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I've dealt with an 1100 that had similar problems. Water had gotten into the left two cylinders and caused a fair amount of rust and corrosion. I polished it out with fine wet/dry sand paper and reassembled the engine. It ran, smoked a bit at first but I think that was mostly old oil in the mufflers because the smoking cleared up after a bit of riding. Later on I checked the compression and found all four cylinders around 165psi a maximum of two or three psi differences. I don't like the idea of pitting in the cylinders but if it's only in one area and not too deep it probably won't hurt it much. The only way you can find out is to put it back together and try it.
One thing to be careful with is to check the valves to make sure there's no serious rust on the stems. It would be a good idea to remove the valves and clean any crud off them as well as lubricating the guides. Some engines that have been allowed to corrode in the cylinders also have rust on the valve stems which can cause a valve to stick open. This is not a good thing on an interference engine.
 

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I've had both good and bad luck with aftermarket head gaskets. The problem is that they are not all the same depending on who made them. I've not had a problem with OEM gaskets. In my opinion, for what it's worth, is that the critical part of changing head gaskets is first cleaning the mating surfaces of the head and case of old gasket material without marring the surfaces. Next is cleaning the threads of the head bolts and lubricating the threads and under the bolt heads with MOLY PASTE, not moly grease or any of the cheaper stuff. The last thing is to bolt up the head with a torque wrench using the specified pattern and bringing the torque up in three steps, a bit at a time. I like to re-check the torque on the bolts once more when I've run the engine a few hours because the heat/cool cycle tends to compress the gasket a bit more sometimes. I think this is specially important with aftermarket gaskets. Be careful when installing the head gaskets because they can be reversed, ie, flipped left to right so the rear end of the gasket is toward the front of the bike and vice versa. If you get it on backwards, at least on the 1100s, not sure about the 1200, you'll get a major oil leak. It's because the gasket isn't symmetrical down by the small bolt at the bottom center of the head.
 
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