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Looks like you are going to need at least that idler, possibly a valve job as well.
What did the cylinders walls look like before you hosed them down with PB? Clean rusted? PB will did the trick, some guys like a mix of acetone and ATF or some oil that is very thin. Light tapping with a wood block on the tops of the pistons, just enough to create vibration will crack rust and let the PB get down further. BEATING them out is always a last resort.
What's the bottom half look like? Water in oil? Any oil at all?
There was oil and no water. If there was it was nominal.
The pistons are seized at about the same level, which was odd to me.
I was doing some reading at the shop yesterday and read that I should hammer a piece of copper super flat then work it in gingerly around the piston to get some of the rust out of the way so the pb could work
Put a mix of gasoline and diesel in each cylinder and light it on fire. Let it burn out (might take a while) and and wait a while. The heat cycling from the heating and cooling will break the pistons loose from the cylinder walls.
Swan came up with a good way to remove the stuck piston in his BSA Gold Star, much like Sonreir's, only with gas and ATF, the theory being the ATF can seep past the rings as the burning fuel expands the bore:
I did the same with my 450, diesel and ATF about 3 times. The last time I got all of the oil out out and filled that cylinder full of ice water just to make damn sure it cracked which it did.
Still had to drive it out but it wouldn't budge the first time.
I may have one of those cam chain guides. When I was rebuilding my engine I bought an extra cylinder head just to get the cam followers from it so I have some extra parts. I will look when I get home from work.
Flug: That sounds great. I would not mind getting that from you. I was just gonna weld it back. I had to cut the cam chain off. I couldnt get to the master link
So I took you guys advice:
I did gas and mystery oil about 10 minutes in each cylinder. While each cylinder worked I hammered the opposite piston with a wooden dowel. In a photo you will see how I did it. I had to use some welding wire and the dowel. I have one hand so I needed some way to hold it.
After burning, I hammered a little but put more oil in and hoping it will help more tomorrow.
I hope that loosens them up for you - I'm just having a beavis and butthead moment looking at your fire pictures.
I'm not sure if anything interchanges off a '72 CB350, but if so, I have a bunch of motor parts (starter, clutch assembly, motor bottom end) that I'm trying to get rid of.
You could split the case to see - I'm not sure if you had planned on going that deep into the thing. I think it would make more sense to try and break the pistons loose with the case intact, because it's going to be a pain to have to put everything back together to put an impact or breaker bar on the clutch to move the pistons.
If one of your rods is now pieces, then when you break the other piston loose the jugs should be able to come off. You'll know real quick then when one piston moves and the other doesn't
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