Proper Timing chain alignment.

[motoman]

Yes.That could be the case. I have not checked the oil level or smelled for gas in the crankcase. Its a little awkward with one person and right now I'm on vacation. We thought about the rings washing out.But never expected it could happen. My thoughts were if the floats stuck open, wouldn't you have fuel on the floor from it running out the back of the carb?? I'll check that when I get back. Maybe we could drop a small amount of oil down the plug hole and see what happens.

Not if bike is on centerstand. Bike on centerstand allows it to tip forward a bit, causing fuel to run forward, thru combustion chamber, and past rings into crankcase. A 2"x4" under front wheel when on centerstand keeps motor/carbs level.

[ViperRon]

Bent Valve situation................................ Getting bent valves in an engine is easy......First many who come on here looking for help have a bike they do not know the history or condition of. Its easy to buy one the valves are bent in. Just letting a head drop on a table with cams in just a slight bit can bend them. If timing is out and the engine is rotated it can bend them does not take much.................Second if a bike has set you do not know the situation it sat in. Moisture can be terrible if it gets into an open cylinder. The spring is the only force to close a valve and will not if the guide is tight and a film of rust is on the valve stem. The piston will slap it shut but more than likely bend it..........Crap gets into cylinders and over time carbon can swell with moisture and rust, get a lump under one side and the valve will not close. However the piston slaps it shut but bends the valve.

Along with bent valves rust can do terrible things to cylinders that set. It does not take much rust on the gasket ring to start a bad process. Maybe the gasket holds at first but with heat and fire that rust or corrosion can act as a catalyst to help the heat eat right threw the compression ring on some gaskets. So now there is a blown head gasket and no compression.


So nothing replaces luck in rotating over an engine that has set a long time especially if in an unknown environment. To increase luck I always remove plugs blast some type of liquid wrench or PB blaster in cylinders give it time to react take the valve cover off and hand rotate the engine so I can see what I feel. That way you can see the valves move and feel any pressure or bind and as soon as it get to alignment point I can verify how its been run.

[XJ Rob]

Three bent valves does not account for the 4th cylinder with no compression. You may want to consider having that head repaired at a machine shop. Before I started tearing it down, I would want to know exactly the cause of the problem.

I think originally when we checked compression the rings were washed out. I didnt think about putting a few drops of oil in each cylinder to see if it came up. I just assumed there were other issues.

This is what I think happened....
While I was on vacation, I spoke to my dad and I mentioned to him about putting oil in each cylinder when I got back home. I told him maybe the rings were washed. WELL..... He decided to do it before I came home. I think he may have put TOO much oil in the cylinders and tried to start it. He said the motor just stopped turning over. After a few times of trying to start and it stopped turning over he gave up and walked away.
I asked him how much oil he put in the cylinders and he indicated 1/8 to 1/4" on top of the piston. I told him it only needed a teaspoon.
Number 2 had 60psi BUT that was with 2 plugs still in. It was just a quick check.

SO, My conclusion is that the rings were washed out causing no compression to begin with. Too much oil put in the cylinders caused the motor to "Liquid lock" bending the valves. Regardless of WHY the valves bent the first thing that has to happen now is replacing/repairing the head.

Just a foot note... This bike does NOT have a center stand. The 4into1 aftermarket exhaust prevents it.
He did say something about selling it for a parts bike while I was leaving his house today. I guess we'll see what happens.

[ViperRon]

Liquid lock will not bend valves however rust on valve stems is a good bet as they will rust long before the rings have an issue. At the angle valves move in these bikes they not only can hit pistons but each other. Also it can bend first time rotate and go down further bend again and then lock the piston or knock a hole in it.