Oxidation in CX650 Head

for those of you that have M.B.S. (multiple bike syndrome) and have the "silver wing" models.
as our sponsors also have supplies for those bikes and they are popular with the "wing" crowd.

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mytown
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Oxidation in CX650 Head

#1

Post by mytown »

I found this CX650 engine of unknown history and have been told that the oxidation that appears in the pictures would not be a problem if I cleaned it out. I'm seeking other opinions.
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There is no sign of oxidation in the other head. If I were to just clean it out, what would be the best way of doing so? Thanks.
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Re: Oxidation in CX650 Head

#2

Post by Gowing »

Clean as best you can and use. Are you going to pull apart and lap the valves and re valve stem seal it?
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salukispeed
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Re: Oxidation in CX650 Head

#3

Post by salukispeed »

You have a loaded question there. I am guesing the bike was left out side for a while and water got in the intake. I have seen worse run fine with no more than a little brushing to remove the loose fuzz and blow it out with air.
But It is also possible that some water got past the valves and the cylinder is just as rusty. Does it turn over easily and smoothly with the plugs out? If not the head might need to come off anyway. One more possibility is that the head gasket was the source for the moisture and it could use more in-depth look.
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Re: Oxidation in CX650 Head

#4

Post by fish »

Mytown I wanted to agree with salukispeedo
The bigger concern would be pitting & rust on the valve stem and any water that got down in to the cylinder.
The other thing to add is there might be no problem at all & we all are over reactiong.
If it was my project I would flood it goodly with MMO & pull the sparkplugs & put some MMO down there also.
Go ahead & do the other side also.
see if the engine turns over freely..
DO NOT USE THE STARTER to spin the engine.
Use a wrench & do it slowly.
If it seems to spin OK I would put the carbs on & run it
If is it froze up then you got some decisions to make.
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Re: Oxidation in CX650 Head

#5

Post by Missourimike »

Everyone posting has given good advice. If the exhaust was left open to atmosphere, I would presume that is where the moisture came from. I'd vacuum out any debris, with the valves closed. Blowing air into the chamber might force some particles to lodge between the piston and cylinder wall. Any good penetrating oil(not WD40) should be allowed to sit for awhile in the chamber. Then turn the engine over, with the spark plugs removed. Much easier to spin over. Once the motor is run for awhile, you will know whether or not it was a coolant leak that was the source of moisture. I'd not tear into anything until the facts warranted such work, unless you have lots of time and money to spend on a needless teardown.
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