KZ550A Block advice

Hey all,
I just got a 1980 KZ550 as my first project. Finally finished ripping it apart today and it turned out to be in overall better shape than I expected (It turned out to be full of water when I got it...). Unfortunately, though, the block is very rough. The 2 left cylinders can probably just be honed and will be ok, but the right 2, and especially cylinder 4, are extremely rusted. I'm trying to figure out what the best course of action would be. I'm a college student so I'm on a budget and trying to do everything as cheap as I can while still getting good enough results. My goal isn't anywhere near a full restoration. What would it likely cost to resleeve 2 cylinders? Could I just bore all 4 instead (I should probably get new pistons anyway)? I'd also be happy to buy a used block and hone it, but the problem is that it seems like every one I can find is for an LTD. Would that still be usable with a standard KZ550A?
Thanks guys!

Welcome to KZRider 
I moved your post to New Members as part of your introduction 
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Dave
 

When faced with a similar situation, I bought a clean used cylinder off eBay.  Hone, new rings, OEM gaskets, and the engine ran like a top.

Like I mentioned, all of the ones I can seem to find are LTD ones. Can I still one or are they different? The LTD is a larger displacement right?

I would expect the 550Ltd to be the same, certainly on the bigger bikes the differences are in cam spec and jetting (double check a FSM for bore and stroke specs for both and compare)

Agree with Wookie, LTD is the same.  Most likely the GPz engines are same as well, but the fin shape may be different.

They were all 553cc. Also, the LTD block was not painted from the factory.

Ok cool. So you think I’d have no issue running it then?

aarongold wrote:

Ok cool. So you think I’d have no issue running it then?

Should be fine

Someone on here asked a similar question a few weeks back. LA sleeve's are available but by the time you buy them, remove the old liners in a oven (all 4 drop out) cold press/bond all the 4 liners back in then bore/hone to size, it would cost considerably more than a used barrel. The other thing you have to consider when pressing liners in is sometimes the flanges sit proud of the barrel top requiring a skim job which is more money.

First thing I do when looking at something similar to that picture is mechanically de-rust those liners then measure the bores. Sometimes your beyond the service limit, if not then the liners can be honed.

I usually take mine to a local guy who has a honing machine (he will double check my rough measurement with a bore gauge) He will then do a light hone on each liner to see if there are any deep pits from the rust. When he does this light pass you can also see if the bores are straight. Sometimes with heavy rust pits a liner needs to be bored +.25 to 1mm over depending on how bad it is.

On one such barrel I had two bad ones like you, one needed +.25 and one +.75mm to clean up. I opted to go +1mm once I found a oversize piston kit, which took a bit of hunting.

He offer 1,00 and 3,00 mm over size piston kits.

www.scheuerlein-motorentechnik.de/motorr...99-ccm/z550-modelle/

You should be fine with any KZ550 block, but you may need the matching cam chain tensioner to go with it, as there have been a few different shapes for the gasket on those over the years. Ask me how I know.