Hello,I picked up a 1988 GL1500 last week to use the drivetrain on a Morgan style 3 wheel car. I got the bike home without testing it being it was a reasonable deal and i trusted the guy. I ended up finding two cylinder slam full of water and it was hydro locked. slightly rusty water came out of those cylinders and and I figured they would be in really bad shape. Upon doing a complete compression test I found that all cylinders were around 170 and the two that had water in them were around 150...So knowing this should be enough compression to test run the engine It actually fired up pretty easy and honestly ran pretty nice with a good idle and revved out clean. I then checked the oil again and saw that it was a milkshake. I figured let me change the oil and see how bad its mixing water and oil...It is pretty bad but non of the cylinders have gotten water in them again so I am thinking its not a head gasket but more likely the water pump as the oil is once again getting milky. I did another compression test after running the engine for a short time and was surprised to see those two low cylinders up to almost 165psi so I figured they are going to be fine...Well the bike has sat for a week and I went to start it up to get the oil warmed before draining it again. The bike would not start only spit and sputtered and backfired a few times. I figured maybe some plugs were bad so I checked them all and all had good spark. I figured I would do another compression test and did not like what I found. I have two cylinders the front cylinder on the right side and the middle cylinder on the left side are DEAD as in ZERO compression. I watched to see if there was even a piston coming up and down and yes there is so no broken rods or anything. I then removed the valve covers and watched the cams rotate and valves operate and nothing seems stuck or anything. I did another compression test and had almost 60psi and then all of the sudden it vanished back to zero. What is going on here? The bike had fantastic compression and has only been run momentarily for testing and now two cylinders have nothing. I see there is no valve adjustment so i assume it can not be a tight valve staying open. I do have a bore scope if I can find it and I will try to look in the cylinder but something would have to be bad wrong to get a zero compression reading. Anyone heard of anything like this before? BTW the bike only has 62K on it but clearly was left outside for the last part of its life and I think that is how two cylinders got water in them in the first place.
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