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What are the symptoms of failing power valves and reed valves on a 1200gpr?
I currently have the #2 cylinder not firing, it has spark but no fire. When the ski had power it use to have a very distinctive sound, a very high pitched buzz. The engine has 100 hrs on it, its premixed, and "d" plate installed. Any advise on where I should start? any help is greatly appreciated.
 

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Start with a compression check on all cylinders. A complete Power Valve failure will result in damage to the piston/cylinder and you will have to replace it. If you are seeing a compression drop on that cylinder then plan on pulling the engine and replacing that cylinder as a minimum. Sometimes metal falls down into the engine and does more damage, so a bad piston/cylinder could be the least of the problems.
 
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