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99 4 stroke locks up

P

Paul O'Meara

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"I have two 1999 Yamaha 9.9 4s

"I have two 1999 Yamaha 9.9 4strokes on a sailing cat. If left for more than a few days one will not rotate unless bumped on the starter a number of times, appears to be seized. I have tried it with the plugs out, and turning it by hand but no better. The engines have done less than 150hrs."
 
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