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thanks to all who offered advise regarding my over heating alarm going off over 4000 rpm
after having the water pump ,thermostat, popet and replaced , the final cause was a corrosion hole in the top cyclinder just under the spark plug area (which was by the pocket for the sensor).this was found after I had removed the head and exaust plates and cleaned out the salt deposits in the block etc using a mild acid solution .The salt in the head was removed an the cause was found. this was not fixed as I did not see the extent of the damage so I reassembled the motor, fitted new head gasket etc and went fishing and the bloody horn still went off.
I removed the thremostat and problem when away.
But I was not happy so I removed the head and was trying to find what was the cause when an old mate of mine picked up the head and pointed the hole out.I have had it resin filled with a pratley system resin ,used in car heads and so far so good. hoping this might be of some use to other yam 90 owners
after having the water pump ,thermostat, popet and replaced , the final cause was a corrosion hole in the top cyclinder just under the spark plug area (which was by the pocket for the sensor).this was found after I had removed the head and exaust plates and cleaned out the salt deposits in the block etc using a mild acid solution .The salt in the head was removed an the cause was found. this was not fixed as I did not see the extent of the damage so I reassembled the motor, fitted new head gasket etc and went fishing and the bloody horn still went off.
I removed the thremostat and problem when away.
But I was not happy so I removed the head and was trying to find what was the cause when an old mate of mine picked up the head and pointed the hole out.I have had it resin filled with a pratley system resin ,used in car heads and so far so good. hoping this might be of some use to other yam 90 owners
!
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