Actually 2, a F115 and a LF115. Both motors doing exactly the same thing. After a long storage, both motors were fouling plugs. To the point that they would start to miss after about 45 minutes of cruise running, 4000-4500 rpm's. If I clean the plugs they run again for same amount of time, clean, repeat. All 8 plugs black fouled, dry, no oil. I have changed one coil that was bad. I drained all gas from both separate tanks and filled with fresh. The only other thing I can think of is I had purchased aftermarket fuel injectors and maybe they are causing the issue. I have cleaned the old original fuel injectors and will try them next. I am getting 5800-6000 rpms wide open. So a little confused why they would run so rich. I read some about throttle position sensor and was wondering if that is readable with the Yamaha diagnostic software I have.
Any help would be certainly appreciated.
Gene
Any help would be certainly appreciated.
Gene
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