Yamaha 40 hp 2 stroke 2000 year model

by Ryan
(Stateline Ms. USA)

Was running fine. Ran up river 5 miles. Started missing. Like you flipped a switch. I switched it off and floated for about 20 minutes cranked up and ran fine all the way back. I go back that evening and ran fine for 20 minutes then like you flipped a switch started missing. It’s missing on cylinders 1&3. I changed plugs coils and cdi. Same problem. I can spray gas in throats of carbs and no difference. Any help would be appreciated. My email address is bradleyer@tds.net

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