the electrolysis part is not rocket science.  More like freshmen chemistry class.

Using 12VDC, positive to the material that you want to coat (spoke, etc) and negative to type of material that you want to add to the base.

I use electrolysis to clean metal parts.  It removes rust and does not remove the base metal like blasting does.

Pending Sale. 

I recently had these on craigslist with the matching head.  I ended up seperating the auction and sold the head to KP.

These came with a chopper project.  When I originally built the chopper I was not aware that the top end was a sandcast.  The case was a replacement case.  This includes a chain tensioner and the rubber chain track thing.  I am not 100% certain that the tensioner is sandcast or not.  

About this part!!!  
The lower left thread that holds on the tensioner was retapped to 7mmx1 from the standard 6mm thread.  The hole for the tensioner was also slightly drilled out to accomadate the 7mm bolt.  
The bolt that holds the tensioner pin was also replaced with a 1/4x20 or 28 (cant recall).  Point is that it is not a standard 6mm bolt either.
The pistions are not the best condition and have some pitting.  I was originally running this set until i stripped out the sparkplug hole on the matching set (this was previously sold to KP).  The rings have 3000 miles on them.  I originally honed the holes and put it to gether and it ran good.  I decided to remove these jugs when i swapped the head for a diecast.

My email is wbass77@gmail.com.

Here is a video that i tool earlier today. Its got the old tank while the new one is getting prepped for paint.

Welcome to the site. I see that you found it. Please tell everyone what you got. These guys can help you ID it.

I found him on a chopper site trying to find out what he has. I referred him here as you guys know better than anyone.

This is not easy to do without slipping the grinder into the housing. If its a sandcast housing, you want to especially careful. You can also use a drill and drill the head of the bolt off. If you get it centered and are carful, you are less likely to damage the housing cover. If you opt for the drill method, start with a smaller bit say 1/4 inch and work you way up. After you get the initial hole drilled thos step bits work well for something like this. I have done it this way and the grinding method mentioned above. If you use a grinder, i found that a dremel tool with a cutoff wheel worked well compared to a bulky 4.5" angle grinder. Both take effort and take time and caution to get them off.

There are also those bolt extraction tools that sears and other have. These were not available the last time i had to do it so that might be an option as well.

Keep up posted if you find an easier way. This is a common problem. When you replace your bolt, there is an aftermarket bolt that has a larger nut. Not advisiable for a 10 Pt sandcast restorer but a good option for a driver.

My question is are the other non 750 bikes like the 450 aslo sandcast? Are they as rare as the 750 stuff? I stumbled upon a 69 cb450 for cheap but I know nothing about these.

Joe,

Here is an O-ring post that I had on a different site. it has pics of the KO setup vs the later K's. Basically If i recall correctly, there is only a few small orings that you will need on the KO setup. There are some that are about 1/2 inch diameter on the main oil feed holes going up. These are the ones nearest the cam chain on the intake side of the engine. Then there are some small ones just under the cam tower where the jets are. As far as I know the only seals were on the oil feed side (feed side is pressurized from the pump). The remaining holes are drain holes back to the crank case. See post here

http://sohc750.yuku.com/topic/2000