First thing I want to thank all those who helped me (Salmon Slayerr and 99Yam40)troubleshoot my lack of power/bogging down at WOT throttle issue with my 96" 60HP Yamaha.
It was INDEED the carbs. The low speed jets were partially plugged on carbs 1 & 3. And completely plugged on #2. That carb has the enriching fuel pump and electrothermal valve on it. Those passageways were pretty scaled up as well. I say scaled because the stuff that was in there flaked out when dry. All cleaned out, carb rebuild kits, No leaks. Put the muffs on, first 5 second start= nothing (now I sweat) push in the key again when starting (electric choke through the electrothermal valve) crank it and 1 second later up and purring. Smooth as ever. No sputter. No pops. Idle at @800 rpm. Warms up, and idle drops to @400 rpm. Set idle speed screw to 500 rpm (I like it a bit lower than spec (800 rpm's is mfr spec) because it "feels" like it "slams" into gear any higher than that. Out to the lake and needless to say runs better than before it started acting up. 99Yam40, I still only get 2700 rpm's and 35 mph. I have a stainless K-17 prop. But I can get to top speed even faster now. Good fishing day too!!! I know this is long winded, but one more questuion: I want to prevent this scale from building up like that again. I use Stabil RELIGOUSLY. Not Marine Formula, just the regular type. Will marine Formula help prevent this Ethanol scum from building up in the future??
It was INDEED the carbs. The low speed jets were partially plugged on carbs 1 & 3. And completely plugged on #2. That carb has the enriching fuel pump and electrothermal valve on it. Those passageways were pretty scaled up as well. I say scaled because the stuff that was in there flaked out when dry. All cleaned out, carb rebuild kits, No leaks. Put the muffs on, first 5 second start= nothing (now I sweat) push in the key again when starting (electric choke through the electrothermal valve) crank it and 1 second later up and purring. Smooth as ever. No sputter. No pops. Idle at @800 rpm. Warms up, and idle drops to @400 rpm. Set idle speed screw to 500 rpm (I like it a bit lower than spec (800 rpm's is mfr spec) because it "feels" like it "slams" into gear any higher than that. Out to the lake and needless to say runs better than before it started acting up. 99Yam40, I still only get 2700 rpm's and 35 mph. I have a stainless K-17 prop. But I can get to top speed even faster now. Good fishing day too!!! I know this is long winded, but one more questuion: I want to prevent this scale from building up like that again. I use Stabil RELIGOUSLY. Not Marine Formula, just the regular type. Will marine Formula help prevent this Ethanol scum from building up in the future??