73' CB500 Restoration
Posted 11 April 2012 - 08:37 PM
There is not a lot wrong with this bike but there are a few things. Previous owner and friend said that there was an oil leak, didn't start, no head light, rusty gas tank, and frozen master cylinder for the front brake. So far I have found that the oil leak was caused by a dry o ring that was stuck to the case in the oil pump. I'm going to replace it but for now it is sealing after I oiled it up pretty good. Also going to replace the shift seal as it had a lot of grease and dirt packed around it. I got a head light from someone that didn't need theirs for 10 bucks and it works. The gas tank I cleaned out with "The Works" toilet bowl cleaner. The master cylinder is quite frozen so I just let it soak in a vinegar solution to see if it will eat some of the corrosion up.
As for the not starting problem I found that all of the connectors under the seat were very badly corroded, however the ones by the headlight look brand new. Pretty strange so I assume it was stored in a shed and the back end was closet to the door, but if not I haven't got a clue why. I hooked a battery up to see if I could get anything from the lights and the starter. Got absolutely nothing. So that's when I started looking at the connectors and testing with a meter. There was infinity resistance when the leads touched on opposite sides of the connector as illustrated in the following pictures.
I had started cleaning the leads but paused to show a picture to everyone. Here is a connector that I was talking about. By the way I fried that regulator but I will get to that in a second.
Only got a resistance out of the top right pin. I soaked it in a bag of vinegar and salt over night, brushed it with a nylon brush for about 45 seconds to remove the film, then with a brass brush for about 30 seconds and they look fine now. Not brand new but they have a resistance now.
Also after doing this to all of my connectors I was able to get the lights to come on, though the flasher relay must be burnt out as they didn't flash just stayed constant. I still am getting nothing from the starter motor but that is not the switches fault or the battery. I believe it will need to come out and be cleaned very well. I tried to "jump" it by placing a screw driver across the terminals of the starter switch and still got nothing. That is dangerous but I had to see. I do get spark when I kick it over though so I will make a temporary gas tank this weekend and see what I can do about starting the bike. I am very excited about it. I mentioned the headlight works too, I was surprised that all of my switches are still good. Most people complain that they rust apart on their bikes, mine seem great other than the master cylinder. Oh and I fried the regulator being an idiot. Forgot to disconnect the battery and let the positive lead make contact with the frame and the regulator and it started smoking. Really was kicking myself after that brilliant piece of work. Not only did I fry a probably decent piece of equipment I also could have seriously injured myself with a mistake like that. Good thing I always wear gloves I guess when working with this many amps, only takes 5 mA or .005 A to stop a heart.
So on the agenda for the weekend is try to start the bike, pull the starter motor out, finish up the gas tank if it starts and possibly line it with POR-15. The gas tank is clean of rust but I am not sure if I trust the Phosphoric Acid not to leave little flakes of phosphate in the fuel to clog my jets. Next week I also have a lot going on so might not get everything done that I want, should have an interview for an internship not that it has anything to do with the bike but oh well. I'm happy about it I'll get started on Friday after class and work and keep everyone posted. Do hope this side of the forum picks up though, these bikes are very cool.
Posted 12 April 2012 - 06:04 AM
Posted 12 April 2012 - 08:01 AM
I'd wait until you get a good deal, some people don't know what they have and just want it gone.
Posted 13 April 2012 - 05:54 PM
It smokes pretty good on the left side from cylinders 2 and 3 but that is alright. It is not blue, I do not know what is causing it but I will find out.
If anyone has any suggestions on how to solve the smoking just throw it up here. I'm open to any and all suggestions.
Edited by jostith, 13 April 2012 - 05:55 PM.
Posted 14 April 2012 - 10:14 PM
Did it sit for a while before you got it?
Are you making a cafe racer with it?
Posted 15 April 2012 - 08:24 AM
I am not making it into a cafe racer. I've got a buddy that is doing that with his CB350 he just stole. He got a running 74' (I think) CB350 that is orange and in great condition. The guy he got it from said that the motor was rebuilt but no fluids were ever put in it to see how it ran. He poured oil and gas in and fired it right up. He got it for $600. Mine was free but has taken some work, though not much money.
Posted 08 June 2012 - 06:57 AM
Posted 08 June 2012 - 08:37 AM
Thank GAWD! That crap is so played out now. And most of the time the person never finishes and winds up with just a ruined motorcycle.
Bike looks great, it sat similar amount of time mine did. Maybe a rich carb or ignition problem causing the smoke?
About your connectors, I use a flat jewelers file and gently file clean the spade connectors, then wash them out with WD and apply dielectric grease to the connection.
The front master cylinder on my Kaw was pretty nasty with crystalized fluid and junk. I just washed it out with brake clean and pumped new fluid in there. Been working ever since (knock on wood). "Do as I say, not as I do." haha
Edited by Jeekinz, 08 June 2012 - 08:38 AM.
Posted 11 June 2012 - 02:30 PM
As for the OSPHO gas tank treatment, it worked. But made me super nervous. I poured in some sea foam just let it sit there for a few days so that I could see if it would eat away at the stuff but it didn't. But there were some very small particles in the tank that made me too nervous. Figured some fuel filters would solve it but ended up going with this stuff.
