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Scott I had trouble with a brand new 40HP Yamaha caused by the ethanol mix fuel we switched to here in California back in 2005. It seems the ethanol absorbs some extra moisture and it in turn causes some minor corrison in the carbs which is seen as a white snottlike substance or when dry, a white powder it clogs the crap out of the low end jets.
I was told by Yamaha to do the water fuel seperating filter with a ten micron element and switch to an enzyme based fuel stabilizer.
In my case all I could find was some stuff called Star Tron for Diesel fuel, I started using it at the rate of one oz per ten gallons of fuel as well as Ring Free Decarbonizer at the same doseage (Sea Foam works great too).
The reason I use the decarbonizer is we troll for salmon here and it's a lot of low rpm time (11-1200rpm) on the engine and with the cold water we are operating in it tends to load them up as the engine is not heating up to a proper operating temprature.
Bottom line I have not had a lick of trouble since I started using the stuff, have a check done to the carbs and see if there's white crap in them and if so try using Star Tron, it might help.
I swear by the stuff although it won't regrow hair or cure a rainny day I sure like what it does to my motor.
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