring which I didnt use.  The filter I took off had no washer and the new filter  looked like it could be put in any direction just make sure the spring is in between the filter and the housing. 

One of the bolts I replaced was  different than that from the bike at the junk yard.  the one I took out of my bike was threaded up until few mm where is was flattened,   but upon close inspection it looked stripped.   I used the new one which was just a bit shorter to omit that flattend stripped end which was not going in under any circumstances.  picture to follow. perhaps I am wrong in doing so but so far so good and the bike is not leaking at all and running fine.
« Last Edit: May 28, 2011, 02:49:54 PM by Tete »
1973 Honda CB500Four
1975 CB200T

Offline Tete

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1973 CB500 MaS
« Reply #23 on: May 28, 2011, 02:52:29 PM »


Here she is.
1973 Honda CB500Four
1975 CB200T

Offline Greggo

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Re: 1973 CB500 MaS
« Reply #24 on: May 28, 2011, 07:59:45 PM »
Don't worry about the washer.  It was probably thrown away by accident by a PO.