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1992 Yamaha 40 HEO - cricket sound above 2500 rpm

Sounds like an ignition miss.---------------Use a timing light to see which cylinder.--------Do a compression test also.
 
thanks,
also is it normal that sparks goes every couple of months?
I changed them twice a year, old ones looks good but engine runs rough
 
Many good sparkplugs are thrown away !!----------Not much goes wrong with the plugs.----------------I suggest you do a compression test.---------Then test that spark will jump a gap of 3/8" or 1 cm with ease.-------------That will help you determine where the problems might be.---------------Trouble shooting does not cost $$ , it just saves you $$$
 
compression is good and tested, official mechanic for Yamaha has tested boat and for him engine si fine
he also said that this engine is not favorizing low rpms, and last time I did run it pretty low for fishing, after that it chokes and coughs a bit
 
????----------Please read post # 4 again and report actual results of the tests.----------That motor should idle at low rpm all day long.----------Something is wrong with the motor and it should be easy to determine what is wrong !!!!
 
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