Already threw in the paint remover and then the lacquer thinner to make sure that it is clean so when the stuff gets here just going right in. Supposed to be easier than POR-15 and seal up better too. Got a new petcock so as soon as it all gets here and it is sealed up going to get it riding this weekend.
The whole motivation was that I rode a buddies 350 that is 2 years newer I believe, it was amazing. Not even in as good a shape as mine but looked awesome and was a blast. So it is time. Not that I ever gave up but was taking a little break because of funds. Got a raise at work and threw the money at the bike I will soon be posting more frequently if there are still people interested in it.
Posted 11 June 2012 - 02:44 PM
Now this is what the cover looks like after sanding it down a bit. Took a long time but I think it looks decent.
Going to finish it up with 2000 grit to remove all the small scratches and they are very light, the flash just made them look worst.
Edited by jostith, 11 June 2012 - 02:47 PM.
Posted 11 June 2012 - 03:58 PM
Still interested, I'm still waiting for the right bike....I thought I had an 82 gs1100l but the guy wanted too much for a project bike.
Edited by skisnh, 11 June 2012 - 03:58 PM.
Posted 16 June 2012 - 01:36 PM
I got the petcock installed and going to do the gasket for the alternator next and then probably going to take a ride real quick. Not sure how smart it will be but oh well.
Posted 19 June 2012 - 06:12 PM
I pulled the starter motor and tore into it a bit. After doing some thinking I thought that maybe the cable in was fine, as I checked continuity and it was good, I thought maybe the other issue would be it making contact with the case. Turns out that was the case, no pun intended I sanded the outside to try and remove the slight oxidation and grit and it works great now.
It sounds a lot like a harley and still smokes and sputters so I am thinking that the timing is off. It is either one of two things I think, the timing is way off or the spark plug wires and boots are crap. Thinking it is the latter because when installing the new plugs number 3's wire came out of the boot. Most of the time that is a new set of coils as the wires are molded in. But some guys on the SOHC forum have found a couple ways to replace. The first is just get a splicer like the one made by NGK, bout 8 bucks a hit from bikebandit.com so that is 32 for my bike. Or another method is to cut into the coils and solder in new better wire, what I am leaning towards. Would like new coils anyway so if I mess it up then nothing lost, except about 20 bucks for the wire and new boots. Should be better wire than stock and also much better boots. Wish I could just pop on new boots but the wires are too short as is.
Posted 23 June 2012 - 07:11 PM
With the new regulator installed the smoke from the cylinders 1 & 3 had decreased a lot. I also found out just how dumb I am. For wanting to be an engineer you'd think I'd stop and think a bit more. Couldn't figure out why the bike wouldn't run without choke.... it was running without choke, had the lever positions confused as I hadn't looked it up ever and just assumed. I put everything back together today and got the lever positions where I want them. I ride this bike really far forward so the shifter is at a steep angle but the brake lever is awkward, going to look into that. Which brings me to my next comment. I rode it today. First time the bike has been on the road, other than in the back of a truck, in 26 years. It felt great but it was very dangerous. Doesn't have a front brake right now and the rear brakes are notorious for rotting and separating from the hub after a few years of sitting. Was cautious as I could be and it was fine, amazing really. Was all smiles as I tooled around my neighborhood, never going over 3k rpms. So much smoother and more comfortable than my dirt bike, but the dirt bike is easier for me to lean into corners on. After I get comfortable on this one it will be too, just not yet. Looked like a moron wearing my dirt bike helmet but it was safer than nothing. Need proper motorcycle riding equipment rather than my dirt bike gear.
Ordered a new UNI filter after I found one on Ebay. It was about 30 bucks compared to about 60 bucks for OEM. Going to order brake pads for the rear tonight as well. Tomorrow I'll try to unfreeze the master cylinder and check the caliper. Got a few ideas of what to do but not sure how it will go. It will need a rebuild on the master cylinder, probably the caliper. Then it is just bearings, grease, chain, and tires and I can ride it until winter. Then it gets torn down and completely overhauled and really restored.
Got some new pictures of it for now.
Edited by jostith, 23 June 2012 - 07:13 PM.
Posted 29 June 2012 - 10:23 AM
Posted 29 June 2012 - 10:59 AM
You going to use K&N pods? You will need to re-jet.....some people dont like the pods if they ride in the rain.
Posted 29 June 2012 - 06:33 PM
Posted 29 June 2012 - 07:26 PM
There are 4 filter kits but they are not cheap, round $100 or so on ebay, you will need to make the bracket yourself though but they need to be supported or your carbs will fall and I've heard of cracking bowls from them swinging down.
Join SOHC.net, they have a ton of info and a lot more technical info than this site when it comes to the vintage stuff. Been amazing for my build. But unless you plan on a cafe racer there really is no point in pods, I do have a friend that runs them inside an airbox on his 350. Very strange, he bought it that way and it is only two cylinder but still odd